Final California 2026 Integrated Report (303(d) List/305(b) Report)

Sonoma County Department of Health Services Beach Watch data for freshwater beaches

Line of Evidence (LOE) for Decision ID 164238, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

357915

Listing Extent:

Pollutant:

Line of Evidence (LOE) for Decision ID 164238, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

352044

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

GeoMean

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

0 of 74 geometric means calculated for year-round data (November-October) and dry weather data (April-October) exceed the objective for E. coli.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Russian River at Camp Rose Beach.

Temporal Representation:

Samples were collected from 5/30/2017 to 8/29/2022.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

QAPP Reference for Beach Watch Program

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation utilized in the RWQCB1 Russian River TMDL .

Line of Evidence (LOE) for Decision ID 164238, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

357915

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

GeoMean

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

0 of 32 geometric means calculated for year-round data (November-October) exceed the objective for E. coli.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Russian River at Del Rio Woods Park (114RR3173).

Temporal Representation:

Samples were collected from 5/26/2015 to 9/19/2016.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

QAPP Reference for Beach Watch Program

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation utilized in the RWQCB1 Russian River TMDL .

Line of Evidence (LOE) for Decision ID 164238, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

357914

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

GeoMean

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

0 of 50 geometric means calculated for year-round data (November-October) exceed the objective for E. coli.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Russian River at Cloverdale River Park (114RR5748).

Temporal Representation:

Samples were collected from 5/28/2013 to 9/19/2016.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

QAPP Reference for Beach Watch Program

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation utilized in the RWQCB1 Russian River TMDL .

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

GeoMean

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

0 of 32 geometric means calculated for year-round data (November-October) exceed the objective for E. coli.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Russian River at Del Rio Woods Park (114RR3173).

Temporal Representation:

Samples were collected from 5/26/2015 to 9/19/2016.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

QAPP Reference for Beach Watch Program

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation utilized in the RWQCB1 Russian River TMDL .

Line of Evidence (LOE) for Decision ID 164238, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

357914

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

GeoMean

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

0 of 50 geometric means calculated for year-round data (November-October) exceed the objective for E. coli.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Line of Evidence (LOE) for Decision ID 164238, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

357913

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

GeoMean

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

0 of 47 geometric means calculated for year-round data (November-October) exceed the objective for E. coli.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation utilized in the RWQCB1 Russian River TMDL .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Russian River at Camp Rose Beach (114RR3119_SWAMP).

Temporal Representation:

Samples were collected from 5/28/2013 to 9/19/2016.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

QAPP Reference for Beach Watch Program

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation utilized in the RWQCB1 Russian River TMDL .

Line of Evidence (LOE) for Decision ID 164238, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

352334

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

STV

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

1 of 3 STVs exceed the E. coli objective.

Data Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Russian River at Cloverdale River Park (114RR5748).

Temporal Representation:

Samples were collected from 5/28/2013 to 9/19/2016.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

QAPP Reference for Beach Watch Program

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation utilized in the RWQCB1 Russian River TMDL .

Line of Evidence (LOE) for Decision ID 164238, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

357913

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

GeoMean

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

0 of 47 geometric means calculated for year-round data (November-October) exceed the objective for E. coli.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Russian River at Camp Rose Beach (114RR3119_SWAMP).

Temporal Representation:

Samples were collected from 5/28/2013 to 9/19/2016.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

QAPP Reference for Beach Watch Program

QAPP Information Reference(s):

Russian River Pathogen Indicator Bacteria TMDL Quality Assurance Project Plan.

Line of Evidence (LOE) for Decision ID 164238, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

352334

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California - Bacteria Provisions and a Water Quality Standards Variance Policy: The bacteria water quality objective for all waters where the salinity is equal to or less than 1 part per thousand (ppth) 95 percent or more of the time during the CALENDAR YEAR is: a STATISTICAL THRESHOLD VALUE (STV) of Escherichia coli of 320 cfu/100 mL not to be exceeded by more than 10 percent of the samples collected in a CALENDAR MONTH, calculated in a static manner.

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Unnamed Tributary at Fitch Mountain Road (114DFMR68).

Temporal Representation:

Samples were collected from 2/19/2013 to 4/4/2013.

Environmental Conditions:

QAPP Information:

Data were collected in accordance with the Russian River Pathogen Indicator Bacteria TMDL QAPP (Version 1.0), Russian River Pathogen Indicator Bacteria TMDL - Supplemental Sampling Plan QAPP (Version 1.0), and/or the Russian River Pathogen Project QAPP.

QAPP Information Reference(s):

QAPP Information Reference(s):

Quality Assurance Project Plan - Russian River Pathogen Project.

QAPP Information Reference(s):

Russian River Pathogen Indicator Bacteria TMDL - Supplemental Sampling Plan Quality Assurance Project Plan.

Line of Evidence (LOE) for Decision ID 164238, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

352327

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

STV

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Four of 4 statistical threshold values (STVs) for year-round data (November-October) and dry weather data (April-October) exceed the E. coli objective.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation utilized in the RWQCB1 Russian River TMDL .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California - Bacteria Provisions and a Water Quality Standards Variance Policy: The bacteria water quality objective for all waters where the salinity is equal to or less than 1 part per thousand (ppth) 95 percent or more of the time during the CALENDAR YEAR is: a STATISTICAL THRESHOLD VALUE (STV) of Escherichia coli of 320 cfu/100 mL not to be exceeded by more than 10 percent of the samples collected in a CALENDAR MONTH, calculated in a static manner.

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from Unnamed Tributary at Fredson Road (114C08FRS).

Temporal Representation:

Samples were collected from 12/3/12 to 4/4/2013.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Russian River Pathogen Indicator Bacteria TMDL Quality Assurance Project Plan.

QAPP Information Reference(s):

Quality Assurance Project Plan - Russian River Pathogen Project.

QAPP Information Reference(s):

Russian River Pathogen Indicator Bacteria TMDL - Supplemental Sampling Plan Quality Assurance Project Plan.

Line of Evidence (LOE) for Decision ID 164238, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

352045

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

GeoMean

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

0 of 77 geometric means calculated for year-round data (November-October) and dry weather data (April-October) exceed the objective for E. coli.

Data Reference:

Sonoma County Department of Health Services Beach Watch data for freshwater beaches

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Russian River at Cloverdale River Park.

Temporal Representation:

Samples were collected from 5/30/2017 to 8/29/2022.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

QAPP Reference for Beach Watch Program

QAPP Information Reference(s):

Sonoma County Department of Health Services Beach Watch data for freshwater beaches

Line of Evidence (LOE) for Decision ID 164238, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

352046

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

GeoMean

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

0 of 74 geometric means calculated from year-round data (November-October) and dry weather data (April-October) exceed the objective for E. coli.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Sonoma County Department of Health Services Beach Watch data for freshwater beaches

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Russian River at Del Rio Woods Beach.

Temporal Representation:

Samples were collected from 5/30/2017 to 8/29/2022.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

QAPP Reference for Beach Watch Program

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation utilized in the RWQCB1 Russian River TMDL .

valign="top" width="67%">Water

Fraction:

STV

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

1 of 3 STVs exceed the E. coli objective.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California - Bacteria Provisions and a Water Quality Standards Variance Policy: The bacteria water quality objective for all waters where the salinity is equal to or less than 1 part per thousand (ppth) 95 percent or more of the time during the CALENDAR YEAR is: a STATISTICAL THRESHOLD VALUE (STV) of Escherichia coli of 320 cfu/100 mL not to be exceeded by more than 10 percent of the samples collected in a CALENDAR MONTH, calculated in a static manner.

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Unnamed Tributary at Fitch Mountain Road (114DFMR68).

Temporal Representation:

Samples were collected from 2/19/2013 to 4/4/2013.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Russian River Pathogen Indicator Bacteria TMDL Quality Assurance Project Plan.

QAPP Information Reference(s):

Quality Assurance Project Plan - Russian River Pathogen Project.

QAPP Information Reference(s):

Russian River Pathogen Indicator Bacteria TMDL - Supplemental Sampling Plan Quality Assurance Project Plan.

Line of Evidence (LOE) for Decision ID 164238, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

352327

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

STV

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Four of 4 statistical threshold values (STVs) for year-round data (November-October) and dry weather data (April-October) exceed the E. coli objective.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation utilized in the RWQCB1 Russian River TMDL .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California - Bacteria Provisions and a Water Quality Standards Variance Policy: The bacteria water quality objective for all waters where the salinity is equal to or less than 1 part per thousand (ppth) 95 percent or more of the time during the CALENDAR YEAR is: a STATISTICAL THRESHOLD VALUE (STV) of Escherichia coli of 320 cfu/100 mL not to be exceeded by more than 10 percent of the samples collected in a CALENDAR MONTH, calculated in a static manner.

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from Unnamed Tributary at Fredson Road (114C08FRS).

Temporal Representation:

Samples were collected from 12/3/12 to 4/4/2013.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Russian River Pathogen Indicator Bacteria TMDL Quality Assurance Project Plan.

QAPP Information Reference(s):

Quality Assurance Project Plan - Russian River Pathogen Project.

QAPP Information Reference(s):

Russian River Pathogen Indicator Bacteria TMDL - Supplemental Sampling Plan Quality Assurance Project Plan.

Line of Evidence (LOE) for Decision ID 164238, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

352045

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

GeoMean

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

0 of 77 geometric means calculated for year-round data (November-October) and dry weather data (April-October) exceed the objective for E. coli.

Data Reference:

Sonoma County Department of Health Services Beach Watch data for freshwater beaches

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Russian River at Cloverdale River Park.

Temporal Representation:

Samples were collected from 5/30/2017 to 8/29/2022.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

QAPP Reference for Beach Watch Program

QAPP Information Reference(s):

Sonoma County Department of Health Services Beach Watch data for freshwater beaches

Line of Evidence (LOE) for Decision ID 164238, Indicator Bacteria	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

352046

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

GeoMean

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

0 of 74 geometric means calculated from year-round data (November-October) and dry weather data (April-October) exceed the objective for E. coli.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Sonoma County Department of Health Services Beach Watch data for freshwater beaches

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Russian River at Del Rio Woods Beach.

Temporal Representation:

Samples were collected from 5/30/2017 to 8/29/2022.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

QAPP Reference for Beach Watch Program

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008


DECISION ID	157614	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:

Aluminum

Final Listing Decision:

Do Not Delist from 303(d) list (TMDL required list)

Last Listing Cycle's Final Listing Decision:

List on 303(d) list (TMDL required list)(2018)

Revision Status

Revised

Sources:

A Source Unknown

TMDL Priority:

Low

Impairment from Pollutant or Pollution:

Pollutant

Regional Board Conclusion:

This pollutant is being considered for removal from the CWA section 303(d) List under section 4.1 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status.

Twenty-eight lines of evidence are available in the administrative record to assess pollutant. BIG SULPHUR CREEK for TOTAL fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323182) and 4 of 7 samples exceed the objective; BIG SULPHUR CREEK for TOTAL fraction of WATER for the MUN beneficial use has two lines of evidence (LOEs 120068, 323205) and 4 of 11 samples exceed the objective; BIG SULPHUR CREEK for TOTAL FRACTION OF WATER for the WARM beneficial use has one line of evidence (LOE 323180) and 4 of 7 samples exceed the objective; RUSSIAN RIVER for the TOTAL fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323199) and 3 of 6 samples exceed the objective; RUSSIAN RIVER for the TOTAL fraction of WATER for the MUN beneficial use has seven lines of evidence (LOEs 41362, 46516, 120070, 123995, 124005, 124006, 323222) and 14 of the 78 samples exceed the objective.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List.

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. BIG SULPHUR CREEK for TOTAL fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323182) and 4 of 7 samples exceed the objective; BIG SULPHUR CREEK for TOTAL fraction of WATER for the MUN beneficial use has two lines of evidence (LOEs 120068, 323205) and 4 of 11 samples exceed the objective; BIG SULPHUR CREEK for TOTAL FRACTION OF WATER for the WARM beneficial use has one line of evidence (LOE 323180) and 4 of 7 samples exceed the objective; RUSSIAN RIVER for the TOTAL fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323199) and 3 of 6 samples exceed the objective; RUSSIAN RIVER for the TOTAL fraction of WATER for the MUN beneficial use has seven lines of evidence (LOEs 41362, 46516, 120070, 123995, 124005, 124006, 323222) and 14 of the 78 samples exceed the objective, and this exceeds the allowable frequency listed in Table 4.1 of the Listing Policy.
4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.

This listing only applies to the mainstem Russian River and Big Sulphur Creek.

***INSUFFICIENT DATA TO APPLY TABLE 4.1 OF THE LISTING POLICY:

BIG SULPHUR CREEK for DISSOLVED fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323206) and 0 of 2 samples exceed the objective.

BIG SULPHUR CREEK for DISSOLVED fraction of WATER for the MUN beneficial use has one line of evidence (LOE 323189) and 0 of 1 sample exceeds the objective.

BIG SULPHUR CREEK for DISSOLVED fraction of WATER for the WARM beneficial use has one line of evidence (LOE 323216) and 0 of 2 samples exceed the objective.

FRANZ CREEK for TOTAL fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323153) and 1 of 1 sample exceeds the objective.

FRANZ CREEK for the TOTAL fraction of WATER for the MUN beneficial use has one line of evidence (LOE 323249) and 1 of 1 sample exceeds the objective.

FRANZ CREEK for the TOTAL fraction of WATER for the WARM beneficial use has one line of evidence (LOE 323186) and 1 of 1 sample exceeds the objective.

RUSSIAN RIVER for the DISSOLVED fraction of WATER for the COLD beneficial use has three lines of evidence (LOEs 323239, 327881, 327885) and 0 of 4 samples exceed the objective.

RUSSIAN RIVER for the DISSOLVED fraction of WATER for the COLD beneficial use has three lines of evidence (LOEs 323231, 327883, 327893) and 0 of 3 samples exceed the objective.

RUSSIAN RIVER for the DISSOLVED fraction of WATER for the WARM beneficial use has three lines of evidence (LOEs 323214, 327891, 327892) and 0 of 4 samples exceed the objective.

***ADD TO LISTING EXTENT - EXCEEDANCES EXCEED ALLOWABLE FREQUENCY IN TABLE 4.1 OF THE LISTING POLICY:

BIG SULPHUR CREEK for TOTAL fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323182) and 4 of 7 samples exceed the objective.

BIG SULPHUR CREEK for TOTAL fraction of WATER for the MUN beneficial use has two lines of evidence (LOEs 120068, 323205) and 4 of 11 samples exceed the objective.

BIG SULPHUR CREEK for TOTAL FRACTION OF WATER for the WARM beneficial use has one line of evidence (LOE 323180) and 4 of 7 samples exceed the objective.

***DO NOT DELIST - EXCEEDANCES EXCEED ALLOWABLE FREUQUENCY IN TABLE 4.1 OF THE LISTING POLICY:

RUSSIAN RIVER for the TOTAL fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323199) and 3 of 6 samples exceed the objective.

RUSSIAN RIVER for the TOTAL fraction of WATER for the MUN beneficial use has seven lines of evidence (LOEs 41362, 46516, 120070, 123995, 124005, 124006, 323222) and 14 of the 78 samples exceed the objective.

RUSSIAN RIVER for the TOTAL fraction of WATER for the WARM beneficial use has one line of evidence (LOE 323187) and 3 of 6 samples exceed the objective.

This listing only applies to the mainstem Russian Rive


DECISION ID	157614	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Aluminum
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the CWA section 303(d) List under section 4.1 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Twenty-eight lines of evidence are available in the administrative record to assess pollutant. BIG SULPHUR CREEK for TOTAL fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323182) and 4 of 7 samples exceed the objective; BIG SULPHUR CREEK for TOTAL fraction of WATER for the MUN beneficial use has two lines of evidence (LOEs 120068, 323205) and 4 of 11 samples exceed the objective; BIG SULPHUR CREEK for TOTAL FRACTION OF WATER for the WARM beneficial use has one line of evidence (LOE 323180) and 4 of 7 samples exceed the objective; RUSSIAN RIVER for the TOTAL fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323199) and 3 of 6 samples exceed the objective; RUSSIAN RIVER for the TOTAL fraction of WATER for the MUN beneficial use has seven lines of evidence (LOEs 41362, 46516, 120070, 123995, 124005, 124006, 323222) and 14 of the 78 samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. BIG SULPHUR CREEK for TOTAL fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323182) and 4 of 7 samples exceed the objective; BIG SULPHUR CREEK for TOTAL fraction of WATER for the MUN beneficial use has two lines of evidence (LOEs 120068, 323205) and 4 of 11 samples exceed the objective; BIG SULPHUR CREEK for TOTAL FRACTION OF WATER for the WARM beneficial use has one line of evidence (LOE 323180) and 4 of 7 samples exceed the objective; RUSSIAN RIVER for the TOTAL fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323199) and 3 of 6 samples exceed the objective; RUSSIAN RIVER for the TOTAL fraction of WATER for the MUN beneficial use has seven lines of evidence (LOEs 41362, 46516, 120070, 123995, 124005, 124006, 323222) and 14 of the 78 samples exceed the objective, and this exceeds the allowable frequency listed in Table 4.1 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met. This listing only applies to the mainstem Russian River and Big Sulphur Creek. *INSUFFICIENT DATA TO APPLY TABLE 4.1 OF THE LISTING POLICY: BIG SULPHUR CREEK for DISSOLVED fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323206) and 0 of 2 samples exceed the objective. BIG SULPHUR CREEK for DISSOLVED fraction of WATER for the MUN beneficial use has one line of evidence (LOE 323189) and 0 of 1 sample exceeds the objective. BIG SULPHUR CREEK for DISSOLVED fraction of WATER for the WARM beneficial use has one line of evidence (LOE 323216) and 0 of 2 samples exceed the objective. FRANZ CREEK for TOTAL fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323153) and 1 of 1 sample exceeds the objective. FRANZ CREEK for the TOTAL fraction of WATER for the MUN beneficial use has one line of evidence (LOE 323249) and 1 of 1 sample exceeds the objective. FRANZ CREEK for the TOTAL fraction of WATER for the WARM beneficial use has one line of evidence (LOE 323186) and 1 of 1 sample exceeds the objective. RUSSIAN RIVER for the DISSOLVED fraction of WATER for the COLD beneficial use has three lines of evidence (LOEs 323239, 327881, 327885) and 0 of 4 samples exceed the objective. RUSSIAN RIVER for the DISSOLVED fraction of WATER for the COLD beneficial use has three lines of evidence (LOEs 323231, 327883, 327893) and 0 of 3 samples exceed the objective. RUSSIAN RIVER for the DISSOLVED fraction of WATER for the WARM beneficial use has three lines of evidence (LOEs 323214, 327891, 327892) and 0 of 4 samples exceed the objective. ADD TO LISTING EXTENT - EXCEEDANCES EXCEED ALLOWABLE FREQUENCY IN TABLE 4.1 OF THE LISTING POLICY: BIG SULPHUR CREEK for TOTAL fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323182) and 4 of 7 samples exceed the objective. BIG SULPHUR CREEK for TOTAL fraction of WATER for the MUN beneficial use has two lines of evidence (LOEs 120068, 323205) and 4 of 11 samples exceed the objective. BIG SULPHUR CREEK for TOTAL FRACTION OF WATER for the WARM beneficial use has one line of evidence (LOE 323180) and 4 of 7 samples exceed the objective. **DO NOT DELIST - EXCEEDANCES EXCEED ALLOWABLE FREUQUENCY IN TABLE 4.1 OF THE LISTING POLICY: RUSSIAN RIVER for the TOTAL fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323199) and 3 of 6 samples exceed the objective. RUSSIAN RIVER for the TOTAL fraction of WATER for the MUN beneficial use has seven lines of evidence (LOEs 41362, 46516, 120070, 123995, 124005, 124006, 323222) and 14 of the 78 samples exceed the objective. RUSSIAN RIVER for the TOTAL fraction of WATER for the WARM beneficial use has one line of evidence (LOE 323187) and 3 of 6 samples exceed the objective. This listing only applies to the mainstem Russian River.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:	*INSUFFICIENT DATA TO APPLY TABLE 4.1 OF THE LISTING POLICY: BIG SULPHUR CREEK for DISSOLVED fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323206) and 0 of 2 samples exceed the objective. BIG SULPHUR CREEK for DISSOLVED fraction of WATER for the MUN beneficial use has one line of evidence (LOE 323189) and 0 of 1 sample exceeds the objective. BIG SULPHUR CREEK for DISSOLVED fraction of WATER for the WARM beneficial use has one line of evidence (LOE 323216) and 0 of 2 samples exceed the objective. FRANZ CREEK for TOTAL fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323153) and 1 of 1 sample exceeds the objective. FRANZ CREEK for the TOTAL fraction of WATER for the MUN beneficial use has one line of evidence (LOE 323249) and 1 of 1 sample exceeds the objective. FRANZ CREEK for the TOTAL fraction of WATER for the WARM beneficial use has one line of evidence (LOE 323186) and 1 of 1 sample exceeds the objective. RUSSIAN RIVER for the DISSOLVED fraction of WATER for the COLD beneficial use has three lines of evidence (LOEs 323239, 327881, 327885) and 0 of 4 samples exceed the objective. RUSSIAN RIVER for the DISSOLVED fraction of WATER for the COLD beneficial use has three lines of evidence (LOEs 323231, 327883, 327893) and 0 of 3 samples exceed the objective. RUSSIAN RIVER for the DISSOLVED fraction of WATER for the WARM beneficial use has three lines of evidence (LOEs 323214, 327891, 327892) and 0 of 4 samples exceed the objective. ADD TO LISTING EXTENT - EXCEEDANCES EXCEED ALLOWABLE FREQUENCY IN TABLE 4.1 OF THE LISTING POLICY: BIG SULPHUR CREEK for TOTAL fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323182) and 4 of 7 samples exceed the objective. BIG SULPHUR CREEK for TOTAL fraction of WATER for the MUN beneficial use has two lines of evidence (LOEs 120068, 323205) and 4 of 11 samples exceed the objective. BIG SULPHUR CREEK for TOTAL FRACTION OF WATER for the WARM beneficial use has one line of evidence (LOE 323180) and 4 of 7 samples exceed the objective. **DO NOT DELIST - EXCEEDANCES EXCEED ALLOWABLE FREUQUENCY IN TABLE 4.1 OF THE LISTING POLICY: RUSSIAN RIVER for the TOTAL fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323199) and 3 of 6 samples exceed the objective. RUSSIAN RIVER for the TOTAL fraction of WATER for the MUN beneficial use has seven lines of evidence (LOEs 41362, 46516, 120070, 123995, 124005, 124006, 323222) and 14 of the 78 samples exceed the objective. RUSSIAN RIVER for the TOTAL fraction of WATER for the WARM beneficial use has one line of evidence (LOE 323187) and 3 of 6 samples exceed the objective. This listing only applies to the mainstem Russian River.

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:	This listing only applies to the mainstem Russian River and Big Sulphur Creek.

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124006

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 5 of 23 samples exceed the criterion for Aluminum, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.

Objectivr.

Regional Board Decision Recommendation:

After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

***INSUFFICIENT DATA TO APPLY TABLE 4.1 OF THE LISTING POLICY:

BIG SULPHUR CREEK for DISSOLVED fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323206) and 0 of 2 samples exceed the objective.

BIG SULPHUR CREEK for DISSOLVED fraction of WATER for the MUN beneficial use has one line of evidence (LOE 323189) and 0 of 1 sample exceeds the objective.

BIG SULPHUR CREEK for DISSOLVED fraction of WATER for the WARM beneficial use has one line of evidence (LOE 323216) and 0 of 2 samples exceed the objective.

FRANZ CREEK for TOTAL fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323153) and 1 of 1 sample exceeds the objective.

FRANZ CREEK for the TOTAL fraction of WATER for the MUN beneficial use has one line of evidence (LOE 323249) and 1 of 1 sample exceeds the objective.

FRANZ CREEK for the TOTAL fraction of WATER for the WARM beneficial use has one line of evidence (LOE 323186) and 1 of 1 sample exceeds the objective.

RUSSIAN RIVER for the DISSOLVED fraction of WATER for the COLD beneficial use has three lines of evidence (LOEs 323239, 327881, 327885) and 0 of 4 samples exceed the objective.

RUSSIAN RIVER for the DISSOLVED fraction of WATER for the COLD beneficial use has three lines of evidence (LOEs 323231, 327883, 327893) and 0 of 3 samples exceed the objective.

RUSSIAN RIVER for the DISSOLVED fraction of WATER for the WARM beneficial use has three lines of evidence (LOEs 323214, 327891, 327892) and 0 of 4 samples exceed the objective.

***ADD TO LISTING EXTENT - EXCEEDANCES EXCEED ALLOWABLE FREQUENCY IN TABLE 4.1 OF THE LISTING POLICY:

BIG SULPHUR CREEK for TOTAL fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323182) and 4 of 7 samples exceed the objective.

BIG SULPHUR CREEK for TOTAL fraction of WATER for the MUN beneficial use has two lines of evidence (LOEs 120068, 323205) and 4 of 11 samples exceed the objective.

BIG SULPHUR CREEK for TOTAL FRACTION OF WATER for the WARM beneficial use has one line of evidence (LOE 323180) and 4 of 7 samples exceed the objective.

***DO NOT DELIST - EXCEEDANCES EXCEED ALLOWABLE FREUQUENCY IN TABLE 4.1 OF THE LISTING POLICY:

RUSSIAN RIVER for the TOTAL fraction of WATER for the COLD beneficial use has one line of evidence (LOE 323199) and 3 of 6 samples exceed the objective.

RUSSIAN RIVER for the TOTAL fraction of WATER for the MUN beneficial use has seven lines of evidence (LOEs 41362, 46516, 120070, 123995, 124005, 124006, 323222) and 14 of the 78 samples exceed the objective.

RUSSIAN RIVER for the TOTAL fraction of WATER for the WARM beneficial use has one line of evidence (LOE 323187) and 3 of 6 samples exceed the objective.

This listing only applies to the mainstem Russian River.

State Board Decision Recommendation:

After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

This listing only applies to the mainstem Russian River and Big Sulphur Creek.

PHYSICAL/CHEMICAL MONITORINGeline Reference:5

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124006

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/21/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323180

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 4 of 7 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The aluminum criterion for the protection of aquatic life, is pH, total hardness, and dissolved organic carbon (DOC) dependent. When total hardness or DOC data were not available, default values based on the level III ecoregions developed by U.S EPA were substituted (EPA, 2018). When pH data were not available, the median pH value for the ecoregion, a pH value from a comparable waterbody, or a pH value from a local study in the same waterbody was used as a comparable surrogate.

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/21/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323180

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323205

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 4 of 5 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Mcolspan="2">

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323249

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323205

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 4 of 5 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323249

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323216

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323216

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323214

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323231

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323214

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323231

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323189

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323199

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 3 of 6 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323182

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323189

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323199

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 3 of 6 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323182

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323153

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323206

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323153

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guidtr>

LOE ID:

323239

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323187

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 3 of 6 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323206

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323239

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323187

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 3 of 6 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323186

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAM

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323186

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323222

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 4 of 5 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120070

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323222

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 4 of 5 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120070

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124005

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 2 samples exceed the criterion for Aluminum, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Comminski Station - 114RRCOMM]

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental water quality standard for Aluminum.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124005

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Comminski Station - 114RRCOMM]

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41362

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 4 samples exceed the criterion for Aluminum.

Data Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123995

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41362

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123995

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 5 samples exceed the criterion for Aluminum, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

46516

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

One of the 33 aluminum samples collected from the mainstem Russian River exceed the objective. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008). This LOE and LOE 46517 contain data originally evaluated in LOE 25385, which included data from a site that is not in this water body. The data from LOE 25385 have been split into two LOEs, with data now evaluated under the correct water body.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): The Maximum Contaminant Level for aluminum is 1.0 mg/l (1,000 ug/L).

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 5 samples exceed the criterion for Aluminum, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

46516

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): The Maximum Contaminant Level for aluminum is 1.0 mg/l (1,000 ug/L).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the mainstem Russian River at 5 locations as follows: (1) at Comminski Station (SWAMP Station ID 114RRCOMM), (2) at Cloverdale (SWAMP Station ID 114RRCLO1), (3) downstream of the Cloverdale Water Treatment Plant (SWAMP Station ID 114CLOSTP), (4) at Geyserville (SWAMP Station ID 114RRGEYS) and (5) at Alexander Valley Bridge (SWAMP Station ID 114RRALEX). Samples were collected from well-mixed flows in glides or riffles.

Temporal Representation:

At the Comminski Station, Geyserville, and Alexander Valley Bridge sites, samples were collected over 2 site visits at each site during June 2001. At the Cloverdale site samples were collected over 22 site visits from June 2001 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120068

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Aluminum.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

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Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120068

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Aluminum.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327893

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327881

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Line of Evidence (LOE) for Decision ID 157614, Aluminum

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327893

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327881

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327885

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327885

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327883

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327892

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327891

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

>QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327883

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327892

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157614, Aluminum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327891

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle


DECISION ID	157551	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Diazinon
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the CWA section 303(d) List under section4.1 of the Listing Policy. Under section 4.1 a single line of evidence is necessary to assess listing status. Eleven lines of evidence are available in the administrative record to assess this pollutant. Two of two samples from Foss Creek exceed the objective for the protection of the COLD beneficial use. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Two of two samples from Foss Creek exceed the objective for the protection of the COLD beneficial use and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, if the beneficial use is being supported as a minimum of 28 samples is needed to determine if a beneficial use is fully supported using table 4.1. 4. Pursuant to Section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Foss Creek is not in Russian River HU, Middle Russian River HA, Geyserville HSA (CAR1142503219990615082353) as identified in the Integrated Report. Foss Creek is in Russian River HU, Middle Russian River HA, Warm Springs HSA (CAR1142403419990615103858). The extent will no longer be included as a "listed" extent. For the COLD beneficial use in WATER: BIG SULPHUR CREEK has one line of evidence (LOE 116277) and 0 of 4 samples exceed the objective, which is insufficient data to apply Table 4.1 of the Listing Policy. FOSS CREEK has one line of evidence (LOE 6216) and 2 of 2 samples exceed the objective, which exceeds the allowable frequency of Table 4.1 of the Listing Policy. RUSSIAN RIVER has four lines of evidence (LOEs 41277, 116280, 116282, 324526) and 0 of 9 samples exceed the objective, which is insufficient data to apply Table 4.1 of the Listing Policy.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:	For the COLD beneficial use in WATER: BIG SULPHUR CREEK has one line of evidence (LOE 116277) and 0 of 4 samples exceed the objective, which is insufficient data to apply Table 4.1 of the Listing Policy. FOSS CREEK has one line of evidence (LOE 6216) and 2 of 2 samples exceed the objective, which exceeds the allowable frequency of Table 4.1 of the Listing Policy. RUSSIAN RIVER has four lines of evidence (LOEs 41277, 116280, 116282, 324526) and 0 of 9 samples exceed the objective, which is insufficient data to apply Table 4.1 of the Listing Policy.

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:	This listing applies only to Foss Creek which lies within the "Russian River HU, Middle Russian River HA, Geyserville HSA" waterbody.

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324526

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

DECISION ID

157551

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Diazinon
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the CWA section 303(d) List under section4.1 of the Listing Policy. Under section 4.1 a single line of evidence is necessary to assess listing status. Eleven lines of evidence are available in the administrative record to assess this pollutant. Two of two samples from Foss Creek exceed the objective for the protection of the COLD beneficial use. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Two of two samples from Foss Creek exceed the objective for the protection of the COLD beneficial use and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, if the beneficial use is being supported as a minimum of 28 samples is needed to determine if a beneficial use is fully supported using table 4.1. 4. Pursuant to Section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Foss Creek is not in Russian River HU, Middle Russian River HA, Geyserville HSA (CAR1142503219990615082353) as identified in the Integrated Report. Foss Creek is in Russian River HU, Middle Russian River HA, Warm Springs HSA (CAR1142403419990615103858). The extent will no longer be included as a "listed" extent. For the COLD beneficial use in WATER: BIG SULPHUR CREEK has one line of evidence (LOE 116277) and 0 of 4 samples exceed the objective, which is insufficient data to apply Table 4.1 of the Listing Policy. FOSS CREEK has one line of evidence (LOE 6216) and 2 of 2 samples exceed the objective, which exceeds the allowable frequency of Table 4.1 of the Listing Policy. RUSSIAN RIVER has four lines of evidence (LOEs 41277, 116280, 116282, 324526) and 0 of 9 samples exceed the objective, which is insufficient data to apply Table 4.1 of the Listing Policy.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:	For the COLD beneficial use in WATER: BIG SULPHUR CREEK has one line of evidence (LOE 116277) and 0 of 4 samples exceed the objective, which is insufficient data to apply Table 4.1 of the Listing Policy. FOSS CREEK has one line of evidence (LOE 6216) and 2 of 2 samples exceed the objective, which exceeds the allowable frequency of Table 4.1 of the Listing Policy. RUSSIAN RIVER has four lines of evidence (LOEs 41277, 116280, 116282, 324526) and 0 of 9 samples exceed the objective, which is insufficient data to apply Table 4.1 of the Listing Policy.

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:	This listing applies only to Foss Creek which lies within the "Russian River HU, Middle Russian River HA, Geyserville HSA" waterbody.

Temporal Representation: Number of Samples:

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324526

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Diazinon.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

6216

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Migration | Fish Spawning | Preservation of Rare & Endangered Species | Warm Freshwater Habitat | Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

All 2 of the 2 diazinon samples collected from Foss Creek exceed the evaluation guideline. Concentrations range from 0.133 to 0.707 ug/l. The samples were collected as part of the Russian River First Flush sampling event. Data are summarized by Katznelson et al. (2003).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

&nbstd>

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Diazinon.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

6216

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Migration | Fish Spawning | Preservation of Rare & Endangered Species | Warm Freshwater Habitat | Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Per the National Recommended Water Quality Criteria (USEPA 2006): The 1-hour average maximum concentration criterion for freshwater aquatic life protection is 0.08 ug/l.

Guideline Reference:

Spatial Representation:

The samples were collected from 2 sites in Foss Creek as follows: (1) in Foss Creek in downtown Healdsburg, and (2) in Upper Foss Creek.

Temporal Representation:

The samples were collected on November 7, 2002. At each site, 3 instantaneous grab samples were collected over half hour increments. The data are averaged for each site.

Environmental Conditions:

Samples were collected during the first runoff event of the rainy season.

QAPP Information:

Samples were collected in accordance with the study plan and quality control procedures described by Katznelson et al. (2003).

QAPP Information Reference(s):

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324528

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Diazinon.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.10 ug/L (4 day average)(Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Guideline Reference:

Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game (with minor corrections to significant figures as described in Beaulaurier et al., 2005).

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41277

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Diazinon.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

As stated in CDFG documents from Siepmann and Finlayson, the 4-day freshwater continuous criterion concentration for diazinon is 0.10 µg/L.

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116280

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samplep;

Evaluation Guideline:

Per the National Recommended Water Quality Criteria (USEPA 2006): The 1-hour average maximum concentration criterion for freshwater aquatic life protection is 0.08 ug/l.

Guideline Reference:

Spatial Representation:

The samples were collected from 2 sites in Foss Creek as follows: (1) in Foss Creek in downtown Healdsburg, and (2) in Upper Foss Creek.

Temporal Representation:

The samples were collected on November 7, 2002. At each site, 3 instantaneous grab samples were collected over half hour increments. The data are averaged for each site.

Environmental Conditions:

Samples were collected during the first runoff event of the rainy season.

QAPP Information:

Samples were collected in accordance with the study plan and quality control procedures described by Katznelson et al. (2003).

QAPP Information Reference(s):

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324528

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Diazinon.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.10 ug/L (4 day average)(Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41277

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

As stated in CDFG documents from Siepmann and Finlayson, the 4-day freshwater continuous criterion concentration for diazinon is 0.10 µg/L.

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116280

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Diazinon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116277

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Diazinon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Referes exceeded the water quality standard for Diazinon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116277

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Diazinon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43585

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Diazinon.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for diazinon is the median lethal concentration (LC50) of 11 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 11 ug/g is the geometric mean of LC50 values for diazinon from Ding et al. (2011).

Guideline Reference:

Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43584

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Infornce(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43585

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43584

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324524

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Diazinon.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Based on USEPA reference dose (RfD) as a drinking water level, the drinking water health advisory level for Diazinon is 1 ug/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324524

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Diazinon.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Based on USEPA reference dose (RfD) as a drinking water level, the drinking water health advisory level for Diazinon is 1 ug/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41283

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116281

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41283

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116281

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Diazinon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Based on USEPA reference dose (RfD) as a drinking water level, the drinking water health advisory level for Diazinon is 1.4 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116279

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Diazinon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Based on USEPA reference dose (RfD) as a drinking water level, the drinking water health advisory level for Diazinon is 1.4 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Diazinon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Based on USEPA reference dose (RfD) as a drinking water level, the drinking water health advisory level for Diazinon is 1.4 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116279

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Diazinon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Based on USEPA reference dose (RfD) as a drinking water level, the drinking water health advisory level for Diazinon is 1.4 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116283

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Diazinon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Based on USEPA reference dose (RfD) as a drinking water level, the drinking water health advisory level for Diazinon is 1.4 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116282

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Diazinon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

tr> Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116283 Pollutant: Diazinon LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Diazinon. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Based on USEPA reference dose (RfD) as a drinking water level, the drinking water health advisory level for Diazinon is 1.4 µg/L. Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157551, Diazinon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116282 Pollutant: Diazinon LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Diazinon. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004). Guideline Reference: Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	163057	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Specific Conductivity
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Thirty-two lines of evidence are available in the administrative record to assess this pollutant. Twenty-four of 37 Russian River samples exceed the Cold Freshwater Habitat beneficial use guideline and 10 of 17 Russian River samples exceed the Municipal & Domestic Supply beneficial use guideline. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Twenty-four of 37 Russian River samples exceed the Cold Freshwater Habitat beneficial use guideline and 10 of 17 Russian River samples exceed the Municipal & Domestic Supply beneficial use guideline, and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. This listing applies to the mainstem Russian River. *COLD FRESHWATER HABITAT BENEFICIAL USE: BIG SULPHUR CREEK has two lines of evidence (LOEs 317914, 318720) and 2 of 2 samples exceed the guideline. FRANZ CREEK has one line of evidence (LOE 318076) and 0 of 1 sample exceeds the guideline. LYTTON CREEK has one line of evidence (LOE 318260) and 1 of 1 sample exceeds the guideline. MAACAMA CREEK has one line of evidence (LOE 318884) and 0 of 1 sample exceeds the guideline. RUSSIAN RIVER has thirteen lines of evidence (LOEs 318454, 318471, 318474, 318478, 318481, 318483, 318485, 318503, 318948, 318950, 318960, 318964, 318980) and 24 of 37 samples exceed the guideline, which exceeds the allowable frequency in Table 3.2 of the Listing Policy. *MUNICIPAL & DOMESTIC SUPPLY BENEFICIAL USE: FOSS CREEK has one line of evidence (LOE 46816) and 0 of 2 samples exceed the guideline. RUSSIAN RIVER has thirteen lines of evidence (LOEs 34439, 46513, 100843, 100844, 100845, 100846, 100847, 100850, 100851, 100852, 100853, 100885, 100888) and 10 of 27 samples exceed the guideline, which exceeds the allowable frequency in Table 3.2 of the Listing Policy. This listing applies to the mainstem Russian River.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:	*COLD FRESHWATER HABITAT BENEFICIAL USE: BIG SULPHUR CREEK has two lines of evidence (LOEs 317914, 318720) and 2 of 2 samples exceed the guideline. FRANZ CREEK has one line of evidence (LOE 318076) and 0 of 1 sample exceeds the guideline. LYTTON CREEK has one line of evidence (LOE 318260) and 1 of 1 sample exceeds the guideline. MAACAMA CREEK has one line of evidence (LOE 318884) and 0 of 1 sample exceeds the guideline. RUSSIAN RIVER has thirteen lines of evidence (LOEs 318454, 318471, 318474, 318478, 318481, 318483, 318485, 318503, 318948, 318950, 318960, 318964, 318980) and 24 of 37 samples exceed the guideline, which exceeds the allowable frequency in Table 3.2 of the Listing Policy. *MUNICIPAL & DOMESTIC SUPPLY BENEFICIAL USE: FOSS CREEK has one line of evidence (LOE 46816) and 0 of 2 samples exceed the guideline. RUSSIAN RIVER has thirteen lines of evidence (LOEs 34439, 46513, 100843, 100844, 100845, 100846, 100847, 100850, 100851, 100852, 100853, 100885, 100888) and 10 of 27 samples exceed the guideline, which exceeds the allowable frequency in Table 3.2 of the Listing Policy. This listing applies to the mainstem Russian River.

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:	This listing applies to the mainstem Russian River.

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity

DECISION ID	163057	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Specific Conductivity
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Thirty-two lines of evidence are available in the administrative record to assess this pollutant. Twenty-four of 37 Russian River samples exceed the Cold Freshwater Habitat beneficial use guideline and 10 of 17 Russian River samples exceed the Municipal & Domestic Supply beneficial use guideline. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Twenty-four of 37 Russian River samples exceed the Cold Freshwater Habitat beneficial use guideline and 10 of 17 Russian River samples exceed the Municipal & Domestic Supply beneficial use guideline, and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. This listing applies to the mainstem Russian River. *COLD FRESHWATER HABITAT BENEFICIAL USE: BIG SULPHUR CREEK has two lines of evidence (LOEs 317914, 318720) and 2 of 2 samples exceed the guideline. FRANZ CREEK has one line of evidence (LOE 318076) and 0 of 1 sample exceeds the guideline. LYTTON CREEK has one line of evidence (LOE 318260) and 1 of 1 sample exceeds the guideline. MAACAMA CREEK has one line of evidence (LOE 318884) and 0 of 1 sample exceeds the guideline. RUSSIAN RIVER has thirteen lines of evidence (LOEs 318454, 318471, 318474, 318478, 318481, 318483, 318485, 318503, 318948, 318950, 318960, 318964, 318980) and 24 of 37 samples exceed the guideline, which exceeds the allowable frequency in Table 3.2 of the Listing Policy. *MUNICIPAL & DOMESTIC SUPPLY BENEFICIAL USE: FOSS CREEK has one line of evidence (LOE 46816) and 0 of 2 samples exceed the guideline. RUSSIAN RIVER has thirteen lines of evidence (LOEs 34439, 46513, 100843, 100844, 100845, 100846, 100847, 100850, 100851, 100852, 100853, 100885, 100888) and 10 of 27 samples exceed the guideline, which exceeds the allowable frequency in Table 3.2 of the Listing Policy. This listing applies to the mainstem Russian River.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:	*COLD FRESHWATER HABITAT BENEFICIAL USE: BIG SULPHUR CREEK has two lines of evidence (LOEs 317914, 318720) and 2 of 2 samples exceed the guideline. FRANZ CREEK has one line of evidence (LOE 318076) and 0 of 1 sample exceeds the guideline. LYTTON CREEK has one line of evidence (LOE 318260) and 1 of 1 sample exceeds the guideline. MAACAMA CREEK has one line of evidence (LOE 318884) and 0 of 1 sample exceeds the guideline. RUSSIAN RIVER has thirteen lines of evidence (LOEs 318454, 318471, 318474, 318478, 318481, 318483, 318485, 318503, 318948, 318950, 318960, 318964, 318980) and 24 of 37 samples exceed the guideline, which exceeds the allowable frequency in Table 3.2 of the Listing Policy. *MUNICIPAL & DOMESTIC SUPPLY BENEFICIAL USE: FOSS CREEK has one line of evidence (LOE 46816) and 0 of 2 samples exceed the guideline. RUSSIAN RIVER has thirteen lines of evidence (LOEs 34439, 46513, 100843, 100844, 100845, 100846, 100847, 100850, 100851, 100852, 100853, 100885, 100888) and 10 of 27 samples exceed the guideline, which exceeds the allowable frequency in Table 3.2 of the Listing Policy. This listing applies to the mainstem Russian River.

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:	This listing applies to the mainstem Russian River.

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

34439

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Zero of the 2 calendar years of data exceeded the objective.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The site specific objective for the Russian River upstream of the Laguna de Santa Rosa is a 90% upper limit of 320 uS. Therefore, 90% of the values in a calendar year must be lower than this limit. In addition the site specific objective of 50% upper limit of 250 uS which represents the 50 percentile values of the monthly means for a calendar year applies to this water body. Therefore, 50% or more of the monthly means in a calendar year must be less than or equal to an upper limit.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Russian River at Crocker Road station (114RR5652).

Temporal Representation:

Samples were collected on the following dates: 11/26/2007 3/3/2008 4/7/2008 7/14/2008

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008).

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100847

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality standard for specific conductance. Data range from 260 - 319.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: Specific conductivity shall conform to Table 3-1 which states that water quality objective for specific conductivity has an 90% upper limit of 320 micromhos and a 50% upper limit of 250 micromhos.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR3119_SWAMP).

Temporal Representation:

The samples were collected between the dates 05/19/2011 - 10/04/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

46513

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Three of the calendar years data for sites on the mainstem Russian River exceeded the specific conductivity objective. The number of samples and exceedances for each site are as follows: (1) 0 of 2 exceedances for the 2 years calendar years of data for the Cominski Station site; (2) 1 of 6 exceedances for the 6 years of data from the Crocker Road site; (3) 1 of 2 exceedances for the 2 years of data from the site downstream of the Cloverdale Wastewater treatment plant; (4) 0 of 1 exceedances for the one year of data from the Highway 128 site; and (5) 1 of 1 exceedance from the one year of data from the Alexander Valley Bridge site. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008). This LOE and LOE 46512 contain data originally evaluated in LOE 21323, which included data from a site that is not in this water body and incorrectly assessed each individual sample against the objective, instead of evaluating the calendar years worth of data for each site against the objective as is appropriate. The data from LOE 21323 have been split into two LOEs, with data now evaluated under the correct water body and on a calendar year basis.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): The 90% upper limit specific conductance objective at 77 F is 320 micromhos (or mS/cm2). The 50% upper limit specific conductance objective at 77 F is 250 micromhos (or mS/cm2). The 90% and 50% upper limits represent the 90/50 percentile values for a calendar year. 90% or 50% or more of the values must be less than or equal to the upper limit.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the mainstem Russian River at 5 locations as follows: (1) at Comminski Station (SWAMP Station ID 114RRCOMM), (2) at Crocker Road in Cloverdale (SWAMP Station ID 114RRCLO1), (3) downstream of the Cloverdale Water Treatment Plant (SWAMP Station ID 114CLOSTP), (4) at Highway 128 in Geyserville (SWAMP Station ID 114RRGEYS) and (5) at Alexander Valley Bridge (SWAMP Station ID 114RRALEX). Samples were collected from well-mixed flows in glides or riffles.

Temporal Represnd-color:#CCCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: right; PADDING-TOP: 3px; font-smooth: always">Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

34439

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Zero of the 2 calendar years of data exceeded the objective.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Russian River at Crocker Road station (114RR5652).

Temporal Representation:

Samples were collected on the following dates: 11/26/2007 3/3/2008 4/7/2008 7/14/2008

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008).

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100847

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR3119_SWAMP).

Temporal Representation:

The samples were collected between the dates 05/19/2011 - 10/04/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

46513

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

At the Comminski Station, Crocker Road, and Alexander Valley Bridge sites, samples were collected over 2 site visits at each site during June 2001. At the Highway 128 site samples were collected over 22 site visits from June 2001 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100885

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for specific conductance. Data range from 116 micromhos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114PS0229).

Temporal Representation:

The samples were collected between the dates 06/04/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100852

Pollentation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100885

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114PS0229).

Temporal Representation:

The samples were collected between the dates 06/04/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100852

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 1 of 1 sample exceeded the water quality standard for specific conductance. Data range from 221 - 267.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR2678).

Temporal Representation:

The samples were collected between the dates 06/29/2011 - 11/29/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100888

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR2678).

Temporal Representation:

The samples were collected between the dates 06/29/2011 - 11/29/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100888

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114CR0903).

Temporal Representation:

The samples were collected between the dates 08/26/2013 - 09/25/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100845

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4751_SWAMP).

Temporal Representation:

The samples were collected between the dates 05/26/2011 - 10/06/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114CR0903).

Temporal Representation:

The samples were collected between the dates 08/26/2013 - 09/25/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100845

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4751_SWAMP).

Temporal Representation:

The samples were collected between the dates 05/26/2011 - 10/06/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100846

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 2 of 2 samples exceeded the water quality standard for specific conductance. Data range from 250 - 407.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP).

Temporal Representation:

The samples were collected between the dates 05/19/2011 - 10/4/2011 and 02/03/2014.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318503

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for SWAMP RWB1 Monitoring and determined that calendar year 2011 exceeds the 50% upper limit, so that 1 of 1 sample exceeds the water quality objective.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Crit" width="67%">100846

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP).

Temporal Representation:

The samples were collected between the dates 05/19/2011 - 10/4/2011 and 02/03/2014.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318503

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Highway 128; station code: 114RR4751.

Temporal Representation:

These samples were collected from 5/26/2011-10/6/2011.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318076

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for parent project SWAMP RWB1 Monitoring and determined that calendar year 2019 does not exceed either the 90% or 50% upper limit, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Franz Creek at Chalk Hill Road; station code: 114FR0102.

Temporal Representation:

This sample was collected on 1/6/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318950

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Highway 128; station code: 114RR4751.

Temporal Representation:

These samples were collected from 5/26/2011-10/6/2011.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318076

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Franz Creek at Chalk Hill Road; station code: 114FR0102.

Temporal Representation:

This sample was collected on 1/6/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318950

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data from USGS California Water Science Center and determined that calendar years 2011, 2014, 2016, and 2017 exceed the 50% upper limit and calendar year 2015 exceeds both the 90% and 50% upper limit, so that 5 of 5 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: RUSSIAN R A DIGGER BEND NR HEALDSBURG CA; station code: USGS-11463980.

Temporal Representation:

These samples were collected from 7/26/2011-11/6/2017.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318960

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for USGS California Water Science Center and determined that calendar year 2015 exceeds the 50% upper limit and calendar year 2016 does not exceed either the 90% or 50% upper limit, so that 1 of 2 samples exceed the water quality objective.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

gn="top" width="33%">Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: RUSSIAN R A DIGGER BEND NR HEALDSBURG CA; station code: USGS-11463980.

Temporal Representation:

These samples were collected from 7/26/2011-11/6/2017.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318960

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: RUSSIAN R A JIMTOWN CA; USGS-11463682.

Temporal Representation:

These samples were collected from 8/13/2015-10/28/2016.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318964

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for USGS California Water Science Center and determined that calendar year 2017 does not exceed the 90% or 50% upper limit and calendar year 2018 exceeds the 50% upper limit, so that 1 of 2 samples exceed the water quality objective.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: RUSSIAN R A PRESTON CA; station code: USGS-11463150.

Temporal Representation:

These samples were collected on 6/11/2017 and 7/8/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318884

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Spatial Representation:

These samples were collected from sampling station name: RUSSIAN R A JIMTOWN CA; USGS-11463682.

Temporal Representation:

These samples were collected from 8/13/2015-10/28/2016.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318964

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: RUSSIAN R A PRESTON CA; station code: USGS-11463150.

Temporal Representation:

These samples were collected on 6/11/2017 and 7/8/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318884

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for USGS California Water Science Center and determined that calendar year 2017 does not exceed the 90% or 50% upper limit, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA; station code: USGS-383719122462501.

Temporal Representation:

These samples were collected on 5/1/2017 and 5/8/2017.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318980

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for EPA National Aquatic Resources Survey (NARS) and determined that calendar year 2013 does not exceed either the 90% or 50% upper limit, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River; station code: NARS_WQX-CAR9-0903.

Temporal Representation:

These samples were collected on 8/26/2913 and 9/25/2013.

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA; station code: USGS-383719122462501.

Temporal Representation:

These samples were collected on 5/1/2017 and 5/8/2017.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318980

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River; station code: NARS_WQX-CAR9-0903.

Temporal Representation:

These samples were collected on 8/26/2913 and 9/25/2013.

Environmental Conditions:

QAPP Information:

QAPP for EPA National Aquatic Resources Survey (NARS)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318948

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for USGS California Water Science Center and determined that calendar years 2017 and 2018 exceed the 50% upper limit, so that 2 of 2 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: RUSSIAN R A ASTI CA; station code: USGS-11463400.

Temporal Representation:

These samples were collected on 6/11/2017 and 6/10/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318260

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

QAPP Information:

QAPP for EPA National Aquatic Resources Survey (NARS)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318948

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: RUSSIAN R A ASTI CA; station code: USGS-11463400.

Temporal Representation:

These samples were collected on 6/11/2017 and 6/10/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318260

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for SWAMP RWB1 Monitoring and determined that 1 of 1 sample exceeds the water quality objective for calendar year 2016.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Lytton Creek at Russian River; station code: 114LY0010.

Temporal Representation:

This sample was collected on 3/5/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318454

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for SWAMP Perennial Stream Surveys and determined that for calendar year 2015 does not exceed either the 90% upper limit of 320 micromhos or 50% upper limit of 250 micromhos, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Russian River ~1.1mi above Crocker Cr.; station code: 114PS0289.

Temporal Representation:

This sample was collected on 7/6/2015.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Perennial Stream Surveys

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Water Board staff assessed specific conductivity data for SWAMP RWB1 Monitoring and determined that 1 of 1 sample exceeds the water quality objective for calendar year 2016.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Lytton Creek at Russian River; station code: 114LY0010.

Temporal Representation:

This sample was collected on 3/5/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318454

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Russian River ~1.1mi above Crocker Cr.; station code: 114PS0289.

Temporal Representation:

This sample was collected on 7/6/2015.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Perennial Stream Surveys

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318720

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conducivity data for USGS California Water Science Center and determined that calendar year 2018 exceeds both the 90% and 50% upper limit, so that 1 of 1 sample exceeds the water quality objective.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: BIG SULPHUR C NR CLOVERDALE CA; station code: USGS-11463200.

Temporal Representation:

This sample was collected on 6/10/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318471

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data from SWAMP RWB1 Monitoring and determined that calendar years 2013, 2014, and 2016 exceed both the 90% upper limit of 320 micromhos and 50% upper limit of 250 micromhos, calendar years 2011, 2012, and 2019 exceed the 50% upper limit of 250 micromhos, and calendar year 2017 does not exceed either upper limit, so that 6 of 7 samples exceed the water quality objective.

Data Reference:

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318720

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: BIG SULPHUR C NR CLOVERDALE CA; station code: USGS-11463200.

Temporal Representation:

This sample was collected on 6/10/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318471

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Alexander Valley Road; station code: 114RR4234.

Temporal Representation:

These samples were collected from 5/19/2011-6/24/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318474

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for SWAMP RWB1 Monitoring and determined that calendar year 2013 exceeds the 90% upper limit of 320 micromhos and calendar years 2011, 2012, 2013, 2015, and 2016 exceed the 50% upper limit of 250 micromhos, so that 5 of 5 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Camp Rose Beach; station code: 114RR3119.

Temporal Representation:

These samples were collected from 5/19/2011-7/20/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 163057, Specifies/programs/tmdl/records/region_1/2022/ref5888.xlsx">Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Alexander Valley Road; station code: 114RR4234.

Temporal Representation:

These samples were collected from 5/19/2011-6/24/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318474

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Camp Rose Beach; station code: 114RR3119.

Temporal Representation:

These samples were collected from 5/19/2011-7/20/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318478

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for SWAMP RWB1 Monitoring and determined that calendar years 2016, 2017, and 2018 do not exceed either the 90% upper limit of 320 micromhos or 50% upper limit of 250 micromhos and calendar year 2019 exceeds the 50% upper limit of 250 micromhos, so that 1 of 4 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Cloverdale Airport; station code: 114RR5407.

Temporal Representation:

These samples were from 3/5/2016-8/19/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318481

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for SWAMP RWB1 Monitoring and determined that calendar years 2012, 2013, and 2015 do not exceed either the 90% upper limit of 320 micromhos or 50% upper limit of 250 micromhos, so that 0 of 3 samples exceed the water quality objective.

Data Reference:

SWAMP Datac Conductivity

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318478

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Cloverdale Airport; station code: 114RR5407.

Temporal Representation:

These samples were from 3/5/2016-8/19/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318481

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Cloverdale River Park; station code: 114RR5748.

Temporal Representation:

These samples were collected from 5/21/2012-8/24/2015.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318483

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for SWAMP RWB1 Monitoring and determined that calendar years 2012 and 2016 did not exceed either the 90% upper limit of 320 micromhos or 50% upper limit of 250 micromhos, so that 0 of 2 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Crocker Road; station code: 114RR5652.

Temporal Representation:

These samples were collected from 6/6/2012-7/20/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity

Region 1

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Cloverdale River Park; station code: 114RR5748.

Temporal Representation:

These samples were collected from 5/21/2012-8/24/2015.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318483

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Crocker Road; station code: 114RR5652.

Temporal Representation:

These samples were collected from 6/6/2012-7/20/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318485

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for SWAMP RWB1 Monitoring and determined that calendar years 2015 and 2016 did not exceed the 90% upper limit of 320 micromhos and did exceed the 50% upper limit of 250 micromhos, so that 2 of 2 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Del Rio Woods Park; station code: 114RR3173,

Temporal Representation:

These samples were collected from 8/24/2015-7/20/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

317914

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project SWAMP RWB1 Monitoring and determined calendar year 2016 does not exceed either the 90% or 50% upper limit and calendar year 2017 exceeds the 90% objective, so that 1 of 2 samples exceed the water quality objective for specific conductivity.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): The 90% upper limit specific conductance objective at 77 F is 320 micromhos (or mS/cm2). The 50% upper limit specific conductcolor:#CCCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318485

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Del Rio Woods Park; station code: 114RR3173,

Temporal Representation:

These samples were collected from 8/24/2015-7/20/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

317914

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Big Sulphur Creek at River Road; station code: 114BS0310.

Temporal Representation:

These samples were collected from 12/15/2016-12/20/2017.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

46816

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Zero of the 2 specific conductivity samples collected in Foss Creek exceeds the specific conductivity water quality objective. The sample concentrations range from 147 to 270 uS. The samples were collected as part of the Russian River First Flush sampling event. Data are summarized by Katznelson et al. (2003). This LOE re-assesses data from LOE 6209 from the 2010 Integrated Report cycle, which incorrectly compared the data against the site-specific specific conductivity objective for the mainstem Russian River. The data are now compared to the secondary MCL as is appropriate.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from 2 sites in Foss Creek as follows: (1) in Foss Creek in downtown Healdsburg, and (2) in Upper Foss Creek.

Temporal Representation:

The samples were collected on November 7, 2002. At each site, 3 instantaneous grab samples were collected over half hour increments. The data are averaged for each site.

Environmental Conditions:

Samples were collected during the first runoff event of the rainy season.

QAPP Information:

Samples were collected in accordance with the study plan and quality control procedures described by Katznelson et al. (2003).

QAPP Information Reference(s):

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

Line of Evidenceance objective at 77 F is 250 micromhos (or mS/cm2). The 90% and 50% upper limits represent the 90/50 percentile values for a calendar year. 90% or 50% or more of the values must be less than or equal to the upper limit.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Big Sulphur Creek at River Road; station code: 114BS0310.

Temporal Representation:

These samples were collected from 12/15/2016-12/20/2017.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

46816

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from 2 sites in Foss Creek as follows: (1) in Foss Creek in downtown Healdsburg, and (2) in Upper Foss Creek.

Temporal Representation:

The samples were collected on November 7, 2002. At each site, 3 instantaneous grab samples were collected over half hour increments. The data are averaged for each site.

Environmental Conditions:

Samples were collected during the first runoff event of the rainy season.

QAPP Information:

Samples were collected in accordance with the study plan and quality control procedures described by Katznelson et al. (2003).

QAPP Information Reference(s):

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100851

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR2769).

Temporal Representation:

The samples were collected between the dates 06//01/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100850

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100851

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR2769).

Temporal Representation:

The samples were collected between the dates 06//01/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100850

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR2861).

Temporal Representation:

The samples were collected between the dates 06/07/2011 - 10/24/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100844

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 2samples exceeded the water quality standard for specific conductance. Data range from 204 - 403.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652).

Temporal Representation:

The samples were collected between the dates 09/28/2010 - 11/30/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR2861).

Temporal Representation:

The samples were collected between the dates 06/07/2011 - 10/24/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100844

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652).

Temporal Representation:

The samples were collected between the dates 09/28/2010 - 11/30/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100853

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 sample exceeded the water quality standard for specific conductance. Data range from 221 - 262.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR2599).

Temporal Representation:

The samples were collected between the dates 06/07/2011 - 10/24/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100843

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5748).

Temporal Representation:

The samples were collected between the dates 05/26/2011 - 10/06/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 100853 Pollutant: Specific Conductivity LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 sample exceeded the water quality standard for specific conductance. Data range from 221 - 262. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: Specific conductivity shall conform to Table 3-1 which states that water quality objective for specific conductivity has an 90% upper limit of 320 micromhos and a 50% upper limit of 250 micromhos. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR2599). Temporal Representation: The samples were collected between the dates 06/07/2011 - 10/24/2011. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 163057, Specific Conductivity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 100843 Pollutant: Specific Conductivity LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for specific conductance. Data range from 210 - 269. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: Specific conductivity shall conform to Table 3-1 which states that water quality objective for specific conductivity has an 90% upper limit of 320 micromhos and a 50% upper limit of 250 micromhos. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5748). Temporal Representation: The samples were collected between the dates 05/26/2011 - 10/06/2011. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	157584	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Temperature, water
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	Flow Alteration/Regulation/Modification \| Removal of Riparian Vegetation
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the CWA section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Twenty-four lines of evidence are available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 303(d) listing determinations made prior to 2006 were not held in an assessment database. LOE 4765 is a placeholder for the 303(d) listing data and information from a previous assessment cycle that was initially utilized to make this listing determination. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met. This listing applies to the entire waterbody. BIG SULPHUR CREEK has two lines of evidence (LOEs 326968, 329278) and 0 of 6 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. DRY CREEK has one line of evidence (LOE 329274) and 1 of 1 sample exceeds the FRANZ CREEK has one line of evidence (LOE 326943) and 0 of 2 samples exceed the LYTTON CREEK has one line of evidence (LOE 326976) and 0 of 1 sample exceeds the MAACAMA CREEK has one line of evidence (LOE 329255) and 0 of 2 samples exceed the RUSSIAN RIVER has sixteen lines of evidence (LOEs 33218, 43279, 326911, 326920, 326927, 326929, 326934, 326945, 326956, 326975, 329249, 329254, 329270, 329288, 329300, 329310) and 97 of 253 samples exceed the RUSSIAN RIVER HU, MIDDLE RUSSIAN RIVER HA, GEYSERVILLE HSA waterbody has two lines of evidence (LOEs 4765, 31517), which establishes that data had been assessed prior to 2006 and that the temperature of the waterbody is altered from natural conditions. This listing applies to the entire waterbody.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:	BIG SULPHUR CREEK has two lines of evidence (LOEs 326968, 329278) and 0 of 6 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. DRY CREEK has one line of evidence (LOE 329274) and 1 of 1 sample exceeds the FRANZ CREEK has one line of evidence (LOE 326943) and 0 of 2 samples exceed the LYTTON CREEK has one line of evidence (LOE 326976) and 0 of 1 sample exceeds the MAACAMA CREEK has one line of evidence (LOE 329255) and 0 of 2 samples exceed the RUSSIAN RIVER has sixteen lines of evidence (LOEs 33218, 43279, 326911, 326920, 326927, 326929, 326934, 326945, 326956, 326975, 329249, 329254, 329270, 329288, 329300, 329310) and 97 of 253 samples exceed the RUSSIAN RIVER HU, MIDDLE RUSSIAN RIVER HA, GEYSERVILLE HSA waterbody has two lines of evidence (LOEs 4765, 31517), which establishes that data had been assessed prior to 2006 and that the temperature of the waterbody is altered from natural conditions. This listing applies to the entire waterbody.

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:	This listing applies to the entire waterbody.

Line of Evidence (LOE) for Decision ID 157584, Temperature, water

Region 1

Russian River HU, Middle Russian Ri


DECISION ID	157584	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Temperature, water
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	Flow Alteration/Regulation/Modification \| Removal of Riparian Vegetation
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the CWA section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Twenty-four lines of evidence are available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 303(d) listing determinations made prior to 2006 were not held in an assessment database. LOE 4765 is a placeholder for the 303(d) listing data and information from a previous assessment cycle that was initially utilized to make this listing determination. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met. This listing applies to the entire waterbody. BIG SULPHUR CREEK has two lines of evidence (LOEs 326968, 329278) and 0 of 6 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. DRY CREEK has one line of evidence (LOE 329274) and 1 of 1 sample exceeds the FRANZ CREEK has one line of evidence (LOE 326943) and 0 of 2 samples exceed the LYTTON CREEK has one line of evidence (LOE 326976) and 0 of 1 sample exceeds the MAACAMA CREEK has one line of evidence (LOE 329255) and 0 of 2 samples exceed the RUSSIAN RIVER has sixteen lines of evidence (LOEs 33218, 43279, 326911, 326920, 326927, 326929, 326934, 326945, 326956, 326975, 329249, 329254, 329270, 329288, 329300, 329310) and 97 of 253 samples exceed the RUSSIAN RIVER HU, MIDDLE RUSSIAN RIVER HA, GEYSERVILLE HSA waterbody has two lines of evidence (LOEs 4765, 31517), which establishes that data had been assessed prior to 2006 and that the temperature of the waterbody is altered from natural conditions. This listing applies to the entire waterbody.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:	BIG SULPHUR CREEK has two lines of evidence (LOEs 326968, 329278) and 0 of 6 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. DRY CREEK has one line of evidence (LOE 329274) and 1 of 1 sample exceeds the FRANZ CREEK has one line of evidence (LOE 326943) and 0 of 2 samples exceed the LYTTON CREEK has one line of evidence (LOE 326976) and 0 of 1 sample exceeds the MAACAMA CREEK has one line of evidence (LOE 329255) and 0 of 2 samples exceed the RUSSIAN RIVER has sixteen lines of evidence (LOEs 33218, 43279, 326911, 326920, 326927, 326929, 326934, 326945, 326956, 326975, 329249, 329254, 329270, 329288, 329300, 329310) and 97 of 253 samples exceed the RUSSIAN RIVER HU, MIDDLE RUSSIAN RIVER HA, GEYSERVILLE HSA waterbody has two lines of evidence (LOEs 4765, 31517), which establishes that data had been assessed prior to 2006 and that the temperature of the waterbody is altered from natural conditions. This listing applies to the entire waterbody.

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:	This listing applies to the entire waterbody.

ia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43279

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Water Temperature.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature.

Objective/Criterion Reference:

Evaluation Guideline:

Per "Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids" (Carter 2008): The lethal temperature evaluation guideline for both steelhead adult migration & holding and juvenile growth & rearing of 24°C applies in this water body June-October. The lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C and applies November-May. See LOE ID 31517 for more information on natural temperature alterations and salmonid presence and periodicity in this water body.

Guideline Reference:

Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33218

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Three of the fifty-seven (57) grab sample values were above the evaluation guideline. Temperatures ranged from 15.7 degrees C to 24.8 degrees C.

Data Reference:

LOE ID:

43279

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33218

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Three of the fifty-seven (57) grab sample values were above the evaluation guideline. Temperatures ranged from 15.7 degrees C to 24.8 degrees C.

Data Reference:

Data for Bacteria and Nutrient in Sonoma County Water Agency, 2009-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Grab samples were collected at three different locations on the Russian River: Cloverdale River Park, Geyserville @ Highway 128 Bridge, and Alexander Valley Campground.

Temporal Representation:

Grab samples collected between 5/28/09 and 10/1/2009.

Environmental Conditions:

QAPP Information:

Per the Sonoma County Water Agency (SCWA) the data are provisional and may contain inaccuracies as they have not gone through QA procedures.

QAPP Information Reference(s):

Quality Assurance Project Plan for Region One for Bacteriological Sampling.

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329310

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonr_issues/programs/tmdl/records/region_1/2010/ref3902.zip">Data for Bacteria and Nutrient in Sonoma County Water Agency, 2009-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Grab samples were collected at three different locations on the Russian River: Cloverdale River Park, Geyserville @ Highway 128 Bridge, and Alexander Valley Campground.

Temporal Representation:

Grab samples collected between 5/28/09 and 10/1/2009.

Environmental Conditions:

QAPP Information:

Per the Sonoma County Water Agency (SCWA) the data are provisional and may contain inaccuracies as they have not gone through QA procedures.

QAPP Information Reference(s):

Quality Assurance Project Plan for Region One for Bacteriological Sampling.

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329310

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463980 (RUSSIAN R A DIGGER BEND NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2014-09-15 and 2017-11-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329249

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed EPA National Aquatic Resources Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 2 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River).

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329254

Pollutant:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463980 (RUSSIAN R A DIGGER BEND NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2014-09-15 and 2017-11-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329249

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River).

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329254

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329255

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329255

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-05-01 and 2017-05-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329270

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463682 (RUSSIAN R A JIMTOWN CA).

Temporal Representation:

The samples were collected between the dates of 2015-08-13 and 2016-10-28

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-05-01 and 2017-05-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329270

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463682 (RUSSIAN R A JIMTOWN CA).

Temporal Representation:

The samples were collected between the dates of 2015-08-13 and 2016-10-28

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329274

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Dry Creek Rancheria Band of Pomo Indians, California (Tribal) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: DCRBPI_ WQX-VY1 (Vineyard reach stage and temp).

Temporal Representation:

The samples were collected between the dates of 2016-06-02 and 2016-06-02

Environmental Conditions:

QAPP Information:

Dry Creek Rancheria Band of Pomo Indians QA

QAPP Information Reference(s):

Data collected by a California Tribe QAPP Approved by U.S. EPA QAPP Reference

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329278

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Waterlpadding="0">

Line of Evidence (LOE) for Decision ID 157584, Temperature, water

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329274

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: DCRBPI_ WQX-VY1 (Vineyard reach stage and temp).

Temporal Representation:

The samples were collected between the dates of 2016-06-02 and 2016-06-02

Environmental Conditions:

QAPP Information:

Dry Creek Rancheria Band of Pomo Indians QA

QAPP Information Reference(s):

Data collected by a California Tribe QAPP Approved by U.S. EPA QAPP Reference

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329278

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

4765

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

Unspecified

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157584, Temperature, water

Region 1

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

4765

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

Presentation: Interpreting Temperature Standards in the North Coast Region. North Coast Regional Water Quality Control Board.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

Unspecified

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

31517

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

The following process is utilized to interpret the narrative Temperature Objective in the Basin Plan for impairment assessments. Step 1: determine if temperatures reflect natural conditions. If Yes, then the water body is not considered impaired, if No, Then go to Step 2. Step 2: Determine if temperatures adversely affect beneficial uses. If Yes, then the water body is considered impaired, if No, then go to Step 3. Step 3: Determine if temperatures are increased by 5 degrees F. If Yes, then water body is impaired, if No, then water body is not impaired.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EVIDENCE OF ALTERATION OF NATURAL RECEIVING WATER TEMPERATURES (NON-NATURAL TEMPS): Water temperatures of the Russian River HA, including the Geyserville HSA, do not reflect natural conditions as environmental factors that influence water temperature have been altered by human activities. Examples of human alteration to the Russian River include flow changes resulting from the Potter Valley Project and dam construction, as well as landuse practices, such as logging and agriculture, which have resulted in alterations to streambanks, channel morphology, and stream temperatures (FERC 2002). EVIDENCE OF SALMONID PRESENCE & LIFE CYCLE USE: Coho, steelhead, and Chinook are all present in the Russian River watershed (CDFG 2002). Spawning, incubation, and emergence for these three salmonid species cumulatively occurs November through the end of May. Steelhead juveniles rear year-round in the Russian River (Steiner Environmental Consulting 1996).

Guideline Reference:

Biological Opinion for the Proposed License Amendment to the Potter Valley Project (FERC Project #77-110)

Guideline Reference:

Historical Salmonid Streams and Calwater 2.2a Hydrologic Subareas. Figure shows Chinook, coho, and steelhead distribution in the Russian River watershed.

Guideline Reference:

A History of the Salmonid Decline in the Russian River.

Spatial Representation:

Information pertains to Russian River HU, including the Geyserville HSA.

Temporal Representation:

Data are reflective of current conditions in this water body.

Environmental Conditions:

QAPP Information:

Information is considered to be of adequate quality for the Integrated Report.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326927

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

31517

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Data Reference:

Presentation: Interpreting Temperature Standards in the North Coast Region. North Coast Regional Water Quality Control Board.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Biological Opinion for the Proposed License Amendment to the Potter Valley Project (FERC Project #77-110)

Guideline Reference:

Historical Salmonid Streams and Calwater 2.2a Hydrologic Subareas. Figure shows Chinook, coho, and steelhead distribution in the Russian River watershed.

Guideline Reference:

A History of the Salmonid Decline in the Russian River.

Spatial Representation:

Information pertains to Russian River HU, including the Geyserville HSA.

Temporal Representation:

Data are reflective of current conditions in this water body.

Environmental Conditions:

QAPP Information:

Information is considered to be of adequate quality for the Integrated Report.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326927

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 24 of 58 samples exceeded the water quality threshold for Temperature.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2011-05-24 and 2019-06-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326920

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 24 of 58 samples exceeded the water quality threshold for Temperature.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2011-05-24 and 2019-06-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326920

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2012-06-11 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326911

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 4 of 12 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5748 (Russian River at Cloverdale River Park).

Temporal Representation:

The samples were collected between the dates of 2012-05-23 and 2015-08-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326929

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 7 of 19 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4751 (Russian River at Highway 128-114RR4751).

Temporal Representation:

The samples were collected between the dates of 2011-05-26 and 2011-10-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326934

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 2 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3173 (Russian River at Del Rio Woods Park).

Temporal Representation:

The samples were collected between the dates of 2015-08-24 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326943

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-06 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326956

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 33 of 44 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3119 (Russian River at Camp Rose Beach-114RR3119).

Temporal Representation:

The samples were collected between the dates of 2011-05-24 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WaterWater Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326976

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2012-06-11 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326911

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 4 of 12 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5748 (Russian River at Cloverdale River Park).

Temporal Representation:

The samples were collected between the dates of 2012-05-23 and 2015-08-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 15>

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114LY0010 (Lytton Creek at Russian River).

Temporal Representation:

The samples were collected between the dates of 2016-03-05 and 2016-03-05

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326945

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 15 of 25 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326929

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 7 of 19 samples exceeded the water quality threshold for Temperature.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4751 (Russian River at Highway 128-114RR4751).

Temporal Representation:

The samples were collected between the dates of 2011-05-26 and 2011-10-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326934

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 2 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3173 (Russian River at Del Rio Woods Park).

Temporal Representation:

The samples were collected between the dates of 2015-08-24 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326943

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalkign="left" valign="top" width="67%">Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2016-03-05 and 2019-07-30

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326968

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326975

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329288

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Temporal Representation:

The samples were collected between the dates of 2019-01-06 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326956

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 33 of 44 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3119 (Russian River at Camp Rose Beach-114RR3119).

Temporal Representation:

The samples were collected between the dates of 2011-05-24 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326976

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

WaterData Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329300

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463000 (RUSSIAN R NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2015-07-08 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Temperature.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114LY0010 (Lytton Creek at Russian River).

Temporal Representation:

The samples were collected between the dates of 2016-03-05 and 2016-03-05

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326945

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 15 of 25 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

DECISION ID

157588

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Turbidity
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)(2006)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the CWA section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Eight lines of evidence are available in the administrative record to assess this pollutant. Ten of 18 samples exceed the Cold Freshwater Habitat beneficial use guideline. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Ten of 18 samples exceed the Cold Freshwater Habitat beneficial use guideline and this exceeds the allowable frequency listed in Table 4.2 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157588, Turbidity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329346

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters designateign="left" valign="top" width="67%">Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2016-03-05 and 2019-07-30

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326968

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326975

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329288

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157584, Temperature, water	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329300

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463000 (RUSSIAN R NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2015-07-08 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

d for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15, Division 4, Article 4, Section 64435 (Tables 2 and 3), and Section 64444.5 (Table 5), and listed in Table 3-2 of this Plan (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

California Maximum Contaminant Levels (MCLs) apply to ambient surface waters under the Basin Plan's 'Chemical Constituents' objective. The Secondary MCL for turbidity is 5 NTU. Calculation of a numeric objective for other beneficial uses requires comparison with upstream or other background data which may not be available as part of the data used for water quality assessment.

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463682 (RUSSIAN R A JIMTOWN CA).

Temporal Representation:

The samples were collected between the dates of 2015-08-13 and 2016-10-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157588, Turbidity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327200

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15, Division 4, Article 4, Section 64435 (Tables 2 and 3), and Section 64444.5 (Table 5), and listed in Table 3-2 of this Plan (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2012-05-23 and 2012-05-29

Environmental Conditions:

QAPP In


DECISION ID	157588	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Turbidity
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)(2006)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the CWA section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Eight lines of evidence are available in the administrative record to assess this pollutant. Ten of 18 samples exceed the Cold Freshwater Habitat beneficial use guideline. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Ten of 18 samples exceed the Cold Freshwater Habitat beneficial use guideline and this exceeds the allowable frequency listed in Table 4.2 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157588, Turbidity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329346

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463682 (RUSSIAN R A JIMTOWN CA).

Temporal Representation:

The samples were collected between the dates of 2015-08-13 and 2016-10-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157588, Turbidity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327200

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2012-05-23 and 2012-05-29

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157588, Turbidity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327359

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157588, Turbidity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327237

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157588, Turbidity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327359

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157588, Turbidity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327237

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 2 samples exceeded the water quality threshold for Turbidity.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5748 (Russian River at Cloverdale River Park).

Temporal Representation:

The samples were collected between the dates of 2012-05-23 and 2012-05-29

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157588, Turbidity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327298

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Turbidity.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 2 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5748 (Russian River at Cloverdale River Park).

Temporal Representation:

The samples were collected between the dates of 2012-05-23 and 2012-05-29

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157588, Turbidity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327298

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Turbidity.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3119 (Russian River at Camp Rose Beach-114RR3119).

Temporal Representation:

The samples were collected between the dates of 2012-05-23 and 2012-05-29

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157588, Turbidity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

1745

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

By combining the data from the three sampling sites there were 10 samples out of the 18 samples that were above the evaluation guideline. The exceedances ranged from 30.5 NTU up to 356 NTU (Sandler, 2004).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan: The suspended sediment load and suspended sediment discharge rate of surface waters shall not be altered in such a manner as to cause nuisance or adversely affect beneficial uses. Turbidity shall not be increased more than 20 percent above naturally occurring background levels. Allowable zones of dilution within which higher percentages can be tolerated may be defined for specific discharges upon the issuance of discharge permits or waiver thereof. Water shall not contain substances in concentrations that result in deposition of material that causes nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline that has been used to determine turbidity exceedance is from published-peer reviewed paper, "The Effects of Chronic Turbidity on Density and Growth of Steelheads and Coho Salmon", John W Sigler (1984). The guideline is "In our studies, as little as 25 NTUs of turbidity caused a reduction in fish growth."

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

There were three sampling locations along the Russian River, one at Healdsburg, and two at Cloverdale. They are as follows:
-Sample site RUS070 is located at the Healdsburg Veteran's beach, Healdsburg.
-Sample site RUS080 is located at the Cloverdale 1st St. bridge, Cloverdale.
-Sample site RUS090 is located at the Cloverdale River Park, Cloverdale.

Temporal Representation:

RUS070 was sampled once a month January through April 2003. RUS080 and RUS090 were sampled once a month, January through May 2003, and in July and August 2003. Samples were taken on the same days of the month at each location.

Environmental Conditions:

QAPP Information:

Draft QAPP for Volunteer Water Quality Monitoring Project for the Community Clean Water Institute.

QAPP Information Reference(s):

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3119 (Russian River at Camp Rose Beach-114RR3119).

Temporal Representation:

The samples were collected between the dates of 2012-05-23 and 2012-05-29

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157588, Turbidity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

1745

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

Draft QAPP for Volunteer Water Quality Monitoring Project for the Community Clean Water Institute.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157588, Turbidity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329350

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463980 (RUSSIAN R A DIGGER BEND NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2014-09-15 and 2017-11-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157588, Turbidity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329387

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed EPA National Aquatic Res-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 157588, Turbidity

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329350

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463980 (RUSSIAN R A DIGGER BEND NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2014-09-15 and 2017-11-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157588, Turbidity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329387

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed EPA National Aquatic Resources Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Turbidity.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River).

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

ources Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Turbidity.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River).

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .


DECISION ID	157599	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Aldicarb
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 120059 has been replaced by LOE 348989 and LOE 120061 has been replaced by LOE 348989 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157599, Aldicarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

348988

Pollutant:

Aldicarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aldicarb.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for aldicarb is the USEPA Aquatic Life Benchmark of 0.46 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157599, Aldicarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

348989

Pollutant:

Aldicarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aldicarb.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for aldicarb is the USEPA Aquatic Life Benchmark of 0.46 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157599, Aldicarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322860

Pollutant:

Aldicarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aldicarb.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to aldicarb as a drinking water level is a concentration of 0.007 mg/L.

Guideline Reference:

2018 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157599, Aldicarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322863

Pollutant:

Aldicarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aldicarb.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for aldicarb is the USEPA Aquatic Life Benchmark of 0.46 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157599, Aldicarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322858

Pollutant:

Aldicarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aldicarb.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for aldicarb is the USEPA Aquatic Life Benchmark of 0.46 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157599, Aldicarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120060

Pollutant:

Aldicarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aldicarb.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for aldicarb incorporated by reference in the Water Quality Control Plan, North Coast Basin is 3 ug/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	157600	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Aldrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

40914

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120062

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Aldrin.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect aquatic life in freshwater as criterion maximum concentration is 3 ug/L . This established criteria was divided by 2 in order to better represent a CMC value as specified in footnote g of Table (b)(1) of the California Toxics Rule, 2000.

Objective/Criterion Reference:

Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120063

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Aldrin.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

113754

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic


DECISION ID	157599	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Aldicarb
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 120059 has been replaced by LOE 348989 and LOE 120061 has been replaced by LOE 348989 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157599, Aldicarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

348988

Pollutant:

Aldicarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aldicarb.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for aldicarb is the USEPA Aquatic Life Benchmark osubstances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin criteria for the protection of human health from consumption of organisms only is 0.00014 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114283

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin criteria for the protection of human health from consumption of organisms only is 0.00014 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157599, Aldicarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

348989

Pollutant:

Aldicarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aldicarb.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for aldicarb is the USEPA Aquatic Life Benchmark of 0.46 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157599, Aldicarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322860

Pollutant:

Aldicarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Line of Evidence (LOE) for Decision ID 157600, Aldrin

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

40942

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

40922

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aldicarb.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to aldicarb as a drinking water level is a concentration of 0.007 mg/L.

Guideline Reference:

2018 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157599, Aldicarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322863

Pollutant:

Aldicarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aldicarb.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for aldicarb is the USEPA Aquatic Life Benchmark of 0.46 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157599, Aldicarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322858

Pollutant:

Aldicarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aldicarb.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for aldicarb is the USEPA Aquatic Life Benchmark of 0.46 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157599, Aldicarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120060

Pollutant:

Aldicarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aldicarb.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for aldicarb incorporated by reference in the Water Quality Control Plan, North Coast Basin is 3 ug/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

113753

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect of human health from the consumption of water and organisms is 0.00013 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

110308

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect of human health from the consumption of water and organisms is 0.00013 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

40978

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322388

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science guidelines (NAS 1972) establish a maximum Aldrin concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.

Guideline Reference:

DECISION ID

157600

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Aldrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

lign="left" valign="top" width="67%">National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

40914

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120062

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Aldrin.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120063

Pollutant:

Aldrin

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Data for this line of evidence were collected between 2015-08-03 and 2015-08-03. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes.

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322376

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157600, Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Aldrin.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

113754

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic px; font-smooth: always">Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123967

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Aldrin, Total. Twenty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123980

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Aldrin, Total. Five sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123979

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Aldrin, Total. Twenty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin criteria for the protection of human health from consumption of organisms only is 0.00014 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114RR5652). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 114283 Pollutant: Aldrin LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Aldrin. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin criteria for the protection of human health from consumption of organisms only is 0.00014 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114BS0310). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 40942 Pollutant: Aldrin LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin criteria for the protection of human health from consumption of organisms only is 0.00014 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 40922 Pollutant: Aldrin LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Data Reference:


DECISION ID	157601	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Alkalinity as CaCO3
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Twenty lines of evidence are available in the administrative record to assess this pollutant. One of 30 samples for the COLD beneficial use and 1 of 14 samples for the WARM beneficial use exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of 30 samples for the COLD beneficial use and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327844

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323129

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327861

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327859

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327850

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

113753

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect of human health from the consumption of water and organisms is 0.00013 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327840

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463980 (RUSSIAN R A DIGGER BEND NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2011-07-28 and 2011-07-28

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120065

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

110308

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect of human health from the consumption of water and organisms is 0.00013 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

40978

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120064

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322388

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120066

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

103076

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances lign="left" valign="top" width="67%">National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322376

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157600, Aldrin

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114PS0229)

Temporal Representation:

The samples were collected between the dates of 2013-06-04 and 2013-06-04

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322886

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2017-07-18 and 2019-06-25

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123967

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123980

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157600, Aldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123979

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

div style="background-color:#CCCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 322928 Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 322989 Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 1 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road). Temporal Representation: The samples were collected between the dates of 2019-01-16 and 2019-01-16 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323088 Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP Perennial Stream Surveys data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.). Temporal Representation: The samples were collected between the dates of 2015-07-06 and 2015-07-06 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP <


DECISION ID	157601	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Alkalinity as CaCO3
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Twenty lines of evidence are available in the administrative record to assess this pollutant. One of 30 samples for the COLD beneficial use and 1 of 14 samples for the WARM beneficial use exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of 30 samples for the COLD beneficial use and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327844

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 322929 Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 322887 Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Warm Freshwater Habitat Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Alkalinity as CaCO3. left" valign="top" width="33%">Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323129 Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP Perennial Stream Surveys data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.). Temporal Representation: The samples were collected between the dates of 2015-07-06 and 2015-07-06 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2017-07-18 and 2019-06-25

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327846

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463980 (RUSSIAN R A DIGGER BEND NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2011-07-28 and 2011-07-28

Environmental Conditions:

QAPP Information:

QAPP not required for: 100%; text-align: right; PADDING-TOP: 3px; font-smooth: always">Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327861 Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Warm Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327859 Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327862 Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 322990 Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 1 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road). Temporal Representation: The samples were collected between the dates of 2019-01-16 and 2019-01-16 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327843 Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle ; Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327850 Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Warm Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle



DECISION ID	157606	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Ametryn
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157606, Ametryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323263

Pollutant:

Ametryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ametryn.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to ametryn as a drinking water level is a concentration of 0.06 mg/L

Guideline Reference: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327840 Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463980 (RUSSIAN R A DIGGER BEND NR HEALDSBURG CA). Temporal Representation: The samples were collected between the dates of 2011-07-28 and 2011-07-28 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 120065 Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3. Data Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157606, Ametryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 120073 Pollutant: Ametryn LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Ametryn. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ametryn as a drinking water level is a concentration of 0.06 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157606, Ametryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 120071 Pollutant: Ametryn LOE Subgroup: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 120064 Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 7 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Alkalinity as CaCO3. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-09-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Ametryn.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ametryn as a drinking water level is a concentration of 0.06 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157606, Ametryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323268

Pollutant:

Ametryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ametryn.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ametryn is the USEPA Aquatic Life Benchmark of 3.67 ug/L for nonvascular plants.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157606, Ametryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120072

Pollutant:

Ametryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ametryn.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ametryn as a drinking water level is a concentration of 0.06 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157606, Ametryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323267

Pollutant:

Ametryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ametryn.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ametryn is the USEPA Aquatic Life Benchmark of 3.67 ug/L for nonvascular plants.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

DDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: right; PADDING-TOP: 3px; font-smooth: always">Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 120066 Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 7 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Alkalinity as CaCO3. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-09-28 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 103076 Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP Perennial Stream Surveys data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114PS0229) Temporal Representation: The samples were collected between the dates of 2013-06-04 and 2013-06-04 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 322886 Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport). Temporal Representation: The samples were collected between the dates of 2017-07-18 and 2019-06-25 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP Guideline Reference: ="left" valign="top" width="33%">Matrix:

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3

Region 1


DECISION ID	157617	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Aminomethyl Phosphonic Acid (AMPA)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157617, Aminomethyl Phosphonic Acid (AMPA)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323572

Pollutant:

Aminomethyl Phosphonic Acid (AMPA)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for AMPA.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for AMPA is the USEPA Aquatic Life Benchmark of 249,500 ug/L for a fish (acute).

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322928

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322989

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

SWAMP Data:

SWAMP

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-02-07

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157617, Aminomethyl Phosphonic Acid (AMPA)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323583

Pollutant:

Aminomethyl Phosphonic Acid (AMPA)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for AMPA.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for AMPA is the USEPA Aquatic Life Benchmark of 249,500 ug/L for a fish (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2017-02-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157617, Aminomethyl Phosphonic Acid (AMPA)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323570

Pollutant:

Aminomethyl Phosphonic Acid (AMPA)

LOE Subgroup:

Pollutant-Water

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323088

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322929

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322887

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for AMPA.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for AMPA is the USEPA Aquatic Life Benchmark of 249,500 ug/L for a fish (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-02-07

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157617, Aminomethyl Phosphonic Acid (AMPA)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108279

Pollutant:

Aminomethyl Phosphonic Acid (AMPA)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for AMPA.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for AMPA is the USEPA Aquatic Life Benchmark of 249500 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157617, Aminomethyl Phosphonic Acid (AMPA)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323581

Pollutant:

Aminomethyl Phosphonic Acid (AMPA)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for AMPA.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for AMPA is the USEPA Aquatic Life Benchmark of 249,500 ug/L for a fish (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2017-02-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157617, Aminomethyl Phosphonic Acid (AMPA)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108280

Pollutant:

Aminomethyl Phosphonic Acid (AMPA)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for AMPA.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for AMPA is the USEPA Aquatic Life Benchmark of 249500 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport). Temporal Representation: The samples were collected between the dates of 2017-07-18 and 2019-06-25 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327846 Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463980 (RUSSIAN R A DIGGER BEND NR HEALDSBURG CA). Temporal Representation: The samples were collected between the dates of 2011-07-28 and 2011-07-28 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157601, Alkalinity as CaCO3	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA


DECISION ID	161428	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Ammonia
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108266

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2011-04-12 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108276

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2011-04-12 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

34577

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:


DECISION ID	157606	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Ametryn
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157606, Ametryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323263

Pollutant:

Ametryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ametryn.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to ametryn as a drinking water level is a concentration of 0.06 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157606, Ametryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120073

Pollutant:

Ametryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Ametryn.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ametryn as a drinking water level is a concentration of 0.06 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157606, Ametryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120071

Pollutant:

Ametryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the samples exceed the water USEPA Temperature and pH-Dependent values of the CCC (Chronic Criterion) for Fish Early Life Stages Present for ammonia. 1 of the 4 data is reported as a non-detect limit. This non-detect limit is less than or equal to the water quality standard, the value will be considered as meeting the water quality standard, objective, criterion, or evaluation guideline.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Update of Ambient Water Quality Criteria for Ammonia (USEPA 1999): Where salmonids and fish early life stages are present, the 30-day average concentration (criterion continuous concentration or CCC) of total ammonia (as mg N/L) in freshwater are not to be exceeded more than once every three years on average. The CCC values are based on pH, temperature, and the presence of early life stages of fish. The CCC formula is found on p.83 and the table of CCC values are found on p.87.

Guideline Reference:

1999 Update of Ambient Water Quality Criteria for Ammonia

Spatial Representation:

Sample was collected at 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples collected between 11/26/2007 and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

34005

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

pH values were not reported for this site. Therefore, staff was unable to use the USEPA Temperature and pH-Dependent values of the CCC (Chronic Criterion) for Fish Early Life Stages Present for ammonia.

Data Reference:

Data for Bacteria and Nutrient in Sonoma County Water Agency, 2009-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

1999 Update of Ambient Water Quality Criteria for Ammonia

Spatial Representation:

Samples was collected at Russian River at Alexander Valley Campground.

Temporal Representation:

Samples were collected from 5/28/2009 to 10/1/2009.

Environmental Conditions:

QAPP Information:

No quality assurance information was provided.

QAPP Information Reference(s):

Quality Assurance Project Plan for Region One for Bacteriological Sampling.

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

109069

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114PS0229)

Temporal Representation:

The samples were collected between the dates of 2013-06-04 and 2013-06-04

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Ametryn.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ametryn as a drinking water level is a concentration of 0.06 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157606, Ametryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323268

Pollutant:

Ametryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ametryn.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ametryn is the USEPA Aquatic Life Benchmark of 3.67 ug/L for nonvascular plants.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157606, Ametryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120072

Pollutant:

Ametryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ametryn.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ametryn as a drinking water level is a concentration of 0.06 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157606, Ametryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323267

Pollutant:

Ametryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ametryn.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ametryn is the USEPA Aquatic Life Benchmark of 3.67 ug/L for nonvascular plants.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

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Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108273

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108267

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2011-04-12 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108277

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2011-04-12 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

DECISION ID

157617

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Aminomethyl Phosphonic Acid (AMPA)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157617, Aminomethyl Phosphonic Acid (AMPA)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323572

Pollutant:

Aminomethyl Phosphonic Acid (AMPA)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for AMPA.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for AMPA is the USEPA Aquatic Life Benchmark of 249,500 ug/L for a fish (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-02-07

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157617, Aminomethyl Phosphonic Acid (AMPA)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323583

Pollutant:

Aminomethyl Phosphonic Acid (AMPA)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for AMPA.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for AMPA is the USEPA Aquatic Life Benchmark of 249,500 ug/L for a fish (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2017-02-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

Line of Evidence (LOE) for Decision ID 157617, Aminomethyl Phosphonic Acid (AMPA)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323570

Pollutant:

Aminomethyl Phosphonic Acid (AMPA)

LOE Subgroup:

Pollutant-Water

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

102902

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114PS0229)

Temporal Representation:

The samples were collected between the dates of 2013-06-04 and 2013-06-04

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108278

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2011-04-12 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108274

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia

<="left" valign="top" width="33%">Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for AMPA.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for AMPA is the USEPA Aquatic Life Benchmark of 249,500 ug/L for a fish (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-02-07

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157617, Aminomethyl Phosphonic Acid (AMPA)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108279

Pollutant:

Aminomethyl Phosphonic Acid (AMPA)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for AMPA.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for AMPA is the USEPA Aquatic Life Benchmark of 249500 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157617, Aminomethyl Phosphonic Acid (AMPA)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323581

Pollutant:

Aminomethyl Phosphonic Acid (AMPA)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for AMPA.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for AMPA is the USEPA Aquatic Life Benchmark of 249,500 ug/L for a fish (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2017-02-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157617, Aminomethyl Phosphonic Acid (AMPA)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108280

Pollutant:

Aminomethyl Phosphonic Acid (AMPA)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for AMPA.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for AMPA is the USEPA Aquatic Life Benchmark of 249500 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

div style="background-color:#CCCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: right; PADDING-TOP: 3px; font-smooth: always">Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108268 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2011-04-12 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323425 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323424 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1

DECISION ID	161428	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Ammonia
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108266

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2011-04-12 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108276

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2011-04-12 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

34577

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:r>

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323527 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP Perennial Stream Surveys data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.). Temporal Representation: The samples were collected between the dates of 2015-07-06 and 2015-07-06 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323510 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP Perennial Stream Surveys data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.). Temporal Representation: The samples were collected between the dates of 2015-07-06 and 2015-07-06 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Fish Spawning Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: None of the samples exceed the water USEPA Temperature and pH-Dependent values of the CCC (Chronic Criterion) for Fish Early Life Stages Present for ammonia. 1 of the 4 data is reported as a non-detect limit. This non-detect limit is less than or equal to the water quality standard, the value will be considered as meeting the water quality standard, objective, criterion, or evaluation guideline. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Update of Ambient Water Quality Criteria for Ammonia (USEPA 1999): Where salmonids and fish early life stages are present, the 30-day average concentration (criterion continuous concentration or CCC) of total ammonia (as mg N/L) in freshwater are not to be exceeded more than once every three years on average. The CCC values are based on pH, temperature, and the presence of early life stages of fish. The CCC formula is found on p.83 and the table of CCC values are found on p.87. Guideline Reference: 1999 Update of Ambient Water Quality Criteria for Ammonia Spatial Representation: Sample was collected at 114RR5652 (Russian River at Crocker Road). Temporal Representation: Samples collected between 11/26/2007 and 7/14/2008. Environmental Conditions: QAPP Information: SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 34005 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Fish Spawning Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: pH values were not reported for this site. Therefore, staff was unable to use the USEPA Temperature and pH-Dependent values of the CCC (Chronic Criterion) for Fish Early Life Stages Present for ammonia. Data Reference: Data for Bacteria and Nutrient in Sonoma County Water Agency, 2009-2010. SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Update of Ambient Water Quality Criteria for Ammonia (USEPA 1999): Where salmonids and fish early life stages are present, the 30-day average concentration (criterion continuous concentration or CCC) of total ammonia (as mg N/L) in freshwater are not to be exceeded more than once every three years on average. The CCC values are based on pH, temperature, and the presence of early life stages of fish. The CCC formula is found on p.83 and the table of CCC values are found on p.87. Guideline Reference: 1999 Update of Ambient Water Quality Criteria for Ammonia Spatial Representation: Samples was collected at Russian River at Alexander Valley Campground. Temporal Representation: Samples were collected from 5/28/2009 to 10/1/2009. Environmental Conditions: QAPP Information: No quality assurance information was provided. QAPP Information Reference(s): Quality Assurance Project Plan for Region One for Bacteriological Sampling.

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 109069 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP Perennial Stream Surveys data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site(s) (114PS0229) Temporal Representation: The samples were collected between the dates of 2013-06-04 and 2013-06-04 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia

LOE ID:

323452

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2017-08-03 and 2019-06-25

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323560

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwaor:#CCCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: right; PADDING-TOP: 3px; font-smooth: always">Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108273 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108267 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.). Temporal Representation: The samples were collected between the dates of 2015-07-06 and 2015-07-06 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323371 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport). Temporal Representation: The samples were collected between the dates of 2017-07-18 and 2019-06-25 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108272 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2011-04-12 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108277 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2011-04-12 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323564 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108265 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-09-28 and 2010-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 120076 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat td>

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 102902 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP Perennial Stream Surveys data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys . SWAMP Data: SWAMP Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114PS0229) Temporal Representation: The samples were collected between the dates of 2013-06-04 and 2013-06-04 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108278 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2011-04-12 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108274 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program Region 1

Line of Evidence (LOE) for Decision ID 161428, Ammonia

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2010-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

110928

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed DFW_ABL_Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114CR0903)

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120079

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2010-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120075

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 161428, Ammonia

Region 1

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2010-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120078

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2010-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120074

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2010-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

46603

Pollutant:

Ammonia as Nitrogen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323514 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Number of Samples: 33 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: None of the 33 ammonia as nitrogen samples collected from the mainstem Russian River exceed the objective. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008). This LOE and LOE 46602 contain data originally evaluated in LOE 26333 from the 2010 Integrated Report cycle, which included data from a site that is not in this water body. The data from LOE 26333 have been split into two LOEs, with data now evaluated under the correct water body. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1) Evaluation Guideline: Per the National Recommended Water Quality Criteria (USEPA 2006): The 1-hour average concentration (acute criterion or CMC) of total ammonia nitrogen (in mg N/L) for freshwater where salmonid fish are present, which is not to be exceeded more than once every three years on average, is calculated using the following equation: CMC=0.275/(1+10^(7.204 - pH)) + 39.0/(1+10^(pH - 7.204)). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology Spatial Representation: Samples were collected from the mainstem Russian River at 5 locations as follows: (1) at Comminski Station (SWAMP Station ID 114RRCOMM), (2) at Cloverdale (SWAMP Station ID 114RRCLO1), (3) downstream of the Cloverdale Water Treatment Plant (SWAMP Station ID 114CLOSTP), (4) at Geyserville (SWAMP Station ID 114RRGEYS) and (5) at Alexander Valley Bridge (SWAMP Station ID 114RRALEX). Samples were collected from well-mixed flows in glides or riffles. Temporal Representation: At the Comminski Station, Geyserville, and Alexander Valley Bridge sites, samples were collected over 2 site visits at each site during June 2001. At the Cloverdale site samples were collected over 22 site visits from June 2001 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

None of the 55 ammonia as nitrogen samples collected from the mainstem Russian River exceed the objective. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008). Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1) Evaluation Guideline: Per the National Recommended Water Quality Criteria (USEPA 2006): The 1-hour average concentration (acute criterion or CMC) of total ammonia nitrogen (in mg N/L) for freshwater where salmonid fish are present, which is not to be exceeded more than once every three years on average, is calculated using the following equation: CMC=0.275/(1+10^(7.204 - pH)) + 39.0/(1+10^(pH - 7.204)). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology Spatial Representation: Samples were collected from the mainstem Russian River at 6 locations as follows: (1) at Comminski Station (SWAMP Station ID 114RRCOMM), (2) at Cloverdale (SWAMP Station ID 114RRCLO1), (3) downstream of the Cloverdale Water Treatment Plant (SWAMP Station ID 114CLOSTP), (4) at Geyserville (SWAMP Station ID 114RRGEYS), (5) at Alexander Valley Bridge (SWAMP Station ID 114RRALEX), and (6) at Healdsburg Memorial Beach (SWAMP Station ID 114RRHMB1). Samples were collected from well-mixed flows in glides or riffles. Temporal Representation: At the Comminski Station, Geyserville, and Alexander Valley Bridge sites, samples were collected over 2 site visits at each site during June 2001. At the Cloverdale and Healdsburg Memorial Beach sites, samples were collected over 22 site visits at each site from June 2001 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 6211 Pollutant: Ammonia as Nitrogen LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Migration | Fish Spawning | Freshwater Replenishment | Preservation of Rare & Endangered Species | Warm Freshwater Habitat | Wildlife Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: None of the 2 total ammonia as nitrogen instantaneous grab samples collected from Foss Creek exceed the evaluation guideline. The sample concentrations range from 0.46 to 1.30 mg/l. The samples were collected as part of the Russian River First Flush sampling event. Data are summarized by Katznelson et al. (2003). Data Reference: 2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): "Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses." Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1) Evaluation Guideline: Per the National Recommended Water Quality Criteria (USEPA 2006): The 1-hour average concentration (acute criterion or CMC) of total ammonia nitrogen (in mg N/L) for freshwater where salmonid fish are present, which is not to be exceeded more than once every three years on average, is calculated using the following equation: CMC=0.275/(1+10^(7.204 - pH)) + 39.0/(1+10^(pH - 7.204)). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology Spatial Representation: The samples were collected from 2 sites in Foss Creek as follows: (1) in Foss Creek in downtown Healdsburg, and (2) in Upper Foss Creek. Temporal Representation: The samples were collected on November 7, 2002. At each site, 3 instantaneous grab samples were collected over half hour increments. The data are averaged for each site. Environmental Conditions: Samples were collected during the first runoff event of the rainy season. QAPP Information: Samples were collected in accordance with the study plan and quality control procedures described by Katznelson et al. (2003). QAPP Information Reference(s): 2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 118858 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP Perennial Stream Surveys data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys . SWAMP Data: SWAMP Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114PS0229) Temporal Representation: The samples were collected between the dates of 2013-06-04 and 2013-06-04 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program n="top" width="33%">LOE ID: 323452 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport). Temporal Representation: The samples were collected between the dates of 2017-08-03 and 2019-06-25 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323560 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP Perennial Stream Surveys data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.). Temporal Representation: The samples were collected between the dates of 2015-07-06 and 2015-07-06 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108272 Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup:

DECISION ID

158478

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Antimony
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

"67%">0Data Reference:

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327971

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327967

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4,300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327948

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323564

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108265

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2010-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120076

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4,300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327973

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986)

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2010-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

110928

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114CR0903)

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327944

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327939

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120079

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2010-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120075

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986)

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327972

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4,300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327954

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986)

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327936

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2010-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120078

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2010-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120074

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2010-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

46603

Pollutant:

Ammonia as Nitrogen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986)

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327950

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986)

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327947

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986)

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327943

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

r> Number of Samples: 33 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: None of the 33 ammonia as nitrogen samples collected from the mainstem Russian River exceed the objective. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008). This LOE and LOE 46602 contain data originally evaluated in LOE 26333 from the 2010 Integrated Report cycle, which included data from a site that is not in this water body. The data from LOE 26333 have been split into two LOEs, with data now evaluated under the correct water body. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1) Evaluation Guideline: Per the National Recommended Water Quality Criteria (USEPA 2006): The 1-hour average concentration (acute criterion or CMC) of total ammonia nitrogen (in mg N/L) for freshwater where salmonid fish are present, which is not to be exceeded more than once every three years on average, is calculated using the following equation: CMC=0.275/(1+10^(7.204 - pH)) + 39.0/(1+10^(pH - 7.204)). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology Spatial Representation: Samples were collected from the mainstem Russian River at 5 locations as follows: (1) at Comminski Station (SWAMP Station ID 114RRCOMM), (2) at Cloverdale (SWAMP Station ID 114RRCLO1), (3) downstream of the Cloverdale Water Treatment Plant (SWAMP Station ID 114CLOSTP), (4) at Geyserville (SWAMP Station ID 114RRGEYS) and (5) at Alexander Valley Bridge (SWAMP Station ID 114RRALEX). Samples were collected from well-mixed flows in glides or riffles. Temporal Representation: At the Comminski Station, Geyserville, and Alexander Valley Bridge sites, samples were collected over 2 site visits at each site during June 2001. At the Cloverdale site samples were collected over 22 site visits from June 2001 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 26333 Pollutant: Ammonia as Nitrogen LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Migration | Fish Spawning | Freshwater Replenishment | Preservation of Rare & Endangered Species | Warm Freshwater Habitat | Wildlife Habitat Number of Samples: 55 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: None of the 55 ammonia as nitrogen samples collected from the mainstem Russian River exceed the objective. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008). Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1) Evaluation Guideline: Per the National Recommended Water Quality Criteria (USEPA 2006): The 1-hour average concentration (acute criterion or CMC) of total ammonia nitrogen (in mg N/L) for freshwater where salmonid fish are present, which is not to be exceeded more than once every three years on average, is calculated using the following equation: CMC=0.275/(1+10^(7.204 - pH)) + 39.0/(1+10^(pH - 7.204)). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology Spatial Representation: Samples were collected from the mainstem Russian River at 6 locations as follows: (1) at Comminski Station (SWAMP Station ID 114RRCOMM), (2) at Cloverdale (SWAMP Station ID 114RRCLO1), (3) downstream of the Cloverdale Water Treatment Plant (SWAMP Station ID 114CLOSTP), (4) at Geyserville (SWAMP Station ID 114RRGEYS), (5) at Alexander Valley Bridge (SWAMP Station ID 114RRALEX), and (6) at Healdsburg Memorial Beach (SWAMP Station ID 114RRHMB1). Samples were collected from well-mixed flows in glides or riffles. Temporal Representation: At the Comminski Station, Geyserville, and Alexander Valley Bridge sites, samples were collected over 2 site visits at each site during June 2001. At the Cloverdale and Healdsburg Memorial Beach sites, samples were collected over 22 site visits at each site from June 2001 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 161428, Ammonia	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA


DECISION ID	157540	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Arsenic
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43288

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for arsenic is 33 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43289

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for arsenic is 33 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157540, Arsenic

Region 1


DECISION ID	158478	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Antimony
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327971

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327967

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4,300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327948

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108281

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108284

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108282

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124021

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 21 samples exceed the criterion for Arsenic, Total. Two sample results were not used in this assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 6/22/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124019

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4,300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327973

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986)

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Comminski Station - 114RRCOMM]

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41444

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327944

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327939

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samplesn="top" width="67%">Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108285

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124020

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986)

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327972

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4,300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327954

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986)

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327936

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/21/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124008

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Arsenic, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108287

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Projealign="left" valign="top" width="33%">Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986)

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327950

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986)

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327947

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986)

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158478, Antimony	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327943

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

ct Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323697

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Arsenic.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000)

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323701

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Arsenic.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323689

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):


DECISION ID	157540	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Arsenic
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43288

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for arsenic is 33 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43289

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for arsenic is 33 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1 0">
Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323647

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323709

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Arsenic.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328016

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157540, Arsenic

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108281

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108284

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108282

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327999

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327994

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to conver/td>

LOE ID:

124021

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 6/22/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124019

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 0 samples exceed the critet the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000)

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327988

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157540, Arsenic

Region 1

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Comminski Station - 114RRCOMM]

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41444

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327987

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328003

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be n="top" width="67%">Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108285

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124020

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327997

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157540, Arsenic

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSAMunicipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/21/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124008

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Arsenic, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWA>

LOE ID:

327996

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328020

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

OMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108287

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Projebjective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108283

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323712

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Arsenic.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323704

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323688

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

ct Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323697 Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000) Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323701 Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000) Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323689 Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP


DECISION ID	157541	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Atrazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 41138 has been replaced by LOE 349024 and LOE 41433 has been replaced by LOE 349034 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124022

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Atrazine, Total. Fourteen sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A fo0">

Line of Evidence (LOE) for Decision ID 157540, Arsenic

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323647 Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323709 Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 6/26/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124033 Pollutant: Atrazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Atrazine, Total. Five sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for atrazine is 1 ug/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practi/td> SWAMP Data: SWAMP Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000) Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328016 Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Arsenic. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle Region 1

Line of Evidence (LOE) for Decision ID 157540, Arsenic

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108288

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Atrazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Atrazine is the USEPA Aquatic Life Benchmark of < 1 ug/L for a nonvascular plant (acute). The benchmark was derived from a \less-than\" value (for example, <1,500) and may underestimate toxicity."

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108294

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327999 Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Arsenic. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327994 Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convertd align="left" valign="top" width="33%">Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Atrazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Atrazine is the USEPA Aquatic Life Benchmark of < 1 ug/L for a nonvascular plant (acute). The benchmark was derived from a \less-than\" value (for example, <1,500) and may underestimate toxicity." Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108291 Pollutant: Atrazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Atrazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Atrazine is the USEPA Aquatic Life Benchmark of < 1 ug/L for a nonvascular plant (acute). The benchmark was derived from a \less-than\" value (for example, <1,500) and may underestimate toxicity." Guideline Reference: Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327988 Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Arsenic. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000) Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157540, Arsenic

Region 1

OPP Aquatic Life Benchmarks

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41367

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for atrazine is 1 ug/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108289

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

LOE ID: 327987 Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Arsenic. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000) Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328003 Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be > Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Atrazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for atrazine is 1 ug/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108292 Pollutant: Atrazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Atrazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for atrazine is 1 ug/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representatrepresentative of the dissolved fraction. (California Toxics Rule, 2000) Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327997 Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Arsenic. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000) Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157540, Arsenic

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108295

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Atrazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108296

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Atrazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108293

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Atrazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Spatial Representation:

LOE ID:

327996

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328020

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Oft" valign="top" width="67%">The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108290

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Atrazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323721

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Frabjective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108283

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323712

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Arsenic.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323704

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157540, Arsenic	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323688

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

ction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Atrazine. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for atrazine is 1 ug/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323716 Pollutant: Atrazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Atrazine. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Atrazine is the USEPA Aquatic Life Benchmark of < 1 ug/L for a nonvascular plant (acute). The benchmark was derived from a 'less-than' value (for example, <1,500) and may underestimate toxicity. Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323730 Pollutant: Atrazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Atrazine. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Atrazine is the USEPA Aquatic Life Benchmark of < 1 ug/L for a nonvascular plant (acute). The benchmark was derived from a 'less-than' value (for example, <1,500) and may underestimate toxicity. Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124032 Pollutant: Atrazine LOE Subgroup: Pollutant-Water Matrix: Water Fract


DECISION ID	157541	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Atrazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 41138 has been replaced by LOE 349024 and LOE 41433 has been replaced by LOE 349034 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124022

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Atrazine, Total. Fourteen sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A foion:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Atrazine, Total. Fourteen sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for atrazine is 1 ug/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/26/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349034

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Atrazine.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Atrazine is the USEPA Aquatic Life Benchmark of < 1 ug/L for a nonvascular plant (acute). The benchmark was derived from a 'less-than' value (for example, <1,500) and may underestimate toxicity.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349024

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Prces, fire events, storms, etc.) that are related to these data.

r atrazine is 1 ug/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 6/26/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA


DECISION ID	104199	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Azinphos, Ethyl (Ethyl Guthion)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Six line(s) of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Azinphos-methyl (Guthion)

Line of Evidence (LOE) for Decision ID 104199, Azinphos, Ethyl (Ethyl Guthion)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124045

Pollutant:

Azinphos, Ethyl (Ethyl Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Azinphos Ethyl, Total. Five sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108288

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Atrazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108294

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to National Academy of Sciences Water Quality Criteria (1972), the Azinphos, Ethyl (Ethyl Guthion) criteria is 0.0875 mg/L. (EPA-R3-73-033)

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 104199, Azinphos, Ethyl (Ethyl Guthion)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41324

Pollutant:

Azinphos-methyl (Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The National Recommended Water Quality Criteria for Azinphos Methyl (Guthion) for the protection of freshwater aquatic life is a maximum of 0.01 ug/l.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was td align="left" valign="top" width="33%">Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Atrazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108291

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Atrazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 104199, Azinphos, Ethyl (Ethyl Guthion)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120052

Pollutant:

Azinphos-methyl (Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The National Recommended Water Quality Criteria for Azinphos Methyl (Guthion) for the protection of freshwater aquatic life is a maximum of 0.01 ug/l.

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 104199, Azinphos, Ethyl (Ethyl Guthion)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120051

Pollutant:

OPP Aquatic Life Benchmarks

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41367

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for atrazine is 1 ug/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108289

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The National Recommended Water Quality Criteria for Azinphos Methyl (Guthion) for the protection of freshwater aquatic life is a maximum of 0.01 ug/l.

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 104199, Azinphos, Ethyl (Ethyl Guthion)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124044

Pollutant:

Azinphos, Ethyl (Ethyl Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Azinphos Ethyl, Total. Twenty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to National Academy of Sciences Water Quality Criteria (1972), the Azinphos, Ethyl (Ethyl Guthion) criteria is 0.0875 mg/L. (EPA-R3-73-033)

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 104199, Azinphos, Ethyl (Ethyl Guthion)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120050

Pollutant:

Azinphos-methyl (Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The National Recommended Water Quality Criteria for Azinphos Methyl (Guthion) for the protection of freshwater aquatic life is a maximum of 0.01 ug/l.

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 104199, Azinphos, Ethyl (Ethyl Guthion)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124034

Pollutant:

Azinphos, Ethyl (Ethyl Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Azinphos Ethyl, Total. Twenty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to National Academy of Sciences Water Quality Criteria (1972), the Azinphos, Ethyl (Ethyl Guthion) criteria is 0.0875 mg/L. (EPA-R3-73-033)

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

> Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Atrazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for atrazine is 1 ug/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108292 Pollutant: Atrazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Atrazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for atrazine is 1 ug/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108295 Pollutant: Atrazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Atrazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for atrazine is 1 ug/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108296 Pollutant: Atrazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4

DECISION ID

157559

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Azinphos-methyl (Guthion)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157559, Azinphos-methyl (Guthion)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323737

Pollutant:

Azinphos-methyl (Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The National Recommended Water Quality Criteria for Azinphos Methyl (Guthion) for the protection of freshwater aquatic life is a maximum of 0.01 ug/l.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157559, Azinphos-methyl (Guthion)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323745

Pollutant:

Azinphos-methyl (Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The National Recommended Water Quality Criteria for Azinphos Methyl (Guthion) expressed as a 4-day average for the protection of freshwater aquatic life is a maximum of 0.01 ug/l.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

33%">Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Atrazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Atrazine is the USEPA Aquatic Life Benchmark of < 1 ug/L for a nonvascular plant (acute). The benchmark was derived from a \less-than\" value (for example, <1,500) and may underestimate toxicity." Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108293 Pollutant: Atrazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Atrazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Atrazine is the USEPA Aquatic Life Benchmark of < 1 ug/L for a nonvascular plant (acute). The benchmark was derived from a \less-than\" value (for example, <1,500) and may underestimate toxicity." Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108290 Pollutant: Atrazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Atrazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Atrazine is the USEPA Aquatic Life Benchmark of < 1 ug/L for a nonvascular plant (acute). The benchmark was derived from a \less-than\" value (for example, <1,500) and may underestimate toxicity." Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323721 Pollutant: Atrazine LOE Subgroup: Pollutant-Water Matrix: Water Fra


DECISION ID	158479	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Barium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 158479, Barium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328046

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158479, Barium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328056

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158479, Barium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328061

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124032 Pollutant: Atrazine LOE Subgroup: Pollutant-Water Matrix: Water Fract


DECISION ID	169802	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Bifenthrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 169802, Bifenthrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349049

Pollutant:

Bifenthrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The chronic criterion for bifenthrin is 0.1 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of bifenthrin were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 169802, Bifenthrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349044

Pollutant:

Bifenthrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169802, Bifenthrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43507

Pollutant:

Bifenthrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for bifenthrin is the median lethal concentration (LC50) of 0.43 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.43 ug/g is the geometric mean of LC50 values for bifenthrin from Amweg et al. (2005) and Amweg and Weston (2007).

Guideline Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Guideline Reference:

Water quality criteria report for bifenthrin.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169802, Bifenthrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43506

Pollutant:

Bifenthrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: ll. Pyrethroid insecticides. Reviews of Environmental Contamination and Toxicology 216:51-103.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

ion: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Atrazine, Total. Fourteen sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for atrazine is 1 ug/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 6/26/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 349034 Pollutant: Atrazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Atrazine. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Atrazine is the USEPA Aquatic Life Benchmark of < 1 ug/L for a nonvascular plant (acute). The benchmark was derived from a 'less-than' value (for example, <1,500) and may underestimate toxicity. Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2007-11-26 and 2008-07-14 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157541, Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 349024 Pollutant: Atrazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Atrazine. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Atrazine is the USEPA Aquatic Life Benchmark of < 1 ug/L for a nonvascular plant (acute). The benchmark was derived from a 'less-than' value (for example, <1,500) and may underestimate toxicity. Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2007-11-26 and 2008-07-14 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP


DECISION ID	167486	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Bolstar
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167486, Bolstar	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124046

Pollutant:

Bolstar

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Bolstar, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:


DECISION ID	104199	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Azinphos, Ethyl (Ethyl Guthion)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Six line(s) of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 104199, Azinphos, Ethyl (Ethyl Guthion)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124045

Pollutant:

Azinphos, Ethyl (Ethyl Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Azinphos Ethyl, Total. Five sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Pr444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167486, Bolstar	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124057

Pollutant:

Bolstar

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Bolstar, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167486, Bolstar	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124056

Pollutant:

Bolstar

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Bolstar, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

ogram (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to National Academy of Sciences Water Quality Criteria (1972), the Azinphos, Ethyl (Ethyl Guthion) criteria is 0.0875 mg/L. (EPA-R3-73-033)

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 104199, Azinphos, Ethyl (Ethyl Guthion)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41324

Pollutant:

Azinphos-methyl (Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The National Recommended Water Quality Criteria for Azinphos Methyl (Guthion) for the protection of freshwater aquatic life is a maximum of 0.01 ug/l.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 104199, Azinphos, Ethyl (Ethyl Guthion)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120052

Pollutant:

Azinphos-methyl (Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The National Recommended Water Quality Criteria for Azinphos Methyl (Guthion) for the protection of freshwater aquatic life is a maximum of 0.01 ug/l.

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 104199, Azinphos, Ethyl (Ethyl Guthion)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120051

Pollutant:

DECISION ID

158480

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Boron
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Eleven lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceed the objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 158480, Boron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328071

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Azinphos-methyl (Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The National Recommended Water Quality Criteria for Azinphos Methyl (Guthion) for the protection of freshwater aquatic life is a maximum of 0.01 ug/l.

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 104199, Azinphos, Ethyl (Ethyl Guthion)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124044

Pollutant:

Azinphos, Ethyl (Ethyl Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Azinphos Ethyl, Total. Twenty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Reporft" valign="top" width="67%">Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Drinking water notification levels are published by the Division of Drinking Water. Notification levels are for chemicals for which there is no drinking water MCL. If a notification level is exceeded, local government notification is required and customer notification is recommended. The notification level for Boron is 1 mg/L.

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158480, Boron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328088

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water, including irrigation of various types of crops and stock watering. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The guideline for boron is 700 ug/L (0.7 mg/L).

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to National Academy of Sciences Water Quality Criteria (1972), the Azinphos, Ethyl (Ethyl Guthion) criteria is 0.0875 mg/L. (EPA-R3-73-033)

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 104199, Azinphos, Ethyl (Ethyl Guthion)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120050

Pollutant:

Azinphos-methyl (Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The National Recommended Water Quality Criteria for Azinphos Methyl (Guthion) for the protection of freshwater aquatic life is a maximum of 0.01 ug/l.

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 104199, Azinphos, Ethyl (Ethyl Guthion)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124034

Pollutant:

Azinphos, Ethyl (Ethyl Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Azinphos Ethyl, Total. Twenty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to National Academy of Sciences Water Quality Criteria (1972), the Azinphos, Ethyl (Ethyl Guthion) criteria is 0.0875 mg/L. (EPA-R3-73-033)

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

0%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 158480, Boron

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328084 Pollutant: Boron LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Agricultural Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Boron. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water, including irrigation of various types of crops and stock watering. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The guideline for boron is 700 ug/L (0.7 mg/L). Guideline Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158480, Boron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108301 Pollutant: Boron LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 7 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0


DECISION ID	157559	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Azinphos-methyl (Guthion)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157559, Azinphos-methyl (Guthion)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323737

Pollutant:

Azinphos-methyl (Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The National Recommended Water Quality Criteria for Azinphos Methyl (Guthion) for the protection of freshwater aquatic life is a maximum of 0.01 ug/l.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157559, Azinphos-methyl (Guthion)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323745

Pollutant:

Azinphos-methyl (Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The National Recommended Water Quality Criteria for Azinphos Methyl (Guthion) expressed as a 4-day average for the protection of freshwater aquatic life is a maximum of 0.01 ug/l.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

of 7 samples exceeded the water quality standard for Boron. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Drinking water notification levels are published by the Division of Drinking Water. Notification levels are for chemicals for which there is no drinking water MCL. If a notification level is exceeded, local government notification is required and customer notification is recommended. The notification level for Boron is 1 mg/L. Guideline Reference: Drinking Water Notification and Response Levels: An Overview Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-09-28 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 158480, Boron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108299 Pollutant: Boron LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 7 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Boron. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Drinking water notification levels are published by the Division of Drinking Water. Notification levels are for chemicals for which there is no drinking water MCL. If a notification level is exceeded, local government notification is required and customer notification is recommended. The notification level for Boron is 1 mg/L. Guideline Reference: Drinking Water Notification and Response Levels: An Overview Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-09-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 158480, Boron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 34205 Pollutant: Boron LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Agricultural Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants) Data Used to Assess Water Quality: None of the 4 samples analyzed exceeded the evaluation guideline of 0.7 mg/L. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin (NCRWQCB 2011): Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water, including irrigation of various types of crops and stock watering. At or below the limits presented in the Water Quality Goals tables, agricultural uses of water should not be limited. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The criteria for boron is 700 ug/L (0.7 mg/L). Guideline Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) Spatial Representation: Samples were collected from the Russian River at Crocker Road station (114RR5652). Temporal Representation: Samples were collected approximately quarterly from November 2007 to July 2008. Environmental Conditions: QAPP Information: SWAMP QAPP QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 158480, Boron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108300 Pollutant: Boron LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total


DECISION ID	158479	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Barium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 158479, Barium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328046

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158479, Barium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328056

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158479, Barium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328061

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Beneficial Use: Agricultural Supply Number of Samples: 7 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Boron. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water, including irrigation of various types of crops and stock watering. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The guideline for boron is 700 ug/L (0.7 mg/L). Guideline Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-09-28 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 158480, Boron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108298 Pollutant: Boron LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Agricultural Supply Number of Samples: 7 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Boron. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water, including irrigation of various types of crops and stock watering. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The guideline for boron is 700 ug/L (0.7 mg/L). Guideline Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-09-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 158480, Boron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328079 Pollutant: Boron LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Agricultural Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Boron. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water, including irrigation of various types of crops and stock watering. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The guideline for boron is 700 ug/L (0.7 mg/L). Guideline Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158480, Boron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328081 Pollutant: Boron LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Boron. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Drinking water notification levels are published by the Division of Drinking Water. Notification levels are for chemicals for which there is no drinking water MCL. If a notification level is exceeded, local government notification is required and customer notification is recommended. The notification level for Boron is 1 mg/L. Guideline Reference: Drinking Water Notification and Response Levels: An Overview Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158480, Boron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328080 Pollutant: Boron LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Boron. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Drinking water notification levels are published by the Division of Drinking Water. Notification levels are for chemicals for which there is no drinking water MCL. If a notification level is exceeded, local government notification is required and customer notification is recommended. The notification level for Boron is 1 mg/L. Guideline Reference: Drinking Water Notification and Response Levels: An Overview Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle


DECISION ID	169802	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Bifenthrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 169802, Bifenthrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349049

Pollutant:

Bifenthrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The


DECISION ID	103956	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Boscalid
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. None samples exceed the objectives. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 103956, Boscalid	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120891

Pollutant:

Boscalid

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed NWIS data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Boscalid.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Boscalid is the USEPA Aquatic Life Benchmark of 116 ug/L for a fish (chronic).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (USGS-11463682)

Temporal Representation:

The samples were collected between the dates of 2016-10-28 and 2016-10-28

Environmental Conditions:

QAPP Information:

QAPP not required for federal data

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 103956, Boscalid	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120869

Pollutant:

Boscalid

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Boscalid is the USEPA Aquatic Life Benchmark of 116 ug/L for a fish (chronic).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (USGS-11463682)

Temporal Representation:

The samples were collected between the dates of 2016-10-28 and 2016-10-28

Environmental Conditions:

QAPP Information:

QAPP not required for federal data

QAPP Information Reference(s):

chronic criterion for bifenthrin is 0.1 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of bifenthrin were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 169802, Bifenthrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349044

Pollutant:

Bifenthrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169802, Bifenthrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43507

Pollutant:

Bifenthrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Guideline Reference:

Water quality criteria report for bifenthrin.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169802, Bifenthrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43506

Pollutant:

Bifenthrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: ll. Pyrethroid insecticides. Reviews of Environmental Contamination and Toxicology 216:51-103.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan


DECISION ID	167486	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Bolstar
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167486, Bolstar	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124046

Pollutant:

Bolstar

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Bolstar, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:


DECISION ID	158487	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Bromide
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 158487, Bromide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120777

Pollutant:

Bromide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science Health Advisory water quality objective for Bromide is 2300 ug/L.

Guideline Reference:

National Academy of Sciences, Drinking Water and Health, Volume 3 (1980)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (USGS-11463980)

Temporal Representation:

The samples were collected between the dates of 2011-07-28 and 2011-07-28

Environmental Conditions:

QAPP Information:

QAPP not required for federal data

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 158487, Bromide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328092

Pollutant:

Bromide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science Health Advisory water quality objective for Bromide is 2300 ug/L.

Guideline Reference:

National Academy of Sciences, Drinking Water and Health, Volume 3 (1980)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158487, Bromide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328096

Pollutant:

Bromide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science Health Advisory water quality objective for Bromide is 2300 ug/L.

Guideline Reference:

National Academy of Sciences, Drinking Water and Health, Volume 3 (1980)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167486, Bolstar	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124057

Pollutant:

Bolstar

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Bolstar, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167486, Bolstar	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124056

Pollutant:

Bolstar

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Bolstar, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	157542	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Cadmium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108304

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Cadmium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.

Objective/Criterion Reference:

DECISION ID

158480

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Boron
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Eleven lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceed the objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

tant-Watersp;

Line of Evidence (LOE) for Decision ID 158480, Boron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328071

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108302

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Cadmium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE Ift" valign="top" width="67%">Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158480, Boron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328088

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158480, Boron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328084

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158480, Boron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108301

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0D:

323864

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Cadmium.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The dissolved cadmium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.2 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323861

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Cadmium.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323906

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Cadmium.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323859

Pollutant:

Cadmium

LOE Subgroup:

Pollu of 7 samples exceeded the water quality standard for Boron.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 158480, Boron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108299

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Boron.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 158480, Boron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

34205

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the 4 samples analyzed exceeded the evaluation guideline of 0.7 mg/L.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin (NCRWQCB 2011): Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use.

Objective/Criterion Reference:

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water, including irrigation of various types of crops and stock watering. At or below the limits presented in the Water Quality Goals tables, agricultural uses of water should not be limited. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The criteria for boron is 700 ug/L (0.7 mg/L).

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Samples were collected from the Russian River at Crocker Road station (114RR5652).

Temporal Representation:

Samples were collected approximately quarterly from November 2007 to July 2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 158480, Boron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108300

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323869

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323918

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323919

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Boron.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 158480, Boron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108298

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Boron.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

&nbign="left" valign="top" width="67%">2

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Cadmium.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323891

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

Evaluation Guideline:

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 158480, Boron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328079

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158480, Boron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328081

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158480, Boron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328080

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 41149 Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Cadmium. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L. Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124071 Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 21 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 21 samples exceed the criterion for Cadmium, Total. Two sample results were not used in this assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 6/22/2001-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA


DECISION ID	103956	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Boscalid
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. None samples exceed the objectives. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 103956, Boscalid	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120891

Pollutant:

Boscalid

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Boscalid is the USEPA Aquatic Life Benchmark of 116 ug/L for a fish (chronic).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (USGS-11463682)

Temporal Representation:

The samples were collected between the dates of 2016-10-28 and 2016-10-28

Environmental Conditions:

QAPP Information:

QAPP not required for federal data

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 103956, Boscalid	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120869

Pollutant:

Boscalid

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Boscalid is the USEPA Aquatic Life Benchmark of 116 ug/L for a fish (chronic).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (USGS-11463682)

Temporal Representation:

The samples were collected between the dates of 2016-10-28 and 2016-10-28

Environmental Conditions:

QAPP Information:

QAPP not required for federal data

QAPP Information Reference(s):

tr> Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-09-28 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124069 Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: Two sample results were not used in this assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Comminski Station - 114RRCOMM] Temporal Representation: Data was collected over the time period 6/21/2001-6/25/2001. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124070 Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 21 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 21 samples exceed the criterion for Cadmium, Total. Two sample results were not used in this assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 6/21/2001-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124058 Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 5

DECISION ID

158487

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Bromide
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 158487, Bromide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120777

Pollutant:

Bromide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science Health Advisory water quality objective for Bromide is 2300 ug/L.

Guideline Reference:

National Academy of Sciences, Drinking Water and Health, Volume 3 (1980)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (USGS-11463980)

Temporal Representation:

The samples were collected between the dates of 2011-07-28 and 2011-07-28

Environmental Conditions:

QAPP Information:

QAPP not required for federal data

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 158487, Bromide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328092

Pollutant:

Bromide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science Health Advisory water quality objective for Bromide is 2300 ug/L.

Guideline Reference:

National Academy of Sciences, Drinking Water and Health, Volume 3 (1980)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158487, Bromide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328096

Pollutant:

Bromide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science Health Advisory water quality objective for Bromide is 2300 ug/L.

Guideline Reference:

National Academy of Sciences, Drinking Water and Health, Volume 3 (1980)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

align="top" width="33%">Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Cadmium, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108306 Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-09-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108303 Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-09-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108305 Pollutant:

DECISION ID

157542

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Cadmium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108304

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Cadmium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Cadmium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43675

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for cadmium is 4.98 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43676

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for cadmium is 4.98 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33201

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for cadmium.

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples collected between 11/26/2007 and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

/water_issues/programs/tmdl/records/state_board/2003/ref476.pdf" >Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-09-28 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108302 Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-09-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323864 Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Cadmium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The dissolved cadmium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.2 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323861 Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Cadmium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The dissolved cadmium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.2 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment


DECISION ID	157543	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Carbaryl
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157543, Carbaryl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Carbaryl.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Water Quality Control Plan (Basin Plan) for the North Coast Region

The USEPA Health Advisory for carbaryl as a drinking water level with a one in a million cancer risk is 0.04 mg/L.

2012 Edition of the Drinking Water Standards and Health Advisories

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157543, Carbaryl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Carbaryl.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan, North Coast Basin: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Water Quality Control Plan (Basin Plan) for the North Coast Region

The USEPA national ambient water quality criterion for freshwater aquatic life criterion continuous concentration expressed as a 4 day average for carbaryl is 2.1 µg/L.

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157543, Carbaryl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

323926

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

The samples were collected between the dates of 2017-12-14 and 2017-12-20

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Cadmium.

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

The samples were collected between the dates of 2017-12-14 and 2017-12-20

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

Pollu valign="top" width="67%">Carbaryl

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Carbaryl.

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Water Quality Control Plan (Basin Plan) for the North Coast Region

The USEPA Health Advisory for carbaryl as a drinking water level with a one in a million cancer risk is 0.04 mg/L.

2012 Edition of the Drinking Water Standards and Health Advisories

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

The samples were collected between the dates of 2014-02-03 and 2014-02-03

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

Line of Evidence (LOE) for Decision ID 157543, Carbaryl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Carbaryl.

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Water Quality Control Plan (Basin Plan) for the North Coast Region

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

The samples were collected between the dates of 2017-12-20 and 2017-12-20

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Water Quality Control Plan (Basin Plan) for the North Coast Region

The USEPA National Recommended Aquatic Life criteria pursuant to Section 304(a) of the Clean Water Act for Carbaryl is 2.1 ug/L.

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

The samples were collected between the dates of 2014-02-03 and 2014-02-03

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

Line of Evidence (LOE) for Decision ID 157543, Carbaryl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Carbaryl.

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Water Quality Control Plan (Basin Plan) for the North Coast Region

The USEPA national ambient water quality criterion for freshwater aquatic life criterion continuous concentration expressed as a 4 day average for carbaryl is 2.1 ug/L.

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

The samples were collected between the dates of 2014-02-03 and 2014-02-03

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

Line of Evidence (LOE) for Decision ID 157543, Carbaryl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Carbaryl.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Water Quality Control Plan (Basin Plan) for the North Coast Region

The USEPA National Recommended Aquatic Life criteria pursuant to Section 304(a) of the Clean Water Act for Carbaryl is 2.1 ug/L.

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

ign="left" valign="top" width="33%">Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323918 Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323919 Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples:

DECISION ID

167487

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Carbendazim
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167487, Carbendazim	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120838

Pollutant:

Carbendazim

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Carbendazim is the USEPA Aquatic Life Benchmark of 0.99 ug/L for a fish (chronic).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (USGS-11463682)

Temporal Representation:

The samples were collected between the dates of 2016-10-28 and 2016-10-28

Environmental Conditions:

QAPP Information:

QAPP not required for federal data

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167487, Carbendazim	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120941

Pollutant:

Carbendazim

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Carbendazim is the USEPA Aquatic Life Benchmark of 0.99 ug/L for a fish (chronic).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (USGS-11463682)

Temporal Representation:

The samples were collected between the dates of 2016-10-28 and 2016-10-28

Environmental Conditions:

QAPP Information:

QAPP not required for federal data

QAPP Information Reference(s):

ign="left" valign="top" width="67%">2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Cadmium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The dissolved cadmium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.2 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323891 Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108307 Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-09-28 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evid


DECISION ID	157544	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Carbofuran
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157544, Carbofuran	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323944

Pollutant:

Carbofuran

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Carbofuran.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Carbofuran is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertibrate (chronic).

Guideline Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124070

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 21 samples exceed the criterion for Cadmium, Total. Two sample results were not used in this assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/21/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124058

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

OPP Aquatic Life Benchmarks

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157544, Carbofuran	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323943

Pollutant:

Carbofuran

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Carbofuran.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Carbofuran is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertibrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157544, Carbofuran	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323947

Pollutant:

Carbofuran

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Carbofuran.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for Carbofuran incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.018 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157544, Carbofuran	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108312

Pollutant:

Carbofuran

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Carbofuran.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for Carbofuran incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.018 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108305 Pollutant:

DECISION ID

157602

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Carbophenothion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157602, Carbophenothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108313

Pollutant:

Carbophenothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Carbophenothion.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Drinking water notification levels are published by the Division of Drinking Water and are for chemicals for which there is no drinking water MCL. If a notification level is exceeded, local government notification is required and customer notification is recommended. The criteria for Carbophenothion (Trithion) is 0.007 mg/L.

Guideline Reference:

CDPH Archived Advisory Levels for Drinking Water. Archived Advisory Levels are currently considered Notification Levels.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157602, Carbophenothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108315

Pollutant:

Carbophenothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Carbophenothion.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

CDPH Archived Advisory Levels for Drinking Water. Archived Advisory Levels are currently considered Notification Levels.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157602, Carbophenothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108314

Pollutant:

Carbophenothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Carbophenothion.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

CDPH Archived Advisory Levels for Drinking Water. Archived Advisory Levels are currently considered Notification Levels.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157602, Carbophenothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323959

Pollutant:

Carbophenothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Carbophenothion.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

CDPH Archived Advisory Levels for Drinking Water. Archived Advisory Levels are currently considered Notification Levels.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

width="67%">Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-09-28 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 43675 Pollutant: Cadmium LOE Subgroup: Pollutant-Sediment Matrix: Sediment Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Cadmium. Data Reference: Statewide Stream Pollution Trends Study 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for cadmium is 4.98 mg/Kg dry weight (MacDonald et al. 2000). Guideline Reference: Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ] Temporal Representation: Data was collected on a single day 10/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 43676 Pollutant: Cadmium LOE Subgroup: Pollutant-Sediment Matrix: Sediment Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Cadmium. Data Reference: Statewide Stream Pollution Trends Study 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for cadmium is 4.98 mg/Kg dry weight (MacDonald et al. 2000). Guideline Reference: Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ] Temporal Representation: Data was collected on a single day 10/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157542, Cadmium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 33201 Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: None of the 4 samples exceeded the hardness based criteria calculated for cadmium. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Samples collected at station 114RR5652 (Russian River at Crocker Road). Temporal Representation: Samples collected between 11/26/2007 and 7/14/2008. Environmental Conditions: QAPP Information: SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan


DECISION ID	157545	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Chlordane
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157545, Chlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33098

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

The method detection limit for all 3 of the non-detect samples was greater than the criteria and thus the data were not used in this assessment. Total chlordane is assessed as the sum of cis-chlordane, trans-chlordane, cis-nonachlor, trans-nonachlor, and oxychlordane.

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Basin Plan for the Regional Water Quality Control Board, North Coast Region states that all waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (NCRWQCB 2011).The total chlordane criterion for the protection of human health from the consumption of water and organisms is 0.00057 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:


DECISION ID	157543	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Carbaryl
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

The USEPA National Recommended Aquatic Life criteria pursuant to Section 304(a) of the Clean Water Act for Carbaryl is 2.1 ug/L.

Line of Evidence (LOE) for Decision ID 157543, Carbaryl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108310

Pollutant:

Carbaryl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Carbaryl.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for carbaryl as a drinking water level with a one in a million cancer risk is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157543, Carbaryl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108309

Pollutant:

Carbaryl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Carbaryl.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life criterion continuous concentration expressed as a 4 day average for carbaryl is 2.1 µg/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157543, Carbaryl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323926

Pollutant:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652; Russian River at Crocker Road

Temporal Representation:

Samples collected between 11/26/2007 and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157545, Chlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114508

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Total Chlordanes.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The chlordane criterion for the protection of human health from the consumption of water and organisms is 0.00057 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157545, Chlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322410

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Carbaryl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Carbaryl.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for carbaryl as a drinking water level with a one in a million cancer risk is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157543, Carbaryl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323929

Pollutant:

Carbaryl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Carbaryl.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science guidelines (NAS 1972) establish a maximum total Chlordane concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157545, Chlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322418

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157543, Carbaryl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323932

Pollutant:

Carbaryl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Carbaryl.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life criterion continuous concentration expressed as a 4 day average for carbaryl is 2.1 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157543, Carbaryl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108311

Pollutant:

Carbaryl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Carbaryl.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA National Recommended Aquatic Life criteria pursuant to Section 304(a) of the Clean Water Act for Carbaryl is 2.1 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

td align="left" valign="top" width="33%">Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157545, Chlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33009

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 3 samples exceeded the criterion continuous concentration for chlordane (total). Total chlordane is assessed as the sum of cis-chlordane, trans-chlordane, cis-nonachlor, trans-nonachlor, and oxychlordane.

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Basin Plan for the Regional Water Quality Control Board, North Coast Region states that all waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (NCRWQCB 2011). The chlordane criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0043 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652; Russian River at Crocker Road

Temporal Representation:

Samples collected between 11/26/2007 and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157545, Chlordane


DECISION ID	167487	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Carbendazim
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167487, Carbendazim	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120838

Pollutant:

Carbendazim

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Carbendazim is the USEPA Aquatic Life Benchmark of 0.99 ug/L for a fish (chronic).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (USGS-11463682)

Temporal Representation:

The samples were collected between the dates of 2016-10-28 and 2016-10-28

Environmental Conditions:

QAPP Information:

QAPP not required for federal data

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167487, Carbendazim	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120941

Pollutant:

Carbendazim

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Carbendazim is the USEPA Aquatic Life Benchmark of 0.99 ug/L for a fish (chronic).

Guideline Reference:

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (USGS-11463682)

Temporal Representation:

The samples were collected between the dates of 2016-10-28 and 2016-10-28

Environmental Conditions:

QAPP Information:

QAPP not required for federal data

QAPP Information Reference(s):

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33702

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Zero of 1 sample collected did not exceed the criteria for chlordane concentration (Sum of trans-Chlordane, cis-Chlordane, cis-Nonachlor, trans-Nonachlor, and Oxychlordane).

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The Probable Effect Concentration for Chlordane in freshwater sediments is 17.6 ug/kg.

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected at the following station 114RRAXRV (Russian River at Alexander RV Park).

Temporal Representation:

One sample was collected on 10/14/2008.

Environmental Conditions:

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157545, Chlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114510

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Total Chlordanes.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The chlordane criterion for the protection of human health from the consumption of water and organisms is 0.00057 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157545, Chlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114509

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Total Chlordanes.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Chlordane criterion continuous concentration expressed as a 4-day average for the protection of aquatic life in california waters is 0.0043 ug/L (California Toxics Rule, 2000)

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157545, Chlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114507

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Total Chlordanes.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Chlordane criterion continuous concentration expressed as a 4-day average for the protection of aquatic life in california waters is 0.0043 ug/L (California Toxics Rule, 2000)

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157545, Chlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322398

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The modified OEHHA Fish Contaminant Goal for total chlordane in fish tissue is 3.9 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008)

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1


DECISION ID	157544	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Carbofuran
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157544, Carbofuran	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323944

Pollutant:

Carbofuran

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Carbofuran.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Carbofuran is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertibrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157544, Carbofuran	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323943

Pollutant:

Carbofuran

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Carbofuran.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Carbofuran is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertibrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157544, Carbofuran	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323947

Pollutant:

Carbofuran

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Carbofuran.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for Carbofuran incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.018 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157544, Carbofuran	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108312

Pollutant:

Carbofuran

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Carbofuran.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for Carbofuran incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.018 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	157546	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Chloride
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328108

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The chloride criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 230000 ug/L (230 mg/L)(USEPA National Recommended Water Quality Criteria, 2006).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328200

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-05-01 and 2017-05-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157546, Chloride

DECISION ID	157602	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Carbophenothion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157602, Carbophenothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108313

Pollutant:

Carbophenothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Carbophenothion.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Drinking water notification levels are published by the Division of Drinking Water and are for chemicals for which there is no drinking water MCL. If a notification level is exceeded, locDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: right; PADDING-TOP: 3px; font-smooth: always">Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324045

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324001

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chloride.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Regal government notification is required and customer notification is recommended. The criteria for Carbophenothion (Trithion) is 0.007 mg/L.

Guideline Reference:

CDPH Archived Advisory Levels for Drinking Water. Archived Advisory Levels are currently considered Notification Levels.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157602, Carbophenothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108315

Pollutant:

Carbophenothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Carbophenothion.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

CDPH Archived Advisory Levels for Drinking Water. Archived Advisory Levels are currently considered Notification Levels.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157602, Carbophenothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108314

Pollutant:

Carbophenothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Carbophenothion.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

CDPH Archived Advisory Levels for Drinking Water. Archived Advisory Levels are currently considered Notification Levels.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157602, Carbophenothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323959

Pollutant:

Carbophenothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Carbophenothion.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

CDPH Archived Advisory Levels for Drinking Water. Archived Advisory Levels are currently considered Notification Levels.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

ion (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 324034 Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP Perennial Stream Surveys data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chloride. Data Reference: Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The chloride criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 230000 ug/L (230 mg/L)(USEPA National Recommended Water Quality Criteria, 2006). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.). Temporal Representation: The samples were collected between the dates of 2015-07-06 and 2015-07-06 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 323985 Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chloride. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The chloride criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 230000 ug/L (230 mg/L)(USEPA National Recommended Water Quality Criteria, 2006). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 119917 Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP Perennial Stream Surveys data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114PS0229) Temporal Representation: The samples were collected between the dates of 2013-06-04 and 2013-06-04 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328189 Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed EPA National Aquatic Resources Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chloride. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River). Temporal Representation: The samples were collected between the dates of 2013-08-26 and 2013-09-25 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157546, Chloride

DECISION ID	157545	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Chlordane
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157545, Chlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33098

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652; Russian River at Crocker Road

Temporal Representation:

Samples collected between 11/26/2007 and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157545, Chlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114508

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Total Chlordanes.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The chlordane criterion for the protection of human health from the consumption of water and organisms is 0.00057 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157545, Chlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322410

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328192 Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chloride. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108321 Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 107139 Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed DFW_ABL_Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Chloride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring. SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114CR0903) Temporal Representation: The samples were collected between the dates of 2013-08-26 and 2013-09-25 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157546, Chloride

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157545, Chlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322418

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157545, Chlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33009

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Basin Plan for the Regional Water Quality Control Board, North Coast Region states that all waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (NCRWQCB 2011). The chlordane criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0043 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652; Russian River at Crocker Road

Temporal Representation:

Samples collected between 11/26/2007 and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157545, Chlordane

td>

LOE ID:

120911

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (USGS-11463980)

Temporal Representation:

The samples were collected between the dates of 2011-07-28 and 2011-07-28

Environmental Conditions:

QAPP Information:

QAPP not required for federal data

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108316

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Chloride.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108322

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Chloride.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

25448

Pollutant:

ChloridRegion 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 33702 Pollutant: Chlordane LOE Subgroup: Pollutant-Sediment Matrix: Sediment Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Zero of 1 sample collected did not exceed the criteria for chlordane concentration (Sum of trans-Chlordane, cis-Chlordane, cis-Nonachlor, trans-Nonachlor, and Oxychlordane). Data Reference: Statewide Stream Pollution Trends Study 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Waters shall not contain substances in concentrations that result in deposition of material that causes nuisance or adversely affect beneficial uses. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The Probable Effect Concentration for Chlordane in freshwater sediments is 17.6 ug/kg. Guideline Reference: Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 Spatial Representation: Data were collected at the following station 114RRAXRV (Russian River at Alexander RV Park). Temporal Representation: One sample was collected on 10/14/2008. Environmental Conditions: QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157545, Chlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 114510 Pollutant: Chlordane LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Total Chlordanes. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Wate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Not Recorded Beneficial Use: Municipal & Domestic Supply Number of Samples: 50 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: None of the 50 chloride samples collected in the mainstem Russian River exceed the evaluation guideline. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008). Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1) Evaluation Guideline: Per 22 CCR 64449: The recommended Secondary Maximum Contaminant Level for chloride is 250 mg/L. Guideline Reference: Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations Spatial Representation: Samples were collected from the mainstem Russian River at 6 locations as follows: (1) at Comminski Station (SWAMP Station ID 114RRCOMM), (2) at Cloverdale (SWAMP Station ID 114RRCLO1), (3) at Geyserville (SWAMP Station ID 114RRGEYS), (4) at Alexander Valley Bridge (SWAMP Station ID 114RRALEX), and (5) at Healdsburg Memorial Beach (SWAMP Station ID 114RRHMB1). Samples were collected from well-mixed flows in glides or riffles. Temporal Representation: At the Comminski Station, Geyserville, and Alexander Valley Bridge sites, samples were collected over 2 site visits at each site during June 2001. At the Cloverdale and Healdsburg Memorial Beach sites, samples were collected over 22 site visits at each site from June 2001 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 33855 Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Not Recorded Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: None of the 4 samples collected exceeded the evaluation guideline. Data Reference: The chlordane criterion for the protection of human health from the consumption of water and organisms is 0.00057 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157545, Chlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 114509 Pollutant: Chlordane LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Total Chlordanes. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The Chlordane criterion continuous concentration expressed as a 4-day average for the protection of aquatic life in california waters is 0.0043 ug/L (California Toxics Rule, 2000) Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157545, Chlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 114507 Pollutant: Chlordane LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Total Chlordanes. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The Chlordane criterion continuous concentration expressed as a 4-day average for the protection of aquatic life in california waters is 0.0043 ug/L (California Toxics Rule, 2000) Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157545, Chlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 322398 Pollutant: Chlordane LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of 3 samples exceeded the water quality threshold for Chlordane. Monitors collected 3 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish, 1 composite of Sacramento Sucker composed of 10 fish, and 1 composite of Smallmouth Bass composed of 6 fish. Because no composites were collected within the same averaging period, these composites represent 3 independent samples. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The modified OEHHA Fish Contaminant Goal for total chlordane in fish tissue is 3.9 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008) Guideline Reference: Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene Spatial Representation: Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP). Temporal Representation: Data for this line of evidence were collected between 2015-08-03 and 2015-08-03. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes. Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP rboards.ca.gov/water_issues/programs/tmdl/records/region_1/2010/ref3792.xls">RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Per 22 CCR 64449: The recommended Secondary Maximum Contaminant Level for chloride is 250 mg/L. Guideline Reference: Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations Spatial Representation: Samples were collected from the Russian River at Crocker Road station (114RR5652). Temporal Representation: Samples were collected approximately once per quarter year from November 2007 to July 2008. Environmental Conditions: QAPP Information: SWAMP QAPP QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 46519 Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Not Recorded Beneficial Use: Municipal & Domestic Supply Number of Samples: 33 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: None of the 33 chloride samples collected from the mainstem Russian River exceed the objective. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008). This LOE and LOE 46518 contain data originally evaluated in LOE 25448, which included data from a site that is not in this water body. The data from LOE 25448 have been split into two LOEs, with data now evaluated under the correct water body. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses. Objective/Criterion Reference: Revised Draft of the 2007 Review of the Monitoring Data for the Irrigated Lands Regulatory Conditional Waiver Program Evaluation Guideline: Per 22 CCR 64449: The recommended Secondary Maximum Contaminant Level for chloride is 250 mg/L. Guideline Reference: Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations Spatial Representation: Samples were collected from the mainstem Russian River at 5 locations as follows: (1) at Comminski Station (SWAMP Station ID 114RRCOMM), (2) at Cloverdale (SWAMP Station ID 114RRCLO1), (3) downstream of the Cloverdale Water Treatment Plant (SWAMP Station ID 114CLOSTP), (4) at Geyserville (SWAMP Station ID 114RRGEYS) and (5) at Alexander Valley Bridge (SWAMP Station ID 114RRALEX). Samples were collected from well-mixed flows in glides or riffles. Temporal Representation: At the Comminski Station, Geyserville, and Alexander Valley Bridge sites, samples were collected over 2 site visits at each site during June 2001. At the Cloverdale site samples were collected over 22 site visits from June 2001 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 324062 Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chloride. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The chloride criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 230000 ug/L (230 mg/L)(USEPA National Recommended Water Quality Criteria, 2006). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road). Temporal Representation: The samples were collected between the dates of 2019-01-16 and 2019-01-16 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157546, Chloride

Region 1

Russian River HU, Middle Russian River


DECISION ID	157546	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Chloride
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328108

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328200

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-05-01 and 2017-05-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157546, Chloride

LOE ID:

324009

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chloride.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328155

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328148

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed EPA National Aquatic Resources Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chloride.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River).

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324045

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324001

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chloride.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324034

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328193

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-05-01 and 2017-05-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328133

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328115

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328131

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: right; PADDING-TOP: 3px; font-smooth: always">Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323985

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chloride.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

119917

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Q


DECISION ID	157547	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Chlorophyll-a
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157547, Chlorophyll-a	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chlorophyll a.

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses. (Basin Plan, 2018)

Water Quality Control Plan (Basin Plan) for the North Coast Region

North Carolina Administrative code (NCAC), Title 15ANAEnvironmental and Natural Resources, Subchapter 2B-Surface water and wetland standards, Rule 0211-Fresh surface water quality standards for class C waters (Class C is defined as freshwaters protected for secondary recreation, fishing, aquatic life including propagation and survival, and wildlife).Section 3(a) of Rule 0211 applies to all fresh surface waters and states that chlorophyll a is not to exceed 40 ug/L.

North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

The samples were collected between the dates of 2014-02-03 and 2014-02-03

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

Line of Evidence (LOE) for Decision ID 157547, Chlorophyll-a	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chlorophyll a.

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Water Quality Control Plan (Basin Plan) for the North Coast Region

North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

The samples were collected between the dates of 2014-02-03 and 2014-02-03

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

uality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114PS0229)

Temporal Representation:

The samples were collected between the dates of 2013-06-04 and 2013-06-04

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328189

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed EPA National Aquatic Resources Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chloride.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River).

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157546, Chloride

DECISION ID	157548	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Chlorpyrifos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Thirteen lines of evidence are available in the administrative record to assess this pollutant. One of one sample exceeds the None fraction of water Municipal & Domestic Supply beneficial use objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of one sample exceeds the None fraction of water Municipal & Domestic Supply beneficial use objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. While two samples in line of evidence 124072 did exceed the objective for the MUN beneficial use, these two samples were not spatially or temporally independent of each other and will therefore be counted as a single sample.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:	While two samples in line of evidence 124072 did exceed the objective for the MUN beneficial use, these two samples were not spatially or temporally independent of each other and will therefore be counted as a single sample.

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:	Two samples have exceedances for the MUN beneficial use; however these samples are not temporally or spatially independent and will therefore be treated as a single sample.

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

113944

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328192

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108321

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

107139

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114CR0903)

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157546, Chloride

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater criterion continuous concentration to protect aquatic organisms is 0.014 ug/L (Siepmann and Finlayson 2000).

Guideline Reference:

Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41152

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The freshwater criterion continuous concentration to protect aquatic organisms is 0.015 ug/L (Siepmann and Finlayson 2000, with minor corrections to significant figures as described in Beaulaurier et al., 2005).

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108329

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Chlorpyrifos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water health advisory for chlorpyrifos is 2 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108330

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chlorpyrifos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water health advisory for chlorpyrifos is 2 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108332

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Chlorpyrifos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water health advisory for chlorpyrifos is 2 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates oftd>

LOE ID:

120911

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (USGS-11463980)

Temporal Representation:

The samples were collected between the dates of 2011-07-28 and 2011-07-28

Environmental Conditions:

QAPP Information:

QAPP not required for federal data

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108316

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Chloride.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108322

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Chloride.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

25448

Pollutant:

Chlorid 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43524

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for chlorpyrifos is the median lethal concentration (LC50) of 1.77 ug/g and is normalized by the percentage of organic carbon in the sediment sample (Amweg and Weston, 2007).

Guideline Reference:

Whole-sediment toxicity identification evaluation tools for pyrethroid insecticides: I. piperonyl butoxide addition. Environ. Toxicol. Chem. 26:2389-2396.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43525

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 50 chloride samples collected in the mainstem Russian River exceed the evaluation guideline. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008).

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Per 22 CCR 64449: The recommended Secondary Maximum Contaminant Level for chloride is 250 mg/L.

Guideline Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Spatial Representation:

Samples were collected from the mainstem Russian River at 6 locations as follows: (1) at Comminski Station (SWAMP Station ID 114RRCOMM), (2) at Cloverdale (SWAMP Station ID 114RRCLO1), (3) at Geyserville (SWAMP Station ID 114RRGEYS), (4) at Alexander Valley Bridge (SWAMP Station ID 114RRALEX), and (5) at Healdsburg Memorial Beach (SWAMP Station ID 114RRHMB1). Samples were collected from well-mixed flows in glides or riffles.

Temporal Representation:

At the Comminski Station, Geyserville, and Alexander Valley Bridge sites, samples were collected over 2 site visits at each site during June 2001. At the Cloverdale and Healdsburg Memorial Beach sites, samples were collected over 22 site visits at each site from June 2001 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33855

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples collected exceeded the evaluation guideline.

Data Reference:

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for chlorpyrifos is the median lethal concentration (LC50) of 1.77 ug/g and is normalized by the percentage of organic carbon in the sediment sample (Amweg and Weston, 2007).

Guideline Reference:

Whole-sediment toxicity identification evaluation tools for pyrethroid insecticides: I. piperonyl butoxide addition. Environ. Toxicol. Chem. 26:2389-2396.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124072

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA5 to determine beneficial use support and results are as follows: 2 of 2 samples exceed the criterion for Chlorpyrifos, Total. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The USEPA Health Advisory for life time exposure to Chlorpyrifos is 0.002 mg/L (EPA 820-R-11-002 Drinking Water Standards and Health Advisories, 2011).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Per 22 CCR 64449: The recommended Secondary Maximum Contaminant Level for chloride is 250 mg/L.

Guideline Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Spatial Representation:

Samples were collected from the Russian River at Crocker Road station (114RR5652).

Temporal Representation:

Samples were collected approximately once per quarter year from November 2007 to July 2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

46519

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 33 chloride samples collected from the mainstem Russian River exceed the objective. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008). This LOE and LOE 46518 contain data originally evaluated in LOE 25448, which included data from a site that is not in this water body. The data from LOE 25448 have been split into two LOEs, with data now evaluated under the correct water body.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Revised Draft of the 2007 Review of the Monitoring Data for the Irrigated Lands Regulatory Conditional Waiver Program

Evaluation Guideline:

Per 22 CCR 64449: The recommended Secondary Maximum Contaminant Level for chloride is 250 mg/L.

Guideline Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Spatial Representation:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

2011 Edition of the Drinking Water Standards and Health Advisories

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA5 was collected at 1 monitoring site [ Russian River at Alexander Valley Bridge - 114RR4234]

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

106130

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater criterion continuous concentration to protect aquatic organisms is 0.014 ug/L (Siepmann and Finlayson 2000).

Guideline Reference:

Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

<" width="33%">Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324062

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chloride.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River div style="background-color:#CCCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos		Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116085

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater criterion continuous concentration to protect aquatic organisms is 0.014 ug/L (Siepmann and Finlayson 2000).

Guideline Reference:

Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324161

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324164

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chlorpyrifos.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water health advisory for chlorpyrifos is 2 ug/L.

Guideline RHA, Geyserville HSA

LOE ID:

324009

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chloride.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328155

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324155

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater criterion continuous concentration to protect aquatic organisms is 0.014 ug/L (Siepmann and Finlayson 2000).

Guideline Reference:

Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

rds.ca.gov/water_issues/programs/tmdl/records/region_1/2018/ref4527.pdf" >Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The chloride criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 230000 ug/L (230 mg/L)(USEPA National Recommended Water Quality Criteria, 2006). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328148 Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed EPA National Aquatic Resources Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chloride. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The chloride criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 230000 ug/L (230 mg/L)(USEPA National Recommended Water Quality Criteria, 2006). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River). Temporal Representation: The samples were collected between the dates of 2013-08-26 and 2013-09-25 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328193 Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chloride. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA). Temporal Representation: The samples were collected between the dates of 2017-05-01 and 2017-05-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328133 Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chloride. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328115 Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chloride. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The chloride criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 230000 ug/L (230 mg/L)(USEPA National Recommended Water Quality Criteria, 2006). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157546, Chloride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328131 Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chloride. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle


DECISION ID	157610	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Chlorpyrifos, methyl
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157610, Chlorpyrifos, methyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

115821

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chlorpyrifos Methyl.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Chlorpyrifos Methyl is the USEPA Aquatic Life Benchmark of 0.085 ug/L for an invertebrate (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157610, Chlorpyrifos, methyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

115822

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Chlorpyrifos Methyl.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Chlorpyrifos Methyl is the USEPA Aquatic Life Benchmark of 0.085 ug/L for an invertebrate (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157610, Chlorpyrifos, methyl

Region 1

Russian River HU, Middle R


DECISION ID	157547	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Chlorophyll-a
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157547, Chlorophyll-a	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324132

Pollutant:

Chlorophyll-a

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chlorophyll a.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157547, Chlorophyll-a	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324123

Pollutant:

Chlorophyll-a

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chlorophyll a.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

ussian River HA, Geyserville HSA

LOE ID:

115820

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chlorpyrifos Methyl.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Chlorpyrifos Methyl is the USEPA Aquatic Life Benchmark of 0.085 ug/L for an invertebrate (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157610, Chlorpyrifos, methyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108323

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Chlorpyrifos Methyl.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:


DECISION ID	157548	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Chlorpyrifos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Thirteen lines of evidence are available in the administrative record to assess this pollutant. One of one sample exceeds the None fraction of water Municipal & Domestic Supply beneficial use objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of one sample exceeds the None fraction of water Municipal & Domestic Supply beneficial use objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. While two samples in line of evidence 124072 did exceed the objective for the MUN beneficial use, these two samples were not spatially or temporally independent of each other and will therefore be counted as a single sample.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:	While two samples in line of evidence 124072 did exceed the objective for the MUN beneficial use, these two samples were not spatially or temporally independent of each other and will therefore be counted as a single sample.

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:	Two samples have exceedances for the MUN beneficial use; however these samples are not temporally or spatially independent and will therefore be treated as a single sample.

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

113944

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Chlorpyrifos Methyl is the USEPA Aquatic Life Benchmark of 0.085 ug/L for an invertebrate (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157610, Chlorpyrifos, methyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124084

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 10 samples exceed the criterion for Chlorpyrifos Methyl, Total. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The USEPA Health Advisory for life time exposure to Chlorpyrifos is 0.002 mg/L (EPA 820-R-11-002 Drinking Water Standards and Health Advisories, 2011).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157610, Chlorpyrifos, methyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

115819

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Chlorpyrifos Methyl.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Chlorpyrifos Methyl is the USEPA Aquatic Life Benchmark of 0.085 ug/L for an invertebrate (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157610, Chlorpyrifos, methyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124083

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 40 samples exceed the criterion for Chlorpyrifos Methyl, Total. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate thmples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater criterion continuous concentration to protect aquatic organisms is 0.014 ug/L (Siepmann and Finlayson 2000).

Guideline Reference:

Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41152

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108329

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Chlorpyrifos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water health advisory for chlorpyrifos is 2 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108330

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chlorpyrifos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water health advisory for chlorpyrifos is 2 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108332

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Chlorpyrifos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water health advisory for chlorpyrifos is 2 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates ofese data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The USEPA Health Advisory for life time exposure to Chlorpyrifos is 0.002 mg/L (EPA 820-R-11-002 Drinking Water Standards and Health Advisories, 2011).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157610, Chlorpyrifos, methyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324176

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chlorpyrifos Methyl.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Chlorpyrifos Methyl is the USEPA Aquatic Life Benchmark of 0.085 ug/L for an invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157610, Chlorpyrifos, methyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324169

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chlorpyrifos Methyl.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Chlorpyrifos Methyl is the USEPA Aquatic Life Benchmark of 0.085 ug/L for an invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157610, Chlorpyrifos, methyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108328

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Chlorpyrifos Methyl.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Chlorpyrifos Methyl is the USEPA Aquatic Life Benchmark of 0.085 ug/L for an invertebrate (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157610, Chlorpyrifos, methyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124082

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 40 samples exceed the criterion for Chlorpyrifos Methyl, Total. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The USEPA Health Advisory for life time exposure to Chlorpyrifos is 0.002 mg/L (EPA 820-R-11-002 Drinking Water Standards and Health Advisories, 2011).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43524

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for chlorpyrifos is the median lethal concentration (LC50) of 1.77 ug/g and is normalized by the percentage of organic carbon in the sediment sample (Amweg and Weston, 2007).

Guideline Reference:

Whole-sediment toxicity identification evaluation tools for pyrethroid insecticides: I. piperonyl butoxide addition. Environ. Toxicol. Chem. 26:2389-2396.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43525

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for chlorpyrifos is the median lethal concentration (LC50) of 1.77 ug/g and is normalized by the percentage of organic carbon in the sediment sample (Amweg and Weston, 2007).

Guideline Reference:

Whole-sediment toxicity identification evaluation tools for pyrethroid insecticides: I. piperonyl butoxide addition. Environ. Toxicol. Chem. 26:2389-2396.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124072

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The USEPA Health Advisory for life time exposure to Chlorpyrifos is 0.002 mg/L (EPA 820-R-11-002 Drinking Water Standards and Health Advisories, 2011).

Objective/Criterion Reference:

DECISION ID

157611

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Chromium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Twenty-six lines of evidence are available in the administrative record to assess this pollutant. One of one sample exceeds the Cold Freshwater Habitat beneficial use objective for the total fraction of sediment, one of one sample exceeds the Warm Freshwater Habitat beneficial use objective for the total fraction of sediment, and six of one hundred twenty-four samples exceed the Municipal & Domestic Supply beneficial use objective for the total fraction of water. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of one sample exceeds the Cold Freshwater Habitat beneficial use objective for the total fraction of sediment, one of one sample exceeds the Warm Freshwater Habitat beneficial use objective for the total fraction of sediment, and six of one hundred twenty-four samples exceed the Municipal & Domestic Supply beneficial use objective for the total fraction of water, and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43756

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceed the criterion for Chromium.

Data Reference:

2011 Edition of the Drinking Water Standards and Health Advisories

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA5 was collected at 1 monitoring site [ Russian River at Alexander Valley Bridge - 114RR4234]

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

106130

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater criterion continuous concentration to protect aquatic organisms is 0.014 ug/L (Siepmann and Finlayson 2000).

Guideline Reference:

Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for chromium is 111 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

34304

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for chromium III or the criteria for chromium VI.

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each chromium III sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. The criterion continuous concentration (4-day average) to protect aquatic life in freshwater for chromium VI is 11 ug/L and is not hardness dependent.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR2940 (Russian River at Healdsburg Memorial Beach).

Temporal Representation:

Samples collected between 11/26/07 and 7/14/08.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface div style="background-color:#CCCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116085

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater criterion continuous concentration to protect aquatic organisms is 0.014 ug/L (Siepmann and Finlayson 2000).

Guideline Reference:

Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324161

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124096

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 23 samples exceed the criterion for Chromium, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/21/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41183

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324164

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chlorpyrifos.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water health advisory for chlorpyrifos is 2 ug/L.

Guideline Rr>

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

46872

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Zero of 27 samples exceeded the chromium objective. This LOE contains data originally evaluated in LOE 21544 from the 2010 Integrated Report, which included data from a site that is not in this water body. The data from LOE 21544 have been re-assessed and the data are now evaluated under the correct water body. Data were also reassessed in order to evaluate nickel and chromium data in their own individual LOEs.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157548, Chlorpyrifos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324155

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater criterion continuous concentration to protect aquatic organisms is 0.014 ug/L (Siepmann and Finlayson 2000).

Guideline Reference:

Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

width="67%"> Guideline Reference: Spatial Representation: Samples were collected from the mainstem Russian River at 2 locations as follows: (1) at Cloverdale (SWAMP Station ID 114RRCLO1) and (2) downstream of the Cloverdale Water Treatment Plant (SWAMP Station ID 114CLOSTP). Samples were collected from well-mixed flows in glides or riffles. Temporal Representation: At the Cloverdale site samples were collected over 22 site visits at each site from June 2001 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 46868 Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 25 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Zero of 25 samples exceeded the chromium objective. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008). This LOE contains data originally evaluated in LOE 21544, which included data from a site that is not in this water body. The data from LOE 21544 have been re-assessed and the data are now evaluated under the correct water body. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Samples were collected from the mainstem Russian River at 2 locations as follows: (1) at Cloverdale (SWAMP Station ID 114RRCLO1) and (2) downstream of the Cloverdale Water Treatment Plant (SWAMP Station ID 114CLOSTP). Samples were collected from well-mixed flows in glides or riffles. Temporal Representation: At the Cloverdale site samples were collected over 22 site visits at each site from June 2001 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124085 Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Chromium, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108333 Pollutant: Chromium LOE Subgroup: Pollutant-Water

DECISION ID

157610

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Chlorpyrifos, methyl
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157610, Chlorpyrifos, methyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

115821

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chlorpyrifos Methyl.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Chlorpyrifos Methyl is the USEPA Aquatic Life Benchmark of 0.085 ug/L for an invertebrate (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157610, Chlorpyrifos, methyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

115822

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Chlorpyrifos Methyl.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Chlorpyrifos Methyl is the USEPA Aquatic Life Benchmark of 0.085 ug/L for an invertebrate (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157610, Chlorpyrifos, methyl

Region 1

Russian River HU, Middle Rvalign="top" width="33%">Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124095

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 2 samples exceed the criterion for Chromium, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Comminski Station - 114RRCOMM]

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324224

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chromium.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved Chromium to protect aquatic life in freshwater. The dissolved Chromium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157611, Chromium

Region 1

LOE ID:

115820

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chlorpyrifos Methyl.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Chlorpyrifos Methyl is the USEPA Aquatic Life Benchmark of 0.085 ug/L for an invertebrate (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157610, Chlorpyrifos, methyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108323

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Chlorpyrifos Methyl.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Chlorpyrifos Methyl is the USEPA Aquatic Life Benchmark of 0.085 ug/L for an invertebrate (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157610, Chlorpyrifos, methyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124084

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 10 samples exceed the criterion for Chlorpyrifos Methyl, Total. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The USEPA Health Advisory for life time exposure to Chlorpyrifos is 0.002 mg/L (EPA 820-R-11-002 Drinking Water Standards and Health Advisories, 2011).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324223

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324212

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contami style="background-color:#CCCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 157610, Chlorpyrifos, methyl

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

115819

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Chlorpyrifos Methyl.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Chlorpyrifos Methyl is the USEPA Aquatic Life Benchmark of 0.085 ug/L for an invertebrate (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157610, Chlorpyrifos, methyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124083

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 40 samples exceed the criterion for Chlorpyrifos Methyl, Total. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate thnant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324253

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324228

Pollutant:

Chromium

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The USEPA Health Advisory for life time exposure to Chlorpyrifos is 0.002 mg/L (EPA 820-R-11-002 Drinking Water Standards and Health Advisories, 2011).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157610, Chlorpyrifos, methyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324176

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chlorpyrifos Methyl.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Chlorpyrifos Methyl is the USEPA Aquatic Life Benchmark of 0.085 ug/L for an invertebrate (acute).

Guideline Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chromium.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43755

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictividth="33%">Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157610, Chlorpyrifos, methyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324169

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chlorpyrifos Methyl.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Chlorpyrifos Methyl is the USEPA Aquatic Life Benchmark of 0.085 ug/L for an invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157610, Chlorpyrifos, methyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108328

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Chlorpyrifos Methyl.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Chlorpyrifos Methyl is the USEPA Aquatic Life Benchmark of 0.085 ug/L for an invertebrate (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157610, Chlorpyrifos, methyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124082

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 40 samples exceed the criterion for Chlorpyrifos Methyl, Total. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The USEPA Health Advisory for life time exposure to Chlorpyrifos is 0.002 mg/L (EPA 820-R-11-002 Drinking Water Standards and Health Advisories, 2011).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

e of sediment toxicity) for chromium is 111 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328239

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328235

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved chromium to protect aquatic life in freshwater. The dissolved Chromium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328238

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

DECISION ID

157611

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Chromium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Twenty-six lines of evidence are available in the administrative record to assess this pollutant. One of one sample exceeds the Cold Freshwater Habitat beneficial use objective for the total fraction of sediment, one of one sample exceeds the Warm Freshwater Habitat beneficial use objective for the total fraction of sediment, and six of one hundred twenty-four samples exceed the Municipal & Domestic Supply beneficial use objective for the total fraction of water. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of one sample exceeds the Cold Freshwater Habitat beneficial use objective for the total fraction of sediment, one of one sample exceeds the Warm Freshwater Habitat beneficial use objective for the total fraction of sediment, and six of one hundred twenty-four samples exceed the Municipal & Domestic Supply beneficial use objective for the total fraction of water, and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Water Quality Control Plan (Basin Plan) for the North Coast Region d align="left" valign="top" width="33%">SWAMP Data:

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43756

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324205

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324198

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for chromium is 111 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

34304

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for chromium III or the criteria for chromium VI.

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each chromium III sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. The criterion continuous concentration (4-day average) to protect aquatic life in freshwater for chromium VI is 11 ug/L and is not hardness dependent.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR2940 (Russian River at Healdsburg Memorial Beach).

Temporal Representation:

Samples collected between 11/26/07 and 7/14/08.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 0 samples exceeded the water quality threshold for Chromium.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324200

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chromium.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124096

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/21/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41183

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324237

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chromium.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324196

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

46872

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 0 samples exceeded the water quality threshold for Chromium.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324203

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108334

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Chromium.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124097

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 6/22/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108333 Pollutant: Chromium LOE Subgroup: Pollutant-Water

DECISION ID

157618

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Cinerin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 108335 has been replaced by LOE 349109 and LOE 108336 has been replaced by LOE 349106 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157618, Cinerin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349106

Pollutant:

Cinerin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cinerin.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for cinerin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chrovalign="top" width="33%">Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124095

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 2 samples exceed the criterion for Chromium, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157618, Cinerin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349109

Pollutant:

Cinerin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cinerin.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for cinerin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of cinerin-1 and cinerin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157618, Cinerin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324272

Pollutant:

Cinerin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cinerin.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for cinerin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of cinerin-1 and cinerin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157618, Cinerin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324273

Pollutant:

Cinerin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cinerin.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for cinerin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of cinerin-1 and cinerin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

n="left" valign="top" width="33%">Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Comminski Station - 114RRCOMM] Temporal Representation: Data was collected over the time period 6/21/2001-6/25/2001. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 324224 Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chromium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved Chromium to protect aquatic life in freshwater. The dissolved Chromium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1


DECISION ID	167489	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Ciodrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167489, Ciodrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124108

Pollutant:

Ciodrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Ciodrin, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

LOE ID: 324223 Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 324212 Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contami444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167489, Ciodrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124109 Pollutant: Ciodrin LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Ciodrin, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167489, Ciodrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124098 Pollutant: Ciodrin LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Ciodrin, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) nant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 324253 Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 324228 Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chromium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved Chromium to protect aquatic life in freshwater. The dissolved Chromium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 43755 Pollutant: Chromium LOE Subgroup: Pollutant-Sediment Matrix: Sediment Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 1 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceed the criterion for Chromium. Data Reference: Statewide Stream Pollution Trends Study 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: In freshwater sediments the probable effect concentration (predictiv


DECISION ID	158481	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Cobalt
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 158481, Cobalt	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328250

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158481, Cobalt	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328249

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158481, Cobalt	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328240

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

e of sediment toxicity) for chromium is 111 mg/Kg dry weight (MacDonald et al. 2000). Guideline Reference: Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ] Temporal Representation: Data was collected on a single day 10/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328239 Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved Chromium to protect aquatic life in freshwater. The dissolved Chromium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328235 Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved chromium to protect aquatic life in freshwater. The dissolved Chromium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328238 Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference:

DECISION ID

157615

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Coumaphos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

p" width="67%">The evaluation guideline for Coumaphos is the USEPA Aquatic Life Benchmark of 0.0337 ug/L for an invertebrate (chronic).

Line of Evidence (LOE) for Decision ID 157615, Coumaphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

115801

Pollutant:

Coumaphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324205

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324198

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157615, Coumaphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

118199

Pollutant:

Coumaphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Coumaphos is the USEPA Aquatic Life Benchmark of 0.0337 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157615, Coumaphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

109185

Pollutant:

Coumaphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Coumaphos is the USEPA Aquatic Life Benchmark of 0.0337 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157615, Coumaphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

118196

Pollutant:

Coumaphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Qu

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 0 samples exceeded the water quality threshold for Chromium.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324200

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chromium.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation ality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Coumaphos is the USEPA Aquatic Life Benchmark of 0.0337 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157615, Coumaphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

118201

Pollutant:

Coumaphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Coumaphos is the USEPA Aquatic Life Benchmark of 0.0337 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324237

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chromium.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324196

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Line of Evidence (LOE) for Decision ID 157615, Coumaphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324398

Pollutant:

Coumaphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Coumaphos is the USEPA Aquatic Life Benchmark of 0.0337 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157615, Coumaphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

102430

Pollutant:

Coumaphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Coumaphos is the USEPA Aquatic Life Benchmark of 0.0337 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157615, Coumaphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324394

Pollutant:

Coumaphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Coumaphos is the USEPA Aquatic Life Benchmark of 0.0337 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

idth="33%">Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 0 samples exceeded the water quality threshold for Chromium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved Chromium to protect aquatic life in freshwater. The dissolved Chromium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road). Temporal Representation: The samples were collected between the dates of 2019-01-16 and 2019-01-16 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 324203 Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road). Temporal Representation: The samples were collected between the dates of 2019-01-16 and 2019-01-16 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108334 Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 6 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Chromium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-09-28 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157611, Chromium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124097 Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 23 Number of Exceedances: 2 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 23 samples exceed the criterion for Chromium, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 6/22/2001-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	157596	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Cyanazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157596, Cyanazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324406

Pollutant:

Cyanazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cyanazine.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water lifetime health advisory for cyanazine is 1 ug/L. The Lifetime HA is based on exposure of a 70-kg adult consuming 2 liters of a water a day.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157596, Cyanazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324404

Pollutant:

Cyanazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cyanazine.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the aquatic life EC50 for Cyanazine is 4.8 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157596, Cyanazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324408

Pollutant:

Cyanazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cyanazine.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the aquatic life EC50 for Cyanazine is 4.8 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157596, Cyanazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108344

Pollutant:

Cyanazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Cyanazine.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water lifetime health advisory for cyanazine is 1 µg/L. The Lifetime HA is based on exposure of a 70-kg adult consuming 2 liters of a water a day.

DECISION ID

157618

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Cinerin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 108335 has been replaced by LOE 349109 and LOE 108336 has been replaced by LOE 349106 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157618, Cinerin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349106

Pollutant:

Cinerin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cinerin.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for cinerin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of cinerin-1 and cinerin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157618, Cinerin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349109

Pollutant:

Cinerin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cinerin.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for cinerin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of cinerin-1 and cinerin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157618, Cinerin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324272

Pollutant:

Cinerin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cinerin.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for cinerin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of cinerin-1 and cinerin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157618, Cinerin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324273

Pollutant:

Cinerin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cinerin.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for cinerin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of cinerin-1 and cinerin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

left" valign="top" width="33%">Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157596, Cyanazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108345 Pollutant: Cyanazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cyanazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA drinking water lifetime health advisory for cyanazine is 1 µg/L. The Lifetime HA is based on exposure of a 70-kg adult consuming 2 liters of a water a day. Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157596, Cyanazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108346 Pollutant: Cyanazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Cyanazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA drinking water lifetime health advisory for cyanazine is 1 µg/L. The Lifetime HA is based on exposure of a 70-kg adult consuming 2 liters of a water a day. Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	167489	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Ciodrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167489, Ciodrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124108

Pollutant:

Ciodrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Ciodrin, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167489, Ciodrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124109

Pollutant:

Ciodrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Ciodrin, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167489, Ciodrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124098

Pollutant:

Ciodrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Ciodrin, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	167491	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Cyfluthrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167491, Cyfluthrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43542

Pollutant:

Cyfluthrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for cyfluthrin is the median lethal concentration (LC50) of 1.1 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1.1 ug/g is the geometric mean of LC50 values for cyfluthrin from Amweg et al. (2005).

Guideline Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167491, Cyfluthrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349183

Pollutant:

Cyfluthrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The chronic criterion for cyfluthrin is 0.2 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of cyfluthrin were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.

Guideline Reference:

Water Quality Criteria Report for Cyfluthrin

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 167491, Cyfluthrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349194

Pollutant:

Cyfluthrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Cyfluthrin

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167491, Cyfluthrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43543

Pollutant:

Cyfluthrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan


DECISION ID	158481	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Cobalt
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 158481, Cobalt	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328250

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158481, Cobalt	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328249

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158481, Cobalt	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328240

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle


DECISION ID	167492	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Cyhalothrin, Lambda
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167492, Cyhalothrin, Lambda	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349945

Pollutant:

Cyhalothrin, Lambda

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The chronic criterion for lambda-cyhalothrin is 0.3 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of lambda-cyhalothrin were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.

Guideline Reference:

Water Quality Criteria Report for Lambda-cyhalothrin

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 167492, Cyhalothrin, Lambda	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349934

Pollutant:

Cyhalothrin, Lambda

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Lambda-cyhalothrin

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167492, Cyhalothrin, Lambda	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43590

Pollutant:

Cyhalothrin, Lambda

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for lambda-cyhalothrin is the median lethal concentration (LC50) of 0.44 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.44 ug/g is the geometric mean of LC50 values for lambda-cyhalothrin from Amweg et al. (2005).

Guideline Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167492, Cyhalothrin, Lambda	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43601

Pollutant:

Cyhalothrin, Lambda

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan


DECISION ID	157615	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Coumaphos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157615, Coumaphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

115801

Pollutant:

Coumaphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Coumaphos is the USEPA Aquatic Life Benchmark of 0.0337 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157615, Coumaphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

118199

Pollutant:

Coumaphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Coumaphos is the USEPA Aquatic Life Benchmark of 0.0337 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157615, Coumaphos	Region 1


DECISION ID	161499	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Cylindrospermopsin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 161499, Cylindrospermopsin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324423

Pollutant:

Cylindrospermopsin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 9 samples exceeded the water quality threshold for Cylindrospermopsin.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

USEPA 10-day cylindrospermopsin health advisory for bottle-fed infants and young children of pre-school age is 0.7 ug/L.

Guideline Reference:

Drinking Water Health Advisory for the Cyanobacterial Microcystin Toxins

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2017-06-15 and 2017-10-17

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161499, Cylindrospermopsin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324424

Pollutant:

Cylindrospermopsin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 9 samples exceeded the water quality threshold for Cylindrospermopsin.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 4 ug/L of cylindrospermopsin as the water concentration protective of swimmers and other contact recreational users including water-skiing/jet-skiing, fishing, boating, sail boarding, and canoeing.

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2017-06-15 and 2017-10-17

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

dth="67%">Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 109185 Pollutant: Coumaphos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Coumaphos. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Coumaphos is the USEPA Aquatic Life Benchmark of 0.0337 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114RR5652). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157615, Coumaphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 118196 Pollutant: Coumaphos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Coumaphos. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Coumaphos is the USEPA Aquatic Life Benchmark of 0.0337 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114BS0310). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157615, Coumaphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 118201 Pollutant: Coumaphos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Coumaphos. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Coumaphos is the USEPA Aquatic Life Benchmark of 0.0337 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114RR5652). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s):

DECISION ID

167493

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Cypermethrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167493, Cypermethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349255

Pollutant:

Cypermethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Line of Evidence (LOE) for Decision ID 157615, Coumaphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324398

Pollutant:

Coumaphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Coumaphos is the USEPA Aquatic Life Benchmark of 0.0337 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157615, Coumaphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

102430

Pollutant:

Coumaphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Coumaphos is the USEPA Aquatic Life Benchmark of 0.0337 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157615, Coumaphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324394

Pollutant:

Coumaphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Coumaphos is the USEPA Aquatic Life Benchmark of 0.0337 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

The chronic criterion for cypermethrin is 0.3 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of cypermethrin were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used. Guideline Reference: Water Quality Criteria Report for Cypermethrin Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 167493, Cypermethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 349280 Pollutant: Cypermethrin LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cypermethrin. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The chronic criterion for cypermethrin is 0.3 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of cypermethrin were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used. Guideline Reference: Water Quality Criteria Report for Cypermethrin Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 167493, Cypermethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 43564 Pollutant: Cypermethrin LOE Subgroup: Pollutant-Sediment Matrix: Sediment Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Cypermethrin, total. Data Reference: Statewide Stream Pollution Trends Study 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for cypermethrin is the median lethal concentration (LC50) of 0.3 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.3 ug/g is the geometric mean of LC50 values for cypermethrin from Maund et al. (2002). Guideline Reference: Partitioning, bioavailability, and toxicity of the pyrethroid insecticide cypermethrin in sediments. Environmental Toxicology and Chemistry 21:9-15 Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV] Temporal Representation: Data was collected on a single day 10/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167493, Cypermethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 43563 Pollutant: Cypermethrin LOE Subgroup: Pollutant-Sediment Matrix: Sediment Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Cypermethrin, total. Data Reference: Statewide Stream Pollution Trends Study 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for cypermethrin is the median lethal concentration (LC50) of 0.3 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.3 ug/g is the geometric mean of LC50 values for cypermethrin from Maund et al. (2002). Guideline Reference: Partitioning, bioavailability, and toxicity of the pyrethroid insecticide cypermethrin in sediments. Environmental Toxicology and Chemistry 21:9-15 Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV] Temporal Representation: Data was collected on a single day 10/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan


DECISION ID	78510	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	DDD (Dichlorodiphenyldichloroethane)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	"This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Nine lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the one samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met."

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 78510, DDD (Dichlorodiphenyldichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33536

Pollutant:

DDD (Dichlorodiphenyldichloroethane)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Zero of 1 sample collected for sum DDD (DDD(o,p') + DDD(p,p')) exceeded the evaluation guideline.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for sum of DDD is 28.0 ug/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected at the following station 114RRAXRV (Russian River at Alexander RV Park).

Temporal Representation:

The samples were collected on 10/14/2008.

Environmental Conditions:

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 78510, DDD (Dichlorodiphenyldichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123955

Pollutant:

DDD (Dichlorodiphenyldichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDD(o,p'), Total. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 78510, DDD (Dichlorodiphenyldichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101878

Pollutant:

DDD (Dichlorodiphenyldichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDD criterion for the protection of human health from the consumption of water and organisms is 0.00083 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 78510, DDD (Dichlorodiphenyldichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

34608

Pollutant:

DDD (Dichlorodiphenyldichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply


DECISION ID	157596	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Cyanazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157596, Cyanazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324406

Pollutant:

Cyanazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cyanazine.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water lifetime health advisory for cyanazine is 1 ug/L. The Lifetime HA is based on exposure of a 70-kg adult consuming 2 liters of a water a day.

Guideli

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

The method detection limit for all 3 of the non-detect samples was greater than the criteria: thus the data was not used in this assessment.

Data Reference:

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The 4,4'-DDD criterion for the protection of human health from the consumption of water and organisms is 0.00031 ug/L (USEPA Nationally Recommended Criteria, 2006).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples were collected on 11/26/2007, 4/7/2008, and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 78510, DDD (Dichlorodiphenyldichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123956

Pollutant:

DDD (Dichlorodiphenyldichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDD(o,p'), Total. Ten samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157596, Cyanazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324404

Pollutant:

Cyanazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cyanazine.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the aquatic life EC50 for Cyanazine is 4.8 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157596, Cyanazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324408

Pollutant:

Cyanazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cyanazine.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the aquatic life EC50 for Cyanazine is 4.8 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157596, Cyanazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108344

Pollutant:

Cyanazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Cyanazine.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water lifetime health advisory for cyanazine is 1 µg/L. The Lifetime HA is based on exposure of a 70-kg adult consuming 2 liters of a water a day.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 78510, DDD (Dichlorodiphenyldichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101877

Pollutant:

DDD (Dichlorodiphenyldichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDD criterion for the protection of human health from consumption of organisms only is 0.00084 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 78510, DDD (Dichlorodiphenyldichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

113988

Pollutant:

DDD (Dichlorodiphenyldichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDD criterion for the protection of human health from consumption of organisms only is 0.00084 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 78510, DDD (Dichlorodiphenyldichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123945

Pollutant:

DDD (Dichlorodiphenyldichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDD(o,p'), Total. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 78510, DDD (Dichlorodiphenyldichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

115876

Pollutant:

DDD (Dichlorodiphenyldichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDD criterion for the protection of human health from the consumption of water and organisms is 0.00083 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157596, Cyanazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157596, Cyanazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA


DECISION ID	78559	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	DDE (Dichlorodiphenyldichloroethylene)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	"This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Nine lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the one samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met."

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 78559, DDE (Dichlorodiphenyldichloroethylene)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

34609

Pollutant:

DDE (Dichlorodiphenyldichloroethylene)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

The method detection limit for all 3 of the non-detect samples was greater than the criteria: thus the data was not used in this assessment.

Data Reference:

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The 4,4'-DDE criterion for the protection of human health from the consumption of water and organisms is 0.00022 ug/L (USEPA Nationally Recommended Criteria, 2006).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples were collected on 11/26/2007, 4/7/2008, and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 78559, DDE (Dichlorodiphenyldichloroethylene)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

102407

Pollutant:

DDE (Dichlorodiphenyldichloroethylene)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDE criterion for the protection of human health from consumption of organisms only is 0.00059 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 78559, DDE (Dichlorodiphenyldichloroethylene)

DECISION ID	167491	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Cyfluthrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167491, Cyfluthrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43542

Pollutant:

Cyfluthrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

102411

Pollutant:

DDE (Dichlorodiphenyldichloroethylene)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDE criterion for the protection of human health from consumption of organisms only is 0.00059 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 78559, DDE (Dichlorodiphenyldichloroethylene)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

107559

Pollutant:

DDE (Dichlorodiphenyldichloroethylene)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167491, Cyfluthrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349183

Pollutant:

Cyfluthrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Cyfluthrin

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 167491, Cyfluthrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349194

Pollutant:

Cyfluthrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Cyfluthrin

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167491, Cyfluthrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43543

Pollutant:

Cyfluthrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

"left" valign="top" width="33%">Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The 4,4'-DDE criterion for the protection of human health from the consumption of water and organisms is 0.00059 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114BS0310). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 78559, DDE (Dichlorodiphenyldichloroethylene)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 106327 Pollutant: DDE (Dichlorodiphenyldichloroethylene) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDE(p,p'). Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The 4,4'-DDE criterion for the protection of human health from the consumption of water and organisms is 0.00059 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114RR5652). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 78559, DDE (Dichlorodiphenyldichloroethylene)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 33568 Pollutant: DDE (Dichlorodiphenyldichloroethylene) LOE Subgroup: Pollutant-Sediment Matrix: Sediment Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Zero of 1 sample collected for sum DDE (DDE(o,p') + DDE(p,p')) exceeded the evaluation guideline. Data Reference: Statewide Stream Pollution Trends Study 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Waters shall not contain substances in concentrations that result in deposition of material that causes nuisance or adversely affect beneficial uses. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for sum of DDE is 31.3 ug/Kg dry weight (MacDonald et al. 2000). Guideline Reference: Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 Spatial Representation: Data were collected at the following station 114RRAXRV (Russian River at Alexander RV Park). Temporal Representation: The samples were collected on 10/14/2008. Environmental Conditions: QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 78559, DDE (Dichlorodiphenyldichloroethylene)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 123969 Pollutant: DDE (Dichlorodiphenyldichloroethylene) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDE(o,p'), Total. Ten samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 78559, DDE (Dichlorodiphenyldichloroethylene)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 123968 Pollutant: DDE (Dichlorodiphenyldichloroethylene) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDE(o,p'), Total. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 78559, DDE (Dichlorodiphenyldichloroethylene)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 123957 Pollutant: DDE (Dichlorodiphenyldichloroethylene) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDE(o,p'), Total. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	167492	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Cyhalothrin, Lambda
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167492, Cyhalothrin, Lambda	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349945

Pollutant:

Cyhalothrin, Lambda

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Lambda-cyhalothrin

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 167492, Cyhalothrin, Lambda	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349934

Pollutant:

Cyhalothrin, Lambda

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Lambda-cyhalothrin

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167492, Cyhalothrin, Lambda	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43590

Pollutant:

Cyhalothrin, Lambda

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167492, Cyhalothrin, Lambda	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43601

Pollutant:

Cyhalothrin, Lambda

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan


DECISION ID	161315	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	DDT (Dichlorodiphenyltrichloroethane)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

113780

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDT criterion for the protection of human health from the consumption of water and organisms is 0.00059 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105776

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDT criterion for the protection of human health from consumption of organisms only is 0.00059 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

DECISION ID

161499

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Cylindrospermopsin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 161499, Cylindrospermopsin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324423

Pollutant:

Cylindrospermopsin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 9 samples exceeded the water quality threshold for Cylindrospermopsin.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

USEPA 10-day cylindrospermopsin health advisory for bottle-fed infants and young children of pre-school age is 0.7 ug/L.

Guideline Reference:

Drinking Water Health Advisory for the Cyanobacterial Microcystin Toxins

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2017-06-15 and 2017-10-17

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161499, Cylindrospermopsin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324424

Pollutant:

Cylindrospermopsin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 9 samples exceeded the water quality threshold for Cylindrospermopsin.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2017-06-15 and 2017-10-17

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

North Coast Region (Region 1)

> LOE ID: 322758 Pollutant: Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD) LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet Beneficial Use: Warm Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of 3 samples exceeded the water quality threshold for Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD). Monitors collected 3 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish, 1 composite of Sacramento Sucker composed of 10 fish, and 1 composite of Smallmouth Bass composed of 6 fish. Because no composites were collected within the same averaging period, these composites represent 3 independent samples. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: National Academy of Science guidelines (NAS 1972) establish a maximum total DDT concentration of 1000 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances. Guideline Reference: National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency Spatial Representation: Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP). Temporal Representation: Data for this line of evidence were collected between 2015-08-03 and 2015-08-03. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes. Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 322767 Pollutant: Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD) LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet Beneficial Use: Cold Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of 3 samples exceeded the water quality threshold for Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD). Monitors collected 3 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish, 1 composite of Sacramento Sucker composed of 10 fish, and 1 composite of Smallmouth Bass composed of 6 fish. Because no composites were collected within the same averaging period, these composites represent 3 independent samples. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: National Academy of Science guidelines (NAS 1972) establish a maximum total DDT concentration of 1000 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances. Guideline Reference: National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency Spatial Representation: Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP). Temporal Representation: Data for this line of evidence were collected between 2015-08-03 and 2015-08-03. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes. Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 25639 Pollutant: DDT (Dichlorodiphenyltrichloroethane) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Not Recorded Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 1 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: One DDT sample collected in the Geyserville HSA had a detectable level of DDT and the sample exceeds the evaluation guideline. The sample concentration was reported as detected not quantifiable (DNQ), with estimated value of .004 ug/l (method detection limit of 0.0025 ug/l, reporting limit of .005 ug/l). There were also an additional 42 samples from the Geyserville HSA , which were non-detect. However, these non-detect data could not be utilized in this assessment because the detection limit for DDT is above the evaluation guideline. Per the listing policy, when a sample value is less than the quantitation limit, and the quantitation limit is greater than the evaluation guideline, the result shall not be used in the analysis. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP) (NCRWQCB 2008). Data Reference: Surface Water Ambient Monitoring Program (SWAMP). DDT, DDE, and DDD data from SWAMP Sampling for Years 2001-2006. North Coast Regional Water Quality Control Board. SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) -


DECISION ID	167493	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Cypermethrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167493, Cypermethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

Per the National Recommended Water Quality Criteria (USEPA 2006): The recommended criterion for DDT for the protection of source waters for human health consumption of water and organisms is 0.00022 ug/l.

Samples were collected from the mainstem Russian River at 3 locations as follows: (1) at Cloverdale (SWAMP Station ID 114RRCLO1), (2) downstream of the Cloverdale Water Treatment Plant (SWAMP Station ID 114CLOSTP), and (3) at Healdsburg Memorial Beach (SWAMP Station ID 114RRHMB1). Samples were collected from well-mixed flows in glides or runs.

At the Cloverdale and Healdsburg Memorial Beach sites, samples were collected over 19 site visits at each site from February 2002 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

33590

Zero of 1 sample collected for sum DDT (DDT(o,p') + DDT (p,p')) exceeded the evaluation guideline.

Water Quality Control Plan (Basin Plan) for the North Coast Region

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for sum of DDT is 62.9 ug/Kg dry weight (MacDonald et al. 2000).

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Data were collected at the following station 114RRAXRV (Russian River at Alexander RV Park).

The samples were collected on 10/14/2008.

Water Quality Criteria Report for Cypermethrin

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Line of Evidence (LOE) for Decision ID 167493, Cypermethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

Water Quality Criteria Report for Cypermethrin

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Line of Evidence (LOE) for Decision ID 167493, Cypermethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Water Quality Control Plan (Basin Plan) for the North Coast Region

The evaluation guideline for cypermethrin is the median lethal concentration (LC50) of 0.3 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.3 ug/g is the geometric mean of LC50 values for cypermethrin from Maund et al. (2002).

Partitioning, bioavailability, and toxicity of the pyrethroid insecticide cypermethrin in sediments. Environmental Toxicology and Chemistry 21:9-15

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Data was collected on a single day 10/14/2008.

Staff is not aware of any special conditions that might affect interpretation of the data.

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167493, Cypermethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Water Quality Control Plan (Basin Plan) for the North Coast Region

Partitioning, bioavailability, and toxicity of the pyrethroid insecticide cypermethrin in sediments. Environmental Toxicology and Chemistry 21:9-15

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Data was collected on a single day 10/14/2008.

Staff is not aware of any special conditions that might affect interpretation of the data.

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

r_issues/programs/tmdl/records/state_board/2010/ref3823.pdf" >Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 33539 Pollutant: DDT (Dichlorodiphenyltrichloroethane) LOE Subgroup: Pollutant-Sediment Matrix: Sediment Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Zero of 1 sample collected for Total DDTs (sum DDD + sum DDE + sum DDT) exceeded the evaluation guideline. Data Reference: Statewide Stream Pollution Trends Study 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Waters shall not contain substances in concentrations that result in deposition of material that causes nuisance or adversely affect beneficial uses. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for total DDTs is 572 ug/Kg dry weight (MacDonald et al. 2000). Guideline Reference: Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 Spatial Representation: Data were collected at the following station 114RRAXRV (Russian River at Alexander RV Park). Temporal Representation: The samples were collected on 10/14/2008. Environmental Conditions: QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 34606 Pollutant: DDT (Dichlorodiphenyltrichloroethane) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: None of the 3 samples exceeded the criterion continuous concentration for 4,4' DDT. The water body was assessed for the sum of DDT(o,p') and DDT(p,p'). Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The 4,4' DDT criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.001 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Samples collected at station 114RR5652 (Russian River at Crocker Road). Temporal Representation: Samples collected between 11/26/2007, 4/7/2008, and 7/14/2008. Environmental Conditions: QAPP Information: SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 107533 Pollutant: DDT (Dichlorodiphenyltrichloroethane) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDT(p,p'). Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The 4,4'-DDT criterion for the protection of human health from consumption of organisms only is 0.00059 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114BS0310). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

DECISION ID

78510

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	DDD (Dichlorodiphenyldichloroethane)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	"This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Nine lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the one samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met."

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

width="67%">Revised Draft of the 2007 Review of the Monitoring Data for the Irrigated Lands Regulatory Conditional Waiver Program

Line of Evidence (LOE) for Decision ID 78510, DDD (Dichlorodiphenyldichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33536

Pollutant:

DDD (Dichlorodiphenyldichloroethane)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Zero of 1 sample collected for sum DDD (DDD(o,p') + DDD(p,p')) exceeded the evaluation guideline.

Data Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116269

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for DDT (Dichlorodiphenyltrichloroethane).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Total DDT criterion for the protection of human health from consumption of organisms only is 0.00059 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108822

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDT criterion for the protection of human health from the consumption of water and organisms is 0.00059 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

46527

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

One DDT sample collected in the Geyserville HSA at site RRCLO1 had a detectable level of DDT and the sample exceeds the evaluation guideline. The sample concentration was reported as detected not quantifiable (DNQ), with estimated value of .004 ug/l (method detection limit of 0.0025 ug/l, reporting limit of .005 ug/l). The other samples from the Geyserville HSA were all non-detect. These non-detect data could not be utilized in this assessment because the detection limit for DDT is above the evaluation guideline. Per the listing policy, when a sample value is less than the quantitation limit, and the quantitation limit is greater than the evaluation guideline, the result shall not be used in the analysis. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP) (NCRWQCB 2008). This LOE and LOE 46526 contain data originally evaluated in LOE 25639, which included data from a site that is not in this water body. The data from LOE 25639 have been split into two LOEs, with data now evaluated under the correct water body.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). DDT, DDE, and DDD data from SWAMP Sampling for Years 2001-2006. North Coast Regional Water Quality Control Board.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for sum of DDD is 28.0 ug/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected at the following station 114RRAXRV (Russian River at Alexander RV Park).

Temporal Representation:

The samples were collected on 10/14/2008.

Environmental Conditions:

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 78510, DDD (Dichlorodiphenyldichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123955

Pollutant:

DDD (Dichlorodiphenyldichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDD(o,p'), Total. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 78510, DDD (Dichlorodiphenyldichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101878

Pollutant:

DDD (Dichlorodiphenyldichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDD criterion for the protection of human health from the consumption of water and organisms is 0.00083 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 78510, DDD (Dichlorodiphenyldichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

34608

Pollutant:

DDD (Dichlorodiphenyldichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the mainstem Russian River at 2 locations as follows: (1) at Cloverdale (SWAMP Station ID 114RRCLO1) and (2) downstream of the Cloverdale Water Treatment Plant (SWAMP Station ID 114CLOSTP). Samples were collected from well-mixed flows in glides or runs.

Temporal Representation:

At the Cloverdale site, samples were collected over 19 site visits from February 2002 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322774

Pollutant:

Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of 3 samples exceeded the water quality threshold for Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD). Monitors collected 3 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish, 1 composite of Sacramento Sucker composed of 10 fish, and 1 composite of Smallmouth Bass composed of 6 fish. Because no composites were collected within the same averaging period, these composites represent 3 independent samples.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The modified OEHHA Fish Contaminant Goal for total DDT in fish tissue is 15 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008)

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

113782

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDT criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.001 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108818

Pollutant:

DDT (Dichlorodiphenyltrich

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

The method detection limit for all 3 of the non-detect samples was greater than the criteria: thus the data was not used in this assessment.

Data Reference:

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples were collected on 11/26/2007, 4/7/2008, and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 78510, DDD (Dichlorodiphenyldichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123956

Pollutant:

DDD (Dichlorodiphenyldichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDD(o,p'), Total. Ten samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDT criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.001 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116268

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for DDT (Dichlorodiphenyltrichloroethane).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Total DDT criterion for the protection of human health from consumption of organisms only is 0.00059 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

34607

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

The method detection limit for all 3 of the non-detect samples was greater than the criteria: thus the data was not used in this assessment.

Data Reference:

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The 4,4' DDT criterion for the protection of human health from the consumption of water and organisms is 0.00022 ug/L (USEPA Nationally Recommended Criteria, 2006).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station Samples collected at station 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples were collected on 11/26/2007, 4/7/2008, and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

> Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 78510, DDD (Dichlorodiphenyldichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 101877 Pollutant: DDD (Dichlorodiphenyldichloroethane) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDD(p,p'). Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The 4,4'-DDD criterion for the protection of human health from consumption of organisms only is 0.00084 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114RR5652). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 78510, DDD (Dichlorodiphenyldichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 113988 Pollutant: DDD (Dichlorodiphenyldichloroethane) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDD(p,p'). Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The 4,4'-DDD criterion for the protection of human health from consumption of organisms only is 0.00084 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114BS0310). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 78510, DDD (Dichlorodiphenyldichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 123945 Pollutant: DDD (Dichlorodiphenyldichloroethane) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDD(o,p'), Total. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 78510, DDD (Dichlorodiphenyldichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 115876 Pollutant: DDD (Dichlorodiphenyldichloroethane) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDD(p,p'). Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The 4,4'-DDD criterion for the protection of human health from the consumption of water and organisms is 0.00083 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114BS0310). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	167494	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Dacthal
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 41275 has been replaced by LOE 349336 and LOE 41227 has been replaced by LOE 349330 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167494, Dacthal	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349330

Pollutant:

Dacthal

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Dacthal is the USEPA Aquatic Life Benchmark of >11000 ug/L for a nonvascular plant (acute) and vascular plant (acute). The benchmark was derived from a greater-than value (for example, > 265,000) and may overestimate toxicity.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167494, Dacthal	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349336

Pollutant:

Dacthal

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167494, Dacthal	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116265

Pollutant:

Dacthal

LOE Subgroup:

Pollutant-Water

DECISION ID

78559

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	DDE (Dichlorodiphenyldichloroethylene)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	"This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Nine lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the one samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met."

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 78559, DDE (Dichlorodiphenyldichloroethylene)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

34609

Pollutant:

DDE (Dichlorodiphenyldichloroethylene)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

The method detection limit for all 3 of the non-detect samples was greater than the criteria: thus the data was not used in this assessment.

Data Reference:

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The 4,4'-DDE criterion for the protection of human health from the consumption of water and organisms is 0.00022 ug/L (USEPA Nationally Recommended Criteria, 2006).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples were collected on 11/26/2007, 4/7/2008, and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 78559, DDE (Dichlorodiphenyldichloroethylene)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

102407

Pollutant:

DDE (Dichlorodiphenyldichloroethylene)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDE criterion for the protection of human health from consumption of organisms only is 0.00059 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 78559, DDE (Dichlorodiphenyldichloroethylene)

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dacthal.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Lifetime Health advisory level for Dacthal is 0.07 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167494, Dacthal	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116266

Pollutant:

Dacthal

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dacthal.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Dacthal is the USEPA Aquatic Life Benchmark of > 11000 ug/L for a nonvascular plant (acute) and vascular plant (acute). The benchmark was derivedt-align: right; PADDING-TOP: 3px; font-smooth: always">Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

102411

Pollutant:

DDE (Dichlorodiphenyldichloroethylene)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDE criterion for the protection of human health from consumption of organisms only is 0.00059 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 78559, DDE (Dichlorodiphenyldichloroethylene)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

107559

Pollutant:

DDE (Dichlorodiphenyldichloroethylene)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

265,000) and may overestimate toxicity."

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167494, Dacthal	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108347

Pollutant:

Dacthal

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dacthal.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Dacthal is the USEPA Aquatic Life Benchmark of > 11000 ug/L for a nonvascular plant (acute) and vascular plant (acute). The benchmark was derived from a \greater-than\" value (for example, > 265,000) and may overestimate toxicity."

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167494, Dacthal	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123944

Pollutant:

Dacthal

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dacthal, Total. Five sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. USEPA's Lifetime Health advisory level for Dacthal is 0.07 mg/L as stated on page 3 of the 2011 edition of the drinking water standards and health advisories.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

2011 Edition of the Drinking Water Standards and Health Advisories

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167494, Dacthal	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116264

Pollutant:

Dacthal

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dacthal.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDE criterion for the protection of human health from the consumption of water and organisms is 0.00059 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 78559, DDE (Dichlorodiphenyldichloroethylene)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

106327

Pollutant:

DDE (Dichlorodiphenyldichloroethylene)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDE criterion for the protection of human health from the consumption of water and organisms is 0.00059 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 78559, DDE (Dichlorodiphenyldichloroethylene)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33568

Pollutant:

DDE (Dichlorodiphenyldichloroethylene)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Zero of 1 sample collected for sum DDE (DDE(o,p') + DDE(p,p')) exceeded the evaluation guideline.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for sum of DDE is 31.3 ug/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected at the following station 114RRAXRV (Russian River at Alexander RV Park).

Temporal Representation:

The samples were collected on 10/14/2008.

Environmental Conditions:

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 78559, DDE (Dichlorodiphenyldichloroethylene)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123969

Pollutant:

DDE (Dichlorodiphenyldichloroethylene)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Dacthal is the USEPA Aquatic Life Benchmark of > 11000 ug/L for a nonvascular plant (acute) and vascular plant (acute). The benchmark was derived from a \greater-than\" value (for example, > 265,000) and may overestimate toxicity."

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167494, Dacthal	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123943

Pollutant:

Dacthal

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dacthal, Total. Twenty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. USEPA's Lifetime Health advisory level for Dacthal is 0.07 mg/L as stated on page 3 of the 2011 edition of the drinking water standards and health advisories.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

2011 Edition of the Drinking Water Standards and Health Advisories

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this lin="67%">State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDE(o,p'), Total. Ten samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 78559, DDE (Dichlorodiphenyldichloroethylene)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123968

Pollutant:

DDE (Dichlorodiphenyldichloroethylene)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDE(o,p'), Total. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 78559, DDE (Dichlorodiphenyldichloroethylene)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123957

Pollutant:

DDE (Dichlorodiphenyldichloroethylene)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDE(o,p'), Total. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

e of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167494, Dacthal	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124135 Pollutant: Dacthal LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dacthal, Total. Twenty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. USEPA's Lifetime Health advisory level for Dacthal is 0.07 mg/L as stated on page 3 of the 2011 edition of the drinking water standards and health advisories. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: 2011 Edition of the Drinking Water Standards and Health Advisories Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167494, Dacthal	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108349 Pollutant: Dacthal LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dacthal. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Dacthal is the USEPA Aquatic Life Benchmark of > 11000 ug/L for a nonvascular plant (acute) and vascular plant (acute). The benchmark was derived from a \greater-than\" value (for example, > 265,000) and may overestimate toxicity." Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167494, Dacthal	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108348 Pollutant: Dacthal LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dacthal. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA Lifetime Health advisory level for Dacthal is 0.07 mg/L. Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	167495	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Deltamethrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167495, Deltamethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349379

Pollutant:

Deltamethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for delta


DECISION ID	161315	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	DDT (Dichlorodiphenyltrichloroethane)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

113780

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDT criterion for the protection of human health from the consumption of water and organisms is 0.00059 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105776

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDT criterion for the protection of human health from consumption of organisms only is 0.00059 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167495, Deltamethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43621

Pollutant:

Deltamethrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for deltamethrin is the median lethal concentration (LC50) of 0.79 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.79 ug/g is the geometric mean of LC50 values for deltamethrin from Amweg et al. (2005).

Guideline Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167495, Deltamethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43622

Pollutant:

Deltamethrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167495, Deltamethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349365

Pollutant:

Deltamethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for deltamethrin is the USEPA Aquatic Life Benchmark of 0.000026 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

LOE ID:

322758

Pollutant:

Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science guidelines (NAS 1972) establish a maximum total DDT concentration of 1000 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322767

Pollutant:

Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). DDT, DDE, and DDD data from SWAMP Sampling for Years 2001-2006. North Coast Regional Water Quality Control Board.

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

25639

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

One DDT sample collected in the Geyserville HSA had a detectable level of DDT and the sample exceeds the evaluation guideline. The sample concentration was reported as detected not quantifiable (DNQ), with estimated value of .004 ug/l (method detection limit of 0.0025 ug/l, reporting limit of .005 ug/l). There were also an additional 42 samples from the Geyserville HSA , which were non-detect. However, these non-detect data could not be utilized in this assessment because the detection limit for DDT is above the evaluation guideline. Per the listing policy, when a sample value is less than the quantitation limit, and the quantitation limit is greater than the evaluation guideline, the result shall not be used in the analysis. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP) (NCRWQCB 2008).

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) -


DECISION ID	157612	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Demeton
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Demeton, Total.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site(s) (114BS0310)

The samples were collected between the dates of 2010-11-30 and 2011-05-31

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Demeton, Total.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site(s) (114RR5652)

The samples were collected between the dates of 2010-11-30 and 2011-05-31

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

123970

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

33590

Zero of 1 sample collected for sum DDT (DDT(o,p') + DDT (p,p')) exceeded the evaluation guideline.

Water Quality Control Plan (Basin Plan) for the North Coast Region

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for sum of DDT is 62.9 ug/Kg dry weight (MacDonald et al. 2000).

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Data were collected at the following station 114RRAXRV (Russian River at Alexander RV Park).

The samples were collected on 10/14/2008.

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Demeton-s, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Water Quality Control Plan (Basin Plan) for the North Coast Region

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Data was collected over the time period 2/6/2002-11/13/2006.

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Demeton-s, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessedr_issues/programs/tmdl/records/state_board/2010/ref3823.pdf" >Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

33539

Zero of 1 sample collected for Total DDTs (sum DDD + sum DDE + sum DDT) exceeded the evaluation guideline.

Water Quality Control Plan (Basin Plan) for the North Coast Region

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for total DDTs is 572 ug/Kg dry weight (MacDonald et al. 2000).

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Data were collected at the following station 114RRAXRV (Russian River at Alexander RV Park).

The samples were collected on 10/14/2008.

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

34606

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Water Quality Control Plan (Basin Plan) for the North Coast Region

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Data was collected over the time period 10/5/2004-6/30/2005.

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Demeton-s, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

None of the 3 samples exceeded the criterion continuous concentration for 4,4' DDT. The water body was assessed for the sum of DDT(o,p') and DDT(p,p').

Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The 4,4' DDT criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.001 ug/L (California Toxics Rule, 2000).

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Samples collected at station 114RR5652 (Russian River at Crocker Road).

Samples collected between 11/26/2007, 4/7/2008, and 7/14/2008.

SWAMP QAPP (2008) was followed.

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

107533

Commercial or recreational collection of fish, shellfish, or organisms

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

The 4,4'-DDT criterion for the protection of human health from consumption of organisms only is 0.00059 ug/L (California Toxics Rule, 2000).

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Water Quality Control Plan (Basin Plan) for the North Coast Region

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Data was collected over the time period 2/6/2002-11/13/2006.

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Demeton, Total.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

The USEPA expected safe lifetime exposure limit in drinking water for Demeton, calculated using the IRIS Reference Dose, is 0.3 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.00004 mg/kg/day as the reference dose.

The samples were collected at 1 monitoring site(s) (114RR5652)

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157612, Demeton

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

116269

Commercial or recreational collection of fish, shellfish, or organisms

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for DDT (Dichlorodiphenyltrichloroethane).

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

The Total DDT criterion for the protection of human health from consumption of organisms only is 0.00059 ug/L (California Toxics Rule, 2000).

The samples were collected at 1 monitoring site(s) (114RR5652)

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

108822

Data Used to Assess Water Quality:Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Demeton, Total.

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

The samples were collected between the dates of 2014-02-03 and 2014-02-03

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Demeton, Total.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

The 4,4'-DDT criterion for the protection of human health from the consumption of water and organisms is 0.00059 ug/L (California Toxics Rule, 2000).

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

46527

Surface Water Ambient Monitoring Program (SWAMP). DDT, DDE, and DDD data from SWAMP Sampling for Years 2001-2006. North Coast Regional Water Quality Control Board.

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Demeton, Total.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site(s) (114BS0310)

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Qua width="67%">Revised Draft of the 2007 Review of the Monitoring Data for the Irrigated Lands Regulatory Conditional Waiver Program

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

322774

Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)

Commercial or recreational collection of fish, shellfish, or organisms

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Water Quality Control Plan (Basin Plan) for the North Coast Region

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Demeton, Total.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site(s) (114RR5652)

The samples were collected between the dates of 2010-11-30 and 2011-05-31

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russianlign="left" valign="top" width="33%">Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

113782

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

The 4,4'-DDT criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.001 ug/L (California Toxics Rule, 2000).

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

108818

DDT (Dichlorodiphenyltrich River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Demeton, Total.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site(s) (114BS0310)

The samples were collected between the dates of 2010-11-30 and 2011-05-31

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Demeton, Total.

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

The samples were collected between the dates of 2014-02-03 and 2014-02-03

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Demeton, Total.

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

The samples were collected between the dates of 2014-02-03 and 2014-02-03

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

loroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDT criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.001 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116268

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for DDT (Dichlorodiphenyltrichloroethane).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Total DDT criterion for the protection of human health from consumption of organisms only is 0.00059 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161315, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

34607

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

The method detection limit for all 3 of the non-detect samples was greater than the criteria: thus the data was not used in this assessment.

Data Reference:

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The 4,4' DDT criterion for the protection of human health from the consumption of water and organisms is 0.00022 ug/L (USEPA Nationally Recommended Criteria, 2006).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station Samples collected at station 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples were collected on 11/26/2007, 4/7/2008, and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):


DECISION ID	157538	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Desethyl-Atrazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157538, Desethyl-Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324518

Pollutant:

Desethyl-Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Desethyl-Atrazine.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for desethyl-atrazine is the USEPA Aquatic Life Benchmark of 1000 ug/L for a nonvascular plant (acute) for triazine DEA degradate.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157538, Desethyl-Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324521

Pollutant:

Desethyl-Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Desethyl-Atrazine.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for desethyl-atrazine is the USEPA Aquatic Life Benchmark of 1000 ug/L for a nonvascular plant (acute) for triazine DEA degradate.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):


DECISION ID	167494	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Dacthal
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 41275 has been replaced by LOE 349336 and LOE 41227 has been replaced by LOE 349330 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167494, Dacthal	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349330

Pollutant:

Dacthal

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167494, Dacthal	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349336

Pollutant:

Dacthal

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 167494, Dacthal	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116265

Pollutant:

Dacthal

LOE Subgroup:

Pollutant-Water

DECISION ID

167496

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Dichlofenthion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167496, Dichlofenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123984

Pollutant:

Dichlofenthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dichlofenthion, Total. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167496, Dichlofenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123996

Pollutant:

Dichlofenthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dichlofenthion, Total. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167496, Dichlofenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123997

Pollutant:

Dichlofenthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dichlofenthion, Total. Ten samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

lign="left" valign="top" width="33%">Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dacthal. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA Lifetime Health advisory level for Dacthal is 0.07 mg/L. Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167494, Dacthal	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116266 Pollutant: Dacthal LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dacthal. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Dacthal is the USEPA Aquatic Life Benchmark of > 11000 ug/L for a nonvascular plant (acute) and vascular plant (acute). The benchmark was derived from a \greater-than\" value (for example, > 265,000) and may overestimate toxicity." Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167494, Dacthal	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108347 Pollutant: Dacthal LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dacthal. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Dacthal is the USEPA Aquatic Life Benchmark of > 11000 ug/L for a nonvascular plant (acute) and vascular plant (acute). The benchmark was derived from a \greater-than\" value (for example, > 265,000) and may overestimate toxicity." Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167494, Dacthal	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 123944 Pollutant: Dacthal LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dacthal, Total. Five sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. USEPA's Lifetime Health advisory level for Dacthal is 0.07 mg/L as stated on page 3 of the 2011 edition of the drinking water standards and health advisories. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: 2011 Edition of the Drinking Water Standards and Health Advisories Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167494, Dacthal	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116264 Pollutant: Dacthal LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dacthal.

DECISION ID

167497

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Dichlorvos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 41650 has been replaced by LOE 349431 and LOE 41713 has been replaced by LOE 349416 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167497, Dichlorvos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101468

Pollutant:

Dichlorvos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Dichlorvos is the USEPA Aquatic Life Benchmark of 0.0058 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167497, Dichlorvos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105923

Pollutant:

Dichlorvos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Dichlorvos is the USEPA Aquatic Life Benchmark of 0.0058 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167497, Dichlorvos

Region 1 idth="33%">Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Dacthal is the USEPA Aquatic Life Benchmark of > 11000 ug/L for a nonvascular plant (acute) and vascular plant (acute). The benchmark was derived from a \greater-than\" value (for example, > 265,000) and may overestimate toxicity."

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167494, Dacthal	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123943

Pollutant:

Dacthal

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dacthal, Total. Twenty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. USEPA's Lifetime Health advisory level for Dacthal is 0.07 mg/L as stated on page 3 of the 2011 edition of the drinking water standards and health advisories.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

2011 Edition of the Drinking Water Standards and Health Advisories

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this lin

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105922

Pollutant:

Dichlorvos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Dichlorvos is the USEPA Aquatic Life Benchmark of 0.0058 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167497, Dichlorvos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349431

Pollutant:

Dichlorvos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dichlorvos. Although a total of 3 samples were collected, 3 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167494, Dacthal	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124135

Pollutant:

Dacthal

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dacthal, Total. Twenty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. USEPA's Lifetime Health advisory level for Dacthal is 0.07 mg/L as stated on page 3 of the 2011 edition of the drinking water standards and health advisories.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

2011 Edition of the Drinking Water Standards and Health Advisories

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167494, Dacthal	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108349

Pollutant:

Dacthal

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dacthal.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Dacthal is the USEPA Aquatic Life Benchmark of > 11000 ug/L for a nonvascular plant (acute) and vascular plant (acute). The benchmark was derived from a \greater-than\" value (for example, > 265,000) and may overestimate toxicity."

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167494, Dacthal	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108348

Pollutant:

Dacthal

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dacthal.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Lifetime Health advisory level for Dacthal is 0.07 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

> Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for dichlorvos is the USEPA Aquatic Life Benchmark of 0.0058 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2007-11-26 and 2008-07-14 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 167497, Dichlorvos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 349416 Pollutant: Dichlorvos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dichlorvos. Although a total of 3 samples were collected, 3 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for dichlorvos is the USEPA Aquatic Life Benchmark of 0.0058 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2007-11-26 and 2008-07-14 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 167497, Dichlorvos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 105924 Pollutant: Dichlorvos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dichlorvos. Although a total of 3 samples were collected, 3 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Dichlorvos is the USEPA Aquatic Life Benchmark of 0.0058 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114RR5652). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-05-31 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	167498	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Dicrotophos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167498, Dicrotophos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116285

Pollutant:

Dicrotophos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Dicrotophos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA expected safe lifetime exposure limit in drinking water for Dicrotophos calculated using the IRIS Reference Dose, is 0.7 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.0001 mg/kg/day as the reference dose.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167498, Dicrotophos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116284

Pollutant:

Dicrotophos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Dicrotophos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):


DECISION ID	167495	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Deltamethrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167495, Deltamethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349379

Pollutant:

Deltamethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for deltamethrin is the USEPA Aquatic Life Benchmark of 0.000026 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167495, Deltamethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43621

Pollutant:

Deltamethrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167495, Deltamethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43622

Pollutant:

Deltamethrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167495, Deltamethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349365

Pollutant:

Deltamethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for deltamethrin is the USEPA Aquatic Life Benchmark of 0.000026 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .


DECISION ID	157552	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Dieldrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

107428

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protect human health from the consumption of water and organisms is 0.00014 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

107426

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protect human health from the consumption of water and organisms is 0.00014 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41777

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43719

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters sh


DECISION ID	157612	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Demeton
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116270

Pollutant:

Demeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Demeton, Total.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to Demeton is 0.1 ug/L.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116274

Pollutant:

Demeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Demeton, Total.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to Demeton is 0.1 ug/L.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123970

Pollutant:

Demeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Demeton-s, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123983

Pollutant:

Demeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Demeton-s, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessedall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for dieldrin is 61.8 ug/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124009

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dieldrin, Total. Twenty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322440

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science guidelines (NAS 1972) establish a maximum Dieldrin concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43720

Pollutant:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123982

Pollutant:

Demeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Demeton-s, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116275

Pollutant:

Demeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Demeton, Total.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157612, Demeton

Dieldrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for dieldrin is 61.8 ug/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41675

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Critert; PADDING-TOP: 3px; font-smooth: always">Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324508

Pollutant:

Demeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Demeton, Total.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to Demeton is 0.1 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116273

Pollutant:

Demeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Demeton, Total.

Data Reference:

SWAMP Data:

SWAMP

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116287

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dieldrin.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157552, Dieldrin

Region 1

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116271

Pollutant:

Demeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Demeton, Total.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Qua text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

LOE ID:

116286

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dieldrin.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

118081

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116276

Pollutant:

Demeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Demeton, Total.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to Demeton is 0.1 ug/L.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116272

Pollutant:

Demeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Demeton, Total.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to Demeton is 0.1 ug/L.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324503

Pollutant:

Demeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Demeton, Total.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157612, Demeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324501

Pollutant:

Demeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Demeton, Total.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to Demeton is 0.1 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

lign="left" valign="top" width="33%">SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protection of human health from consumption of organisms only is 0.00014 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

117435

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protection of human health from consumption of organisms only is 0.00014 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41683

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322442

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

DECISION ID

157538

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Desethyl-Atrazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157538, Desethyl-Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324518

Pollutant:

Desethyl-Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Desethyl-Atrazine.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for desethyl-atrazine is the USEPA Aquatic Life Benchmark of 1000 ug/L for a nonvascular plant (acute) for triazine DEA degradate.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157538, Desethyl-Atrazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324521

Pollutant:

Desethyl-Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Desethyl-Atrazine.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for desethyl-atrazine is the USEPA Aquatic Life Benchmark of 1000 ug/L for a nonvascular plant (acute) for triazine DEA degradate.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

7%">Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of 3 samples exceeded the water quality threshold for Dieldrin. Monitors collected 3 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish, 1 composite of Sacramento Sucker composed of 10 fish, and 1 composite of Smallmouth Bass composed of 6 fish. Because no composites were collected within the same averaging period, these composites represent 3 independent samples. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: National Academy of Science guidelines (NAS 1972) establish a maximum Dieldrin concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances. Guideline Reference: National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency Spatial Representation: Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP). Temporal Representation: Data for this line of evidence were collected between 2015-08-03 and 2015-08-03. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes. Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 322441 Pollutant: Dieldrin LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of 0 samples exceeded the water quality threshold for Dieldrin. Monitors collected 3 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish, 1 composite of Sacramento Sucker composed of 10 fish, and 1 composite of Smallmouth Bass composed of 6 fish. Because no composites were collected within the same averaging period, these composites represent 3 independent samples. These samples were not used in the assessment because the laboratory data reporting limits were above the objectives and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region

DECISION ID

167496

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Dichlofenthion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167496, Dichlofenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123984

Pollutant:

Dichlofenthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dichlofenthion, Total. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The modified OEHHA Fish Contaminant Goal for dieldrin in fish tissue is 0.32 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008)

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41803

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124010

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dieldrin, Total. Five sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123998

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dieldrin, Total. Twenty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

r 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167496, Dichlofenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 123996 Pollutant: Dichlofenthion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dichlofenthion, Total. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167496, Dichlofenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 123997 Pollutant: Dichlofenthion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dichlofenthion, Total. Ten samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	157595	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Dimethoate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 41745 has been replaced by LOE 349447 and LOE 41807 has been replaced by LOE 349461 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116294

Pollutant:

Dimethoate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dimethoate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116290

Pollutant:

Dimethoate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dimethoate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116288

Pollutant:

DECISION ID

167497

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Dichlorvos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 41650 has been replaced by LOE 349431 and LOE 41713 has been replaced by LOE 349416 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167497, Dichlorvos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101468

Pollutant:

Dichlorvos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Bth="67%">Dimethoate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dimethoate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116291

Pollutant:

Dimethoate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Dimethoate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guidelasin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Dichlorvos is the USEPA Aquatic Life Benchmark of 0.0058 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167497, Dichlorvos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105923

Pollutant:

Dichlorvos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Dichlorvos is the USEPA Aquatic Life Benchmark of 0.0058 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167497, Dichlorvos

Region 1 ine:

The evaluation guideline for Dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116293

Pollutant:

Dimethoate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dimethoate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124011

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105922

Pollutant:

Dichlorvos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Dichlorvos is the USEPA Aquatic Life Benchmark of 0.0058 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167497, Dichlorvos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349431

Pollutant:

Dichlorvos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Pollutant:

Dimethoate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dimethoate, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124024

Pollutant:

Dimethoate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for dichlorvos is the USEPA Aquatic Life Benchmark of 0.0058 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167497, Dichlorvos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349416

Pollutant:

Dichlorvos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for dichlorvos is the USEPA Aquatic Life Benchmark of 0.0058 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 167497, Dichlorvos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105924

Pollutant:

Dichlorvos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Dichlorvos is the USEPA Aquatic Life Benchmark of 0.0058 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124023 Pollutant: Dimethoate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dimethoate, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing P


DECISION ID	167498	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Dicrotophos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167498, Dicrotophos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116285

Pollutant:

Dicrotophos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Dicrotophos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167498, Dicrotophos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116284

Pollutant:

Dicrotophos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Dicrotophos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

olicy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 349461 Pollutant: Dimethoate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Dimethoate. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2007-11-26 and 2008-07-14 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 349447 Pollutant: Dimethoate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Dimethoate. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2007-11-26 and 2008-07-14 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116292 Pollutant: Dimethoate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Dimethoate. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 324682 Pollutant: Dimethoate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Dimethoate. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 324688 Pollutant: Dimethoate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Dimethoate. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The California Department of Health Services notification level for dimethoate is 1 ug/L. Guideline Reference: CDPH Archived Advisory Levels for Drinking Water. Archived Advisory Levels are currently considered Notification Levels. Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 324676 Pollutant: Dimethoate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Dimethoate. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP


DECISION ID	157552	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Dieldrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

107428

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protect human health from the consumption of water and organisms is 0.00014 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

107426

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protect human health from the consumption of water and organisms is 0.00014 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1

DECISION ID	157553	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Disulfoton
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Fourteen lines of evidence are available in the administrative record to assess this pollutant. One of 67 samples exceed the Municipal & Domestic Supply beneficial use objective for the Not Recorded fraction of water. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of 67 samples exceed the Municipal & Domestic Supply beneficial use objective for the Not Recorded fraction of water and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

25638

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

One of the 41 disulfoton samples collected in the mainstem Russian River exceeds the evaluation guideline. Sample concentrations range from non-detect (with a reporting limit of 0.050 ug/l) to detected but not quantified with a concentration of at least 0.050 ug/l. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008).

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41777

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43719

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters sh

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Per "Water Quality Criteria 1972" (USEPA 1973): The instantaneous maximum water quality criterion for disulfoton for the protection of freshwater aquatic life is 0.05 ug/l.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Temporal Representation:

At the Alexander Valley Bridge site, samples were collected over 2 site visits at each site during June 2001. At the Cloverdale and Healdsburg Memorial Beach sites, samples were collected over 22 site visits at each site from June 2001 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

46525

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 26 disulfoton samples collected in the mainstem Russian River exceeds the evaluation guideline as all of the samples were either measured as non-detect or were measured as detected but not quantified. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008). This LOE and LOE 26524 contain data originally evaluated in LOE 25638, which included data from a site that is not in this water body. The data from LOE 25638 have been split into two LOEs, with data now evaluated under the correct water body.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterionall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for dieldrin is 61.8 ug/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124009

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dieldrin, Total. Twenty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322440

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Revised Draft of the 2007 Review of the Monitoring Data for the Irrigated Lands Regulatory Conditional Waiver Program

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43720

Pollutant:

Evaluation Guideline:

Per "Water Quality Criteria 1972" (USEPA 1973): The instantaneous maximum water quality criterion for disulfoton for the protection of freshwater aquatic life is 0.05 ug/l.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Samples were collected from the mainstem Russian River at 3 locations as follows: (1) at Cloverdale (SWAMP Station ID 114RRCLO1), (2) downstream of the Cloverdale Water Treatment Plant (SWAMP Station ID 114CLOSTP), and (3) at Alexandar Valley (SWAMP Station ID 114RRALEX). Samples were collected from well-mixed flows in glides or riffles.

Temporal Representation:

At the Alexander Valley Bridge site, samples were collected over 2 site visits at each site during June 2001. At the Cloverdale site samples were collected over 19 site visits from June 2001 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324694

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Disulfoton.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water lifetime health advisory for disulfoton is 0.7 ug/L. The Lifetime HA is based on exposure of a 70-kg adult consuming 2 liters of a water a day.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324706

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Disulfoton is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324710

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Dieldrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for dieldrin is 61.8 ug/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41675

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116287

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dieldrin.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157552, Dieldrin

Region 1

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Disulfoton is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

103577

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Disulfoton is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic).

Guideline Reference text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116286

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dieldrin.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

118081

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

103579

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Disulfoton is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protection of human health from consumption of organisms only is 0.00014 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

117435

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protection of human health from consumption of organisms only is 0.00014 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

LOE ID:

106525

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Disulfoton is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116295

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Disulfoton.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water lifetime health advisory for disulfoton is 0.7 µg/L. The Lifetime HA is based on exposure of a 70-kg adult consuming 2 liters of a water a day.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116296

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Disulfoton.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water lifetime health advisory for disulfoton is 0.7 µg/L. The Lifetime HA is based on exposure of a 70-kg adult consuming 2 liters of a water a day.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line ofalign="top" width="67%">Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41683

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322442

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116297

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Disulfoton.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water lifetime health advisory for disulfoton is 0.7 µg/L. The Lifetime HA is based on exposure of a 70-kg adult consuming 2 liters of a water a day.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

106524

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Disulfoton is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

103576

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Disulfoton is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic).

Guideline Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322441

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of 0 samples exceeded the water quality threshold for Dieldrin. Monitors collected 3 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish, 1 composite of Sacramento Sucker composed of 10 fish, and 1 composite of Smallmouth Bass composed of 6 fish. Because no composites were collected within the same averaging period, these composites represent 3 independent samples. These samples were not used in the assessment because the laboratory data reporting limits were above the objectives and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

103578

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Disulfoton is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

op" width="33%">Evaluation Guideline: The modified OEHHA Fish Contaminant Goal for dieldrin in fish tissue is 0.32 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008) Guideline Reference: Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene Spatial Representation: Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP). Temporal Representation: Data for this line of evidence were collected between 2015-08-03 and 2015-08-03. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes. Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 41803 Pollutant: Dieldrin LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protect human health from the consumption of water and organisms is 0.00014 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124010 Pollutant: Dieldrin LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dieldrin, Total. Five sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protect human health from the consumption of water and organisms is 0.00014 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157552, Dieldrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 123998 Pollutant: Dieldrin LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dieldrin, Total. Twenty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protect human health from the consumption of water and organisms is 0.00014 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	157554	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Diuron
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 116298 has been replaced by LOE 349509 and LOE 116301 has been replaced by LOE 349494 due to a reassessment of data using the UC Davis Aquatic Life Criterion threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157554, Diuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116299

Pollutant:

Diuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Diuron.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA health advisory for one-in-a-million incremental cancer risk estimate calculated as a drinking water standard for diuron is 2 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157554, Diuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349509

Pollutant:

Diuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Diuron.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Aquatic life should not be affected unacceptably if the 4-day average concentration of diuron does not exceed 1.3 ug/L (UC Davis Aquatic Life Criteria).

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: III. Diuron. Reviews of Environmental Contamination and Toxicology 216:105-141.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157554, Diuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349494

DECISION ID

157595

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Dimethoate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 41745 has been replaced by LOE 349447 and LOE 41807 has been replaced by LOE 349461 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116294

Pollutant:

Dimethoate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dimethoate.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Dimethoate is the USEPA Aquatic Life Benc width="33%">Pollutant:

Diuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Diuron.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Aquatic life should not be affected unacceptably if the 4-day average concentration of diuron does not exceed 1.3 ug/L (UC Davis Aquatic Life Criteria).

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: III. Diuron. Reviews of Environmental Contamination and Toxicology 216:105-141.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157554, Diuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324728

Pollutant:

Diuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Diuron.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Aquatic life should not be affected unacceptably if the 4-day average concentration of diuron does not exceed 1.3 ug/L (UC Davis Aquatic Life Criteria).

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: III. Diuron. Reviews of Environmental Contamination and Toxicology 216:105-141.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157554, Diuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324736

Pollutant:

Diuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Diuron.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Aquatic life should not be affected unacceptably if the 4-day average concentration of diuron does not exceed 1.3 ug/L (UC Davis Aquatic Life Criteria).

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: III. Diuron. Reviews of Environmental Contamination and Toxicology 216:105-141.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157554, Diuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324727

Pollutant:

Diuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Diuron.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA health advisory for one-in-a-million incremental cancer risk estimate calculated as a drinking water standard for diuron is 2 ug/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

hmark of 0.5 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116290 Pollutant: Dimethoate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dimethoate. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116288 Pollutant: Dimethoate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dimethoate. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116291 Pollutant: Dimethoate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Dimethoate. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guidel


DECISION ID	157555	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Dyfonate (Fonofos or Fonophos)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

tate_board/2012/ref3982.zip" >OPP Pesticide Ecotoxicity Database. <

Line of Evidence (LOE) for Decision ID 157555, Dyfonate (Fonofos or Fonophos)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41847

Pollutant:

Dyfonate (Fonofos or Fonophos)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for fonofos is 0.45 ug/L.

Guideline Reference:

The evaluation guideline for Dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116293

Pollutant:

Dimethoate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Dimethoate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124011

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157555, Dyfonate (Fonofos or Fonophos)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324946

Pollutant:

Dyfonate (Fonofos or Fonophos)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Fonofos.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for fonofos is the maximum acceptable toxicant concentration (MATC) of 0.45 ug/L. The MATC is calculated as the geometric mean of the lowest observed effect concentration (LOEC) of 0.64 ug/L and the no observed effect concentration (NOEC) of 0.31 ug/L, as determined in a 21 day toxicity study with the water flea, Daphnia magna. Threshold values (LOEC and NOEC) are from USEPA Office of Pesticide Programs Ecotoxicity database.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157555, Dyfonate (Fonofos or Fonophos)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

Pollutant:

Dimethoate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dimethoate, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124024

Pollutant:

Dimethoate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Pollutant:

Dyfonate (Fonofos or Fonophos)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Fonofos.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for fonofos is 0.45 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157555, Dyfonate (Fonofos or Fonophos)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116352

Pollutant:

Dyfonate (Fonofos or Fonophos)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Fonofos.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124023

Pollutant:

Dimethoate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dimethoate, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349461

Pollutant:

Dimethoate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157595, Dimethoate

Region 1

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for fonofos is 0.45 ug/L.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157555, Dyfonate (Fonofos or Fonophos)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41831

Pollutant:

Dyfonate (Fonofos or Fonophos)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for fonofos is 0.45 ug/L.

Guideline Reference:

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157555, Dyfonate (Fonofos or Fonophos)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116353

Pollutant:

Dyfonate (Fonofos or Fonophos)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Fonofos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for fonofos is 0.45 ug/L.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157555, Dyfonate (Fonofos or Fonophos)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116354

Pollutant:

Dyfonate (Fonofos or Fonophos)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Fonofos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for fonofos is 0.45 ug/L.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

always">Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157595, Dimethoate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA


DECISION ID	157556	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Endosulfan
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157556, Endosulfan	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33161

Pollutant:

Endosulfan

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 3 samples exceeded the criteria.

Data Reference:

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Water Quality Control Plan for the North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. The endosulfan criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.056 ug/L. This value corresponds to the sum of alpha-endosulfan and beta-endosulfan (USEPA National Recommended Water Quality Criteria, 2006).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples collected between 11/26/2007, 4/7/2008, and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157556, Endosulfan	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322457

Pollutant:

Endosulfan

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science guidelines (NAS 1972) establish a maximum Endosulfan, Total concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157556, Endosulfan	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322448

DECISION ID

157553

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Disulfoton
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Fourteen lines of evidence are available in the administrative record to assess this pollutant. One of 67 samples exceed the Municipal & Domestic Supply beneficial use objective for the Not Recorded fraction of water. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of 67 samples exceed the Municipal & Domestic Supply beneficial use objective for the Not Recorded fraction of water and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

25638

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

op" width="33%">Pollutant:

Endosulfan

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The modified OEHHA Fish Contaminant Goal for endosulfan (l and ll) in fish tissue is 13,000 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008; USEPA, 2000)

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Guideline Reference:

Guidance for Assessing Chemical Contaminant Data for Use In Fish Advisories Volume 1: Fish Sampling and Analysis

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Line of Evidence (LOE) for Decision ID 157556, Endosulfan	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322446

Pollutant:

Endosulfan

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Per "Water Quality Criteria 1972" (USEPA 1973): The instantaneous maximum water quality criterion for disulfoton for the protection of freshwater aquatic life is 0.05 ug/l.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

46525

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterionmposites: 1 composite of Sacramento Pikeminnow composed of 10 fish, 1 composite of Sacramento Sucker composed of 10 fish, and 1 composite of Smallmouth Bass composed of 6 fish. Because no composites were collected within the same averaging period, these composites represent 3 independent samples.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157556, Endosulfan	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116320

Pollutant:

Endosulfan

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for total endosulfan, which is the sum of alpha endosulfan and beta endosulfan, to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Revised Draft of the 2007 Review of the Monitoring Data for the Irrigated Lands Regulatory Conditional Waiver Program

Evaluation Guideline:

Per "Water Quality Criteria 1972" (USEPA 1973): The instantaneous maximum water quality criterion for disulfoton for the protection of freshwater aquatic life is 0.05 ug/l.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Samples were collected from the mainstem Russian River at 3 locations as follows: (1) at Cloverdale (SWAMP Station ID 114RRCLO1), (2) downstream of the Cloverdale Water Treatment Plant (SWAMP Station ID 114CLOSTP), and (3) at Alexandar Valley (SWAMP Station ID 114RRALEX). Samples were collected from well-mixed flows in glides or riffles.

Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324694

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Disulfoton.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water lifetime health advisory for disulfoton is 0.7 ug/L. The Lifetime HA is based on exposure of a 70-kg adult consuming 2 liters of a water a day.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157556, Endosulfan	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116321

Pollutant:

Endosulfan

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Endosulfan, Total criterion for the protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157556, Endosulfan	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116319

Pollutant:

Endosulfan

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Endosulfan, Total criterion for the protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157556, Endosulfan	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116323

Pollutant:

Endosulfan

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

d> QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 324706 Pollutant: Disulfoton LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Disulfoton. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Disulfoton is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 324710 Pollutant: Disulfoton LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Disulfoton. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Disulfoton is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 103577 Pollutant: Disulfoton LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Disulfoton. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Disulfoton is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic). Guideline Reference


DECISION ID	167499	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Endosulfan sulfate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167499, Endosulfan sulfate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42097

Pollutant:

Endosulfan sulfate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

103579

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Disulfoton is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167499, Endosulfan sulfate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116318

Pollutant:

Endosulfan sulfate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan Sulfate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for endosulfan sulfate to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167499, Endosulfan sulfate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42033

Pollutant:

Endosulfan sulfate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life 24 hour average maximum for endodulfan sulfate is 0.056 µg/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167499, Endosulfan sulfate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41979

Pollutant:

Endosulfan sulfate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life 24 hour average maximum for endodulfan sop" width="33%">LOE ID:

106525

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Disulfoton is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116295

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Disulfoton.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water lifetime health advisory for disulfoton is 0.7 µg/L. The Lifetime HA is based on exposure of a 70-kg adult consuming 2 liters of a water a day.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116296

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Disulfoton.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water lifetime health advisory for disulfoton is 0.7 µg/L. The Lifetime HA is based on exposure of a 70-kg adult consuming 2 liters of a water a day.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116297

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Disulfoton.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water lifetime health advisory for disulfoton is 0.7 µg/L. The Lifetime HA is based on exposure of a 70-kg adult consuming 2 liters of a water a day.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

106524

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167499, Endosulfan sulfate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116317

Pollutant:

Endosulfan sulfate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan Sulfate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for endosulfan sulfate to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167499, Endosulfan sulfate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116315

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Disulfoton is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

103576

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Disulfoton is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic).

Guideline Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

Pollutant:

Endosulfan sulfate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan Sulfate.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for endosulfan sulfate to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167499, Endosulfan sulfate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116316

Pollutant:

Endosulfan sulfate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan Sulfate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for endosulfan sulfate to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157553, Disulfoton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

103578

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Disulfoton is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

al Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167499, Endosulfan sulfate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 41643 Pollutant: Endosulfan sulfate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan sulfate. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endosulfan sulfate to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan


DECISION ID	157557	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Endrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322472

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

DECISION ID

157554

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Diuron
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 116298 has been replaced by LOE 349509 and LOE 116301 has been replaced by LOE 349494 due to a reassessment of data using the UC Davis Aquatic Life Criterion threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

width="67%">National Academy of Science guidelines (NAS 1972) establish a maximum Endrin concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.

Line of Evidence (LOE) for Decision ID 157554, Diuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116299

Pollutant:

Diuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Diuron.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA health advisory for one-in-a-million incremental cancer risk estimate calculated as a drinking water standard for diuron is 2 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157554, Diuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349509

Pollutant:

Diuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Diuron.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Aquatic life should not be affected unacceptably if the 4-day average concentration of diuron does not exceed 1.3 ug/L (UC Davis Aquatic Life Criteria).

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: III. Diuron. Reviews of Environmental Contamination and Toxicology 216:105-141.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157554, Diuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349494

Pollutant:

Diuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Diuron.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Aquatic life should not be affected unacceptably if the 4-day average concentration of diuron does not exceed 1.3 ug/L (UC Davis Aquatic Life Criteria).

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: III. Diuron. Reviews of Environmental Contamination and Toxicology 216:105-141.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157554, Diuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324728

Pollutant:

Diuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Diuron.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322477

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The modified OEHHA Fish Contaminant Goal for endrin in fish tissue is 660 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008; USEPA, 2000)

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Guideline Reference:

Guidance for Assessing Chemical Contaminant Data for Use In Fish Advisories Volume 1: Fish Sampling and Analysis

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Progra

Evaluation Guideline:

Aquatic life should not be affected unacceptably if the 4-day average concentration of diuron does not exceed 1.3 ug/L (UC Davis Aquatic Life Criteria).

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: III. Diuron. Reviews of Environmental Contamination and Toxicology 216:105-141.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157554, Diuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324736

Pollutant:

Diuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Diuron.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Aquatic life should not be affected unacceptably if the 4-day average concentration of diuron does not exceed 1.3 ug/L (UC Davis Aquatic Life Criteria).

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: III. Diuron. Reviews of Environmental Contamination and Toxicology 216:105-141.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157554, Diuron

Region 1

Rusm (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322485

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science guidelines (NAS 1972) establish a maximum Endrin concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42126

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

sian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324727

Pollutant:

Diuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Diuron.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA health advisory for one-in-a-million incremental cancer risk estimate calculated as a drinking water standard for diuron is 2 ug/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endrin. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.036 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116334 Pollutant: Endrin LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endrin. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect of human health from the consumption of water and organisms is 0.76 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 42039 Pollutant: Endrin LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endrin. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect human health from consumption of organisms only is 0.81ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 43784 Pollutant: Endrin LOE Subgroup: Pollutant-Sediment Matrix: Sediment Fraction: T


DECISION ID	157555	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Dyfonate (Fonofos or Fonophos)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157555, Dyfonate (Fonofos or Fonophos)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41847

Pollutant:

Dyfonate (Fonofos or Fonophos)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for fonofos is 0.45 ug/L.

Guideline Reference:

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157555, Dyfonate (Fonofos or Fonophos)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324946

Pollutant:

Dyfonate (Fonofos or Fonophos)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Fonofos.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157555, Dyfonate (Fonofos or Fonophos)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for endrin is 207 ug/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116328

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endrin.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect human health from consumption of organisms only is 0.81ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116332

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endrin.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.036 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42064

324938

Pollutant:

Dyfonate (Fonofos or Fonophos)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Fonofos.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for fonofos is 0.45 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157555, Dyfonate (Fonofos or Fonophos)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116352

Pollutant:

Dyfonate (Fonofos or Fonophos)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Fonofos.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for fonofos is 0.45 ug/L.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157555, Dyfonate (Fonofos or Fonophos)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41831

Pollutant:

Dyfonate (Fonofos or Fonophos)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for fonofos is 0.45 ug/L.

Guideline Reference:

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157555, Dyfonate (Fonofos or Fonophos)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116353

Pollutant:

Dyfonate (Fonofos or Fonophos)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Fonofos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for fonofos is 0.45 ug/L.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157555, Dyfonate (Fonofos or Fonophos)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116354

Pollutant:

Dyfonate (Fonofos or Fonophos)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Fonofos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for fonofos is 0.45 ug/L.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

td align="left" valign="top" width="33%">Pollutant: Endrin LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endrin. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect of human health from the consumption of water and organisms is 0.76 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 42118 Pollutant: Endrin LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endrin. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.036 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 43783 Pollutant: Endrin LOE Subgroup: Pollutant-Sediment Matrix: Sediment Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Endrin. Data Reference: Statewide Stream Pollution Trends Study 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for endrin is 207 ug/Kg dry weight (MacDonald et al. 2000). Guideline Reference: Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ] Temporal Representation: Data was collected on a single day 10/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116329 Pollutant: Endrin LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endrin. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.036 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116330 Pollutant: Endrin LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endrin. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect of human health from the consumption of water and organisms is 0.76 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116331 Pollutant: Endrin LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endrin. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect human health from consumption of organisms only is 0.81ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	157556	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Endosulfan
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157556, Endosulfan	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33161

Pollutant:

Endosulfan

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 3 samples exceeded the criteria.

Data Reference:

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples collected between 11/26/2007, 4/7/2008, and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157556, Endosulfan	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322457

Pollutant:

Endosulfan

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157556, Endosulfan	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322448

DECISION ID

104265

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Endrin Ketone
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective for the MUN beneficial use(s). Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceed the objective for the MUN beneficial use(s) and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 104265, Endrin Ketone	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124035

Pollutant:

Endrin Ketone

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 40 samples exceed the criterion for Endrin Ketone, Total. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Pollutant:

Endosulfan

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Guideline Reference:

Guidance for Assessing Chemical Contaminant Data for Use In Fish Advisories Volume 1: Fish Sampling and Analysis

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157556, Endosulfan	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322446

Pollutant:

Endosulfan

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of 3 samples exceeded the water quality threshold for Endosulfan. Monitors collected 3 co" valign="top" width="67%">Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect of human health from the consumption of water and organisms is 0.76 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 104265, Endrin Ketone	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124025

Pollutant:

Endrin Ketone

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 40 samples exceed the criterion for Endrin Ketone, Total. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 104265, Endrin Ketone	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124036

Pollutant:

Endrin Ketone

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 10 samples exceed the criterion for Endrin Ketone, Total. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

mposites: 1 composite of Sacramento Pikeminnow composed of 10 fish, 1 composite of Sacramento Sucker composed of 10 fish, and 1 composite of Smallmouth Bass composed of 6 fish. Because no composites were collected within the same averaging period, these composites represent 3 independent samples. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: National Academy of Science guidelines (NAS 1972) establish a maximum Endosulfan, Total concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances. Guideline Reference: National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency Spatial Representation: Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP). Temporal Representation: Data for this line of evidence were collected between 2015-08-03 and 2015-08-03. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes. Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157556, Endosulfan	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116320 Pollutant: Endosulfan LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The established numeric criteria for total endosulfan, which is the sum of alpha endosulfan and beta endosulfan, to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157556, Endosulfan	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116321 Pollutant: Endosulfan LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The Endosulfan, Total criterion for the protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157556, Endosulfan	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116319 Pollutant: Endosulfan LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The Endosulfan, Total criterion for the protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157556, Endosulfan	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116323 Pollutant: Endosulfan LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The established numeric criteria for total endosulfan, which is the sum of alpha endosulfan and beta endosulfan, to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	167500	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Endrin aldehyde
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167500, Endrin aldehyde	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42090

Pollutant:

Endrin aldehyde

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167500, Endrin aldehyde	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116324

Pollutant:

Endrin aldehyde

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endrin Aldehyde.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin aldehyde to protect human health from consumption of organisms only is 0.81ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167500, Endrin aldehyde	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116327

Pollutant:

Endrin aldehyde

DECISION ID

167499

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Endosulfan sulfate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167499, Endosulfan sulfate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42097

Pollutant:

Endosulfan sulfate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endrin Aldehyde.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin aldehyde to protect of human health from the consumption of water and organisms is 0.76 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167500, Endrin aldehyde	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116325

Pollutant:

Endrin aldehyde

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endrin Aldehyde.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin aldehyde to protect of human health from the consumption of water and organisms is 0.76 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167500, Endrin aldehyde	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42011

Pollutant:

Endrin aldehyde

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167500, Endrin aldehyde	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116326

Pollutant:

Endrin aldehyde

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endrin Aldehyde.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin aldehyde to protect human health from consumption of organisms only is 0.81ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

colspan="2">Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167499, Endosulfan sulfate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116318 Pollutant: Endosulfan sulfate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan Sulfate. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The established numeric criteria for endosulfan sulfate to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167499, Endosulfan sulfate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 42033 Pollutant: Endosulfan sulfate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan sulfate. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA national ambient water quality criterion for freshwater aquatic life 24 hour average maximum for endodulfan sulfate is 0.056 µg/L. Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167499, Endosulfan sulfate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 41979 Pollutant: Endosulfan sulfate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan sulfate. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA national ambient water quality criterion for freshwater aquatic life 24 hour average maximum for endodulfan sulfate is 0.056 µg/L. Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167499, Endosulfan sulfate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116317 Pollutant: Endosulfan sulfate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan Sulfate. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The established numeric criteria for endosulfan sulfate to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167499, Endosulfan sulfate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116315

DECISION ID

167501

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Esfenvalerate/Fenvalerate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167501, Esfenvalerate/Fenvalerate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349601

Pollutant:

Esfenvalerate/Fenvalerate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Pollutant:

Endosulfan sulfate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan Sulfate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for endosulfan sulfate to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167499, Endosulfan sulfate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116316

Pollutant:

Endosulfan sulfate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan Sulfate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for endosulfan sulfate to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

The chronic criterion for esfenvalerate is 0.3 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of esfenvalerate were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.

Guideline Reference:

Water Quality Criteria Report for Esfenvalerate

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 167501, Esfenvalerate/Fenvalerate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349554

Pollutant:

Esfenvalerate/Fenvalerate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Esfenvalerate

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167501, Esfenvalerate/Fenvalerate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43957

Pollutant:

Esfenvalerate/Fenvalerate

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for esfenvalerate/fenvalerate is the median lethal concentration (LC50) of 1.5 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1.5 ug/g is the geometric mean of LC50 values for esfenvalerate/fenvalerate from Amweg et al. (2005).

Guideline Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167501, Esfenvalerate/Fenvalerate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43956

Pollutant:

Esfenvalerate/Fenvalerate

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167499, Endosulfan sulfate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA


DECISION ID	157557	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Endrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322472

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

DECISION ID

157590

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Ethion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 102402 has been replaced by LOE 349665, LOE 102004 has been replaced by LOE 349722, LOE 106411 has been replaced by LOE 349640, LOE 102401 has been replaced by LOE 349705, LOE 106413 has been replaced by LOE 349682, and LOE 102008 has been replaced by LOE 349639 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349665

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322477

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Guideline Reference:

Guidance for Assessing Chemical Contaminant Data for Use In Fish Advisories Volume 1: Fish Sampling and Analysis

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Progra>Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ethion is the USEPA Aquatic Life Benchmark of 0.028 ug/L for invertebrates (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349682

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ethion is the USEPA Aquatic Life Benchmark of 0.028 ug/L for invertebrates (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157590, Ethion

Region 1

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322485

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42126

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

CCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324837

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ethion is the USEPA Aquatic Life Benchmark of 0.028 ug/L for invertebrates (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324843

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ethion.

Data Reference:

SWAMP Data:

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116334

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endrin.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect of human health from the consumption of water and organisms is 0.76 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA expected safe lifetime exposure limit in drinking water for Ethion, calculated using the IRIS Reference Dose, is 3.5 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.0005 mg/kg/day as the reference dose.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324839

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ethion is the USEPA Aquatic Life Benchmark of 0.028 ug/L for invertebrates (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42039

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43784

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Ttop" width="67%">SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124048

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Ethion, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349640

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for endrin is 207 ug/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116328

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endrin.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect human health from consumption of organisms only is 0.81ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Fed width="33%">Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ethion is the USEPA Aquatic Life Benchmark of 0.028 ug/L for invertebrates (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349639

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116332

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endrin.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.036 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42064

Evaluation Guideline:

The evaluation guideline for ethion is the USEPA Aquatic Life Benchmark of 0.028 ug/L for invertebrates (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349722

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ethion is the USEPA Aquatic Life Benchmark of 0.028 ug/L for invertebrates (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349705

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ethion is the USEPA Aquatic Life Benchmark of 0.028 ug/L for invertebrates (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116336

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ethion.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

All waters shall be maintatd align="left" valign="top" width="33%">Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42118

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43783

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for endrin is 207 ug/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157557, Endrin

Region 1

Russiained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124047

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Ethion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are n River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116329

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endrin.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.036 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116330

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endrin.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect of human health from the consumption of water and organisms is 0.76 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157557, Endrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116331

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endrin.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect human health from consumption of organisms only is 0.81ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116337 Pollutant: Ethion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Ethion. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA expected safe lifetime exposure limit in drinking water for Ethion, calculated using the IRIS Reference Dose, is 3.5 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.0005 mg/kg/day as the reference dose. Guideline Reference: IRIS Reference Summary (Various Pollutants) Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116335 Pollutant: Ethion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Ethion. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA expected safe lifetime exposure limit in drinking water for Ethion, calculated using the IRIS Reference Dose, is 3.5 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.0005 mg/kg/day as the reference dose. Guideline Reference: IRIS Reference Summary (Various Pollutants) Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124037 Pollutant: Ethion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Ethion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	104265	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Endrin Ketone
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective for the MUN beneficial use(s). Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceed the objective for the MUN beneficial use(s) and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 104265, Endrin Ketone	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124035

Pollutant:

Endrin Ketone

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 40 samples exceed the criterion for Endrin Ketone, Total. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 104265, Endrin Ketone	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124025

Pollutant:

Endrin Ketone

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 40 samples exceed the criterion for Endrin Ketone, Total. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 104265, Endrin Ketone	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124036

Pollutant:

Endrin Ketone

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 10 samples exceed the criterion for Endrin Ketone, Total. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	157597	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Ethoprop
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157597, Ethoprop	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324855

Pollutant:

Ethoprop

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ethoprop.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ethoprop is the USEPA Aquatic Life Benchmark of 0.8 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157597, Ethoprop	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324857

Pollutant:

Ethoprop

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ethoprop.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ethoprop is the USEPA Aquatic Life Benchmark of 0.8 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157597, Ethoprop	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124049

Pollutant:

Ethoprop

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

DECISION ID

167500

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Endrin aldehyde
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167500, Endrin aldehyde	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42090

Pollutant:

Endrin aldehyde

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Gu align="left" valign="top" width="67%">None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Ethoprop, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157597, Ethoprop	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116341

Pollutant:

Ethoprop

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ethoprop.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167500, Endrin aldehyde	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116324

Pollutant:

Endrin aldehyde

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endrin Aldehyde.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin aldehyde to protect human health from consumption of organisms only is 0.81ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167500, Endrin aldehyde	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116327

Pollutant:

Endrin aldehyde

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Ethoprop is the USEPA Aquatic Life Benchmark of 0.8 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157597, Ethoprop	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116343

Pollutant:

Ethoprop

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Ethoprop.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Ethoprop is the USEPA Aquatic Life Benchmark of 0.8 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157597, Ethoprop	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116338

Pollutant:

Ethoprop

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Ethoprop.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Ethoprop is the USEPA Aquatic Life Benchmark of 0.8 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157597, Ethoprop	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124060

Pollutant:

Ethoprop

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Ethoprop, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endrin Aldehyde.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin aldehyde to protect of human health from the consumption of water and organisms is 0.76 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167500, Endrin aldehyde	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116325

Pollutant:

Endrin aldehyde

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endrin Aldehyde.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin aldehyde to protect of human health from the consumption of water and organisms is 0.76 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167500, Endrin aldehyde	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42011

Pollutant:

Endrin aldehyde

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167500, Endrin aldehyde	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116326

Pollutant:

Endrin aldehyde

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endrin Aldehyde.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin aldehyde to protect human health from consumption of organisms only is 0.81ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

ps://www.waterboards.ca.gov/water_issues/programs/tmdl/records/region_1/2008/ref2677.pdf">Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157597, Ethoprop	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116340 Pollutant: Ethoprop LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ethoprop. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Ethoprop is the USEPA Aquatic Life Benchmark of 0.8 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157597, Ethoprop	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116342 Pollutant: Ethoprop LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Ethoprop. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Ethoprop is the USEPA Aquatic Life Benchmark of 0.8 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157597, Ethoprop	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124059 Pollutant: Ethoprop LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Ethoprop, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157597, Ethoprop	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA


DECISION ID	167501	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Esfenvalerate/Fenvalerate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167501, Esfenvalerate/Fenvalerate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349601

Pollutant:

Esfenvalerate/Fenvalerate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

DECISION ID

167502

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Famphur
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167502, Famphur	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124073

Pollutant:

Famphur

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Famphur , Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167502, Famphur	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124061

Pollutant:

Famphur

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Famphur , Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167502, Famphur	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124074

Pollutant:

Famphur

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Famphur , Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

" width="33%">Evaluation Guideline: The chronic criterion for esfenvalerate is 0.3 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of esfenvalerate were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used. Guideline Reference: Water Quality Criteria Report for Esfenvalerate Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 167501, Esfenvalerate/Fenvalerate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 349554 Pollutant: Esfenvalerate/Fenvalerate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Esfenvalerate. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The chronic criterion for esfenvalerate is 0.3 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of esfenvalerate were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used. Guideline Reference: Water Quality Criteria Report for Esfenvalerate Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 167501, Esfenvalerate/Fenvalerate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 43957 Pollutant: Esfenvalerate/Fenvalerate LOE Subgroup: Pollutant-Sediment Matrix: Sediment Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Esfenvalerate/Fenvalerate, total. Data Reference: Statewide Stream Pollution Trends Study 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for esfenvalerate/fenvalerate is the median lethal concentration (LC50) of 1.5 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1.5 ug/g is the geometric mean of LC50 values for esfenvalerate/fenvalerate from Amweg et al. (2005). Guideline Reference: Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5 Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV] Temporal Representation: Data was collected on a single day 10/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167501, Esfenvalerate/Fenvalerate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 43956 Pollutant: Esfenvalerate/Fenvalerate LOE Subgroup: Pollutant-Sediment Matrix: Sediment Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Esfenvalerate/Fenvalerate, total. Data Reference: Statewide Stream Pollution Trends Study 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for esfenvalerate/fenvalerate is the median lethal concentration (LC50) of 1.5 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1.5 ug/g is the geometric mean of LC50 values for esfenvalerate/fenvalerate from Amweg et al. (2005). Guideline Reference: Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5 Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV] Temporal Representation: Data was collected on a single day 10/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan


DECISION ID	167503	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Fenchlorphos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167503, Fenchlorphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124087

Pollutant:

Fenchlorphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenchlorphos, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167503, Fenchlorphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124075

Pollutant:

Fenchlorphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenchlorphos, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167503, Fenchlorphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124086

Pollutant:

Fenchlorphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenchlorphos, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	157590	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Ethion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 102402 has been replaced by LOE 349665, LOE 102004 has been replaced by LOE 349722, LOE 106411 has been replaced by LOE 349640, LOE 102401 has been replaced by LOE 349705, LOE 106413 has been replaced by LOE 349682, and LOE 102008 has been replaced by LOE 349639 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349665

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ethion is the USEPA Aquatic Life Benchmark of 0.028 ug/L for invertebrates (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349682

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ethion is the USEPA Aquatic Life Benchmark of 0.028 ug/L for invertebrates (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324837

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ethion is the USEPA Aquatic Life Benchmark of 0.028 ug/L for invertebrates (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324843

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ethion.

Data Reference:

SWAMP Data:


DECISION ID	157603	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Fenitrothion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157603, Fenitrothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116349

Pollutant:

Fenitrothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Fenitrothion.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenitrothion is the USEPA Aquatic Life Benchmark of 0.087 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157603, Fenitrothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124100

Pollutant:

Fenitrothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenitrothion, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157603, Fenitrothion

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324839

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ethion is the USEPA Aquatic Life Benchmark of 0.028 ug/L for invertebrates (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124048

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Ethion, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349640

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116346

Pollutant:

Fenitrothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Fenitrothion.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenitrothion is the USEPA Aquatic Life Benchmark of 0.087 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157603, Fenitrothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116348

Pollutant:

Fenitrothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Fenitrothion.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenitrothion is the USEPA Aquatic Life Benchmark of 0.087 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157603, Fenitrothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116350

Pollutant:

Fenitrothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Fenitrothion.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenitrothion is the USEPA Aquatic Life Benchmark of 0.087 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ethion is the USEPA Aquatic Life Benchmark of 0.028 ug/L for invertebrates (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349639

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Line of Evidence (LOE) for Decision ID 157603, Fenitrothion

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324883

Pollutant:

Fenitrothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Fenitrothion.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for fenitrothion is the USEPA Aquatic Life Benchmark of 0.087 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integraprograms/tmdl/records/region_1/2018/ref4527.pdf" >Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157603, Fenitrothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324877

Pollutant:

Fenitrothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Fenitrothion.

Data Reference:

Evaluation Guideline:

The evaluation guideline for ethion is the USEPA Aquatic Life Benchmark of 0.028 ug/L for invertebrates (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349722

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ethion is the USEPA Aquatic Life Benchmark of 0.028 ug/L for invertebrates (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349705

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ethion is the USEPA Aquatic Life Benchmark of 0.028 ug/L for invertebrates (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116336

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ethion.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

All waters shall be maintated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for fenitrothion is the USEPA Aquatic Life Benchmark of 0.087 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157603, Fenitrothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124099

Pollutant:

Fenitrothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenitrothion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157603, Fenitrothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124088

Pollutant:

Fenitrothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenitrothion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157603, Fenitrothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116351

Pollutant:

Fenitrothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Fenitrothion.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenitrothion is the USEPA Aquatic Life Benchmark of 0.087 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157603, Fenitrothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116347

Pollutant:

Fenitrothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Fenitrothion.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenitrothion is the USEPA Aquatic Life Benchmark of 0.087 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

ined free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA expected safe lifetime exposure limit in drinking water for Ethion, calculated using the IRIS Reference Dose, is 3.5 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.0005 mg/kg/day as the reference dose. Guideline Reference: IRIS Reference Summary (Various Pollutants) Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124047 Pollutant: Ethion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Ethion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157590, Ethion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA


DECISION ID	167504	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Fenpropathrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167504, Fenpropathrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

44040

Pollutant:

Fenpropathrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for fenpropathrin is the median lethal concentration (LC50) of 1 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1 ug/g is the geometric mean of LC50 values for fenpropathrin from Ding et al. ( 2011).

Guideline Reference:

Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167504, Fenpropathrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349767

Pollutant:

Fenpropathrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenpropathrin is the USEPA Aquatic Life Benchmark of 0.0015 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 167504, Fenpropathrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349774

Pollutant:

Fenpropathrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenpropathrin is the USEPA Aquatic Life Benchmark of 0.0015 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167504, Fenpropathrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

44021

Pollutant:

Fenpropathrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan


DECISION ID	157597	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Ethoprop
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157597, Ethoprop	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324855

Pollutant:

Ethoprop

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ethoprop.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ethoprop is the USEPA Aquatic Life Benchmark of 0.8 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157597, Ethoprop	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324857

Pollutant:

Ethoprop

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ethoprop.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ethoprop is the USEPA Aquatic Life Benchmark of 0.8 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157597, Ethoprop	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124049

Pollutant:

Ethoprop

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

DECISION ID

167505

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Fensulfothion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167505, Fensulfothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124101

Pollutant:

Fensulfothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fensulfothion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167505, Fensulfothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124111

Pollutant:

Fensulfothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fensulfothion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167505, Fensulfothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124112

Pollutant:

Fensulfothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fensulfothion, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

align="left" valign="top" width="67%">None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Ethoprop, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157597, Ethoprop	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116341 Pollutant: Ethoprop LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ethoprop. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Ethoprop is the USEPA Aquatic Life Benchmark of 0.8 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157597, Ethoprop	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116343 Pollutant: Ethoprop LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Ethoprop. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Ethoprop is the USEPA Aquatic Life Benchmark of 0.8 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157597, Ethoprop

DECISION ID	157604	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Fenthion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157604, Fenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

110275

Pollutant:

Fenthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenthion is the USEPA Aquatic Life Benchmark of 0.013 ug/L for2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: right; PADDING-TOP: 3px; font-smooth: always">Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116338 Pollutant: Ethoprop LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Ethoprop. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Ethoprop is the USEPA Aquatic Life Benchmark of 0.8 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157597, Ethoprop	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124060 Pollutant: Ethoprop LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Ethoprop, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP). Temporal Representation: Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157604, Fenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 324892 Pollutant: Fenthion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Fenthion. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Fenthion is the USEPA Aquatic Life Benchmark of 0.013 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157604, Fenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 324895 Pollutant: Fenthion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Fenthion. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Fenthion is the USEPA Aquatic Life Benchmark of 0.013 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157604, Fenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 119016 Pollutant: Fenthion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Fenthion. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157597, Ethoprop	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157597, Ethoprop	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157597, Ethoprop	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157597, Ethoprop	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116339 Pollutant: Ethoprop LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Ethoprop. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Ethoprop is the USEPA Aquatic Life Benchmark of 0.8 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program lign="top" width="67%">SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Fenthion is the USEPA Aquatic Life Benchmark of 0.013 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114RR5652). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157604, Fenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 119012 Pollutant: Fenthion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Fenthion. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Fenthion is the USEPA Aquatic Life Benchmark of 0.013 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114BS0310). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157604, Fenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 118438 Pollutant: Fenthion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Fenthion. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Fenthion is the USEPA Aquatic Life Benchmark of 0.013 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114RR5652). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157604, Fenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 118436 Pollutant: Fenthion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality:


DECISION ID	167502	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Famphur
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167502, Famphur	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124073

Pollutant:

Famphur

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Famphur , Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167502, Famphur	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124061

Pollutant:

Famphur

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Famphur , Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167502, Famphur	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124074

Pollutant:

Famphur

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Famphur , Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Fenthion. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Fenthion is the USEPA Aquatic Life Benchmark of 0.013 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP). Temporal Representation: Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157604, Fenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108759 Pollutant: Fenthion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Fenthion. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Fenthion is the USEPA Aquatic Life Benchmark of 0.013 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114BS0310). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157604, Fenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124113 Pollutant: Fenthion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenthion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157604, Fenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124124 Pollutant: Fenthion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenthion, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157604, Fenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124123 Pollutant: Fenthion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenthion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	167503	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Fenchlorphos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167503, Fenchlorphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124087

Pollutant:

Fenchlorphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenchlorphos, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167503, Fenchlorphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124075

Pollutant:

Fenchlorphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenchlorphos, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167503, Fenchlorphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124086

Pollutant:

Fenchlorphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenchlorphos, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	158482	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Fluoride
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 158482, Fluoride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328355

Pollutant:

Fluoride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A 1 mg/L criteria is the recommended maximum concentration of Fluoride in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158482, Fluoride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328346

Pollutant:

Fluoride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Primary Maximum Contaminant Level (MCL) for Fluoride, is 2 mg/l.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158482, Fluoride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

DECISION ID

157603

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Fenitrothion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157603, Fenitrothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116349

Pollutant:

Fenitrothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Fenitrothion.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenitrothion is the USEPA Aquatic Life Benchmark of 0.087 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157603, Fenitrothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124100

Pollutant:

Fenitrothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenitrothion, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

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Line of Evidence (LOE) for Decision ID 158482, Fluoride

Line of Evidence (LOE) for Decision ID 157603, Fenitrothion

LOE ID:

328364

Pollutant:

Fluoride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Primary Maximum Contaminant Level (MCL) for Fluoride, is 2 mg/l.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158482, Fluoride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328354

Pollutant:

Fluoride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A 1 mg/L criteria is the recommended maximum concentration of Fluoride in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158482, Fluoride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328343

Pollutant:

Fluoride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A 1 mg/L criteria is the recommended maximum concentration of Fluoride in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116346

Pollutant:

Fenitrothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Fenitrothion.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenitrothion is the USEPA Aquatic Life Benchmark of 0.087 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157603, Fenitrothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116348

Pollutant:

Fenitrothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Fenitrothion.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120893

Pollutant:

Fluoride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Primary Maximum Contaminant Level (MCL) for Fluoride, is 2 mg/l.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (USGS-11463980)

Temporal Representation:

The samples were collected between the dates of 2011-07-28 and 2011-07-28

Environmental Conditions:

QAPP Information:

QAPP not required for federal data

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 158482, Fluoride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120805

Pollutant:

Fluoride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A 1 mg/L criteria is the recommended maximum concentration of Fluoride in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (USGS-11463980)

Temporal Representation:

The samples were collected between the dates of 2011-07-28 and 2011-07-28

Environmental Conditions:

QAPP Information:

QAPP not required for federal data

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 158482, Fluoride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328362

Pollutant:

Fluoride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Primary Maximum Contaminant Level (MCL) for Fluoride, is 2 mg/l.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Fenitrothion is the USEPA Aquatic Life Benchmark of 0.087 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157603, Fenitrothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116350 Pollutant: Fenitrothion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Fenitrothion. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Fenitrothion is the USEPA Aquatic Life Benchmark of 0.087 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157603, Fenitrothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 324883 Pollutant: Fenitrothion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Fenitrothion. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for fenitrothion is the USEPA Aquatic Life Benchmark of 0.087 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157603, Fenitrothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 324877 Pollutant: Fenitrothion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Fenitrothion. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integra


DECISION ID	157558	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Glyphosate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 41863 has been replaced by LOE 349820 and LOE 41908 has been replaced by LOE 349814 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Quality Control Plan (Basin Plan) for the North Coast Region

The evaluation guideline for Glyphosate is the USEPA Aquatic Life Benchmark of 11900 ug/L for a vascular plant (acute).

Water Quality Control Plan (Basin Plan) for the North Coast Region

The evaluation guideline for fenitrothion is the USEPA Aquatic Life Benchmark of 0.087 ug/L for an invertebrate (chronic).

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

The samples were collected between the dates of 2014-02-03 and 2014-02-03

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

Line of Evidence (LOE) for Decision ID 157603, Fenitrothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenitrothion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Water Quality Control Plan (Basin Plan) for the North Coast Region

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Data was collected over the time period 2/6/2002-11/13/2006.

There are no known environmental conditions (e.g., seasonalin="top" width="33%">Guideline Reference:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Glyphosate, Total. Five sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for glyphosate is 700 ug/L.

Water Quality Control Plan (Basin Plan) for the North Coast Region

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Data was collected over the time period 10/23/2002-6/19/2003.

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157558, Glyphosate

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157603, Fenitrothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenitrothion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Water Quality Control Plan (Basin Plan) for the North Coast Region

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Data was collected over the time period 2/6/2002-11/13/2006.

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157603, Fenitrothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Fenitrothion.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

The evaluation guideline for Fenitrothion is the USEPA Aquatic Life Benchmark of 0.087 ug/L for an invertebrate (chronic).

The samples were collected at 1 monitoring site(s) (114RR5652)

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157603, Fenitrothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Fenitrothion.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

The evaluation guideline for Fenitrothion is the USEPA Aquatic Life Benchmark of 0.087 ug/L for an invertebrate (chronic).

The samples were collected at 1 monitoring site(s) (114BS0310)

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

und-color:#CCCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: right; PADDING-TOP: 3px; font-smooth: always">Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 324953 Pollutant: Glyphosate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Glyphosate. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for glyphosate is 700 ug/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2016-12-15 and 2017-02-07 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 324969 Pollutant: Glyphosate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Glyphosate. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Glyphosate is the USEPA Aquatic Life Benchmark of 11900 ug/L for a vascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2016-12-15 and 2017-02-07 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 324956 Pollutant: Glyphosate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Glyphosate. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Glyphosate is the USEPA Aquatic Life Benchmark of 11900 ug/L for a vascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2017-02-02 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1


DECISION ID	167504	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Fenpropathrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167504, Fenpropathrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

44040

Pollutant:

Fenpropathrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167504, Fenpropathrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349767

Pollutant:

Fenpropathrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenpropathrin is the USEPA Aquatic Life Benchmark of 0.0015 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 167504, Fenpropathrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349774

Pollutant:

Fenpropathrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenpropathrin is the USEPA Aquatic Life Benchmark of 0.0015 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167504, Fenpropathrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

44021

Pollutant:

Fenpropathrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

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Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 324962 Pollutant: Glyphosate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Glyphosate. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Glyphosate is the USEPA Aquatic Life Benchmark of 11900 ug/L for a vascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2016-12-15 and 2017-02-07 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 324951 Pollutant: Glyphosate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Glyphosate. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for glyphosate is 700 ug/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2017-02-02 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 324968 Pollutant: Glyphosate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Glyphosate. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Glyphosate is the USEPA Aquatic Life Benchmark of 11900 ug/L for a vascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2017-02-02 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157558, Glyphosate

Region 1

Russian River HU, Mi


DECISION ID	167505	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Fensulfothion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167505, Fensulfothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124101

Pollutant:

Fensulfothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fensulfothion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

LOE ID:

41882

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for glyphosate is 700 ug/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116355

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Glyphosate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167505, Fensulfothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124111

Pollutant:

Fensulfothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fensulfothion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167505, Fensulfothion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124112

Pollutant:

Fensulfothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fensulfothion, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

mdl/records/region_1/2018/ref4527.pdf" >Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Glyphosate is the USEPA Aquatic Life Benchmark of 11900 ug/L for a vascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 123947 Pollutant: Glyphosate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Glyphosate, Total. Five sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for glyphosate is 700 ug/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 10/23/2002-6/19/2003. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116358 Pollutant: Glyphosate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Glyphosate. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Glyphosate is the USEPA Aquatic Life Benchmark of 11900 ug/L for a vascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124125 Pollutant: Glyphosate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA5 to determine beneficial use support


DECISION ID	157604	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Fenthion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157604, Fenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

110275

Pollutant:

Fenthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenthion is the USEPA Aquatic Life Benchmark of 0.013 ug/L for and results are as follows: 0 of 0 samples exceed the criterion for Glyphosate, Total. Two sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for glyphosate is 700 ug/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA5 was collected at 1 monitoring site [ Russian River at Alexander Valley Bridge - 114RR4234]

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116357

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Glyphosate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349820

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Glyphosate is the USEPA Aquatic Life Benchmark of 11900 ug/L for a vascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP). Temporal Representation: Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157604, Fenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157604, Fenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157604, Fenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

DECISION ID

157560

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Heptachlor
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

p" width="33%">LOE Subgroup:

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42330

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenthion is the USEPA Aquatic Life Benchmark of 0.013 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157604, Fenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

119012

Pollutant:

Fenthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenthion is the USEPA Aquatic Life Benchmark of 0.013 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program<"left" valign="top" colspan="2">Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101741

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Heptachlor.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect aquatic life in freshwater criterion continuous concentration (expressed as a 4-day average) is 0.0038 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114010

Pollutant:

Heptachlor

Line of Evidence (LOE) for Decision ID 157604, Fenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

118438

Pollutant:

Fenthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenthion is the USEPA Aquatic Life Benchmark of 0.013 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157604, Fenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

118436

Pollutant:

Fenthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect of human health from the consumption of water and organisms is 0.00021 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42431

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenthion is the USEPA Aquatic Life Benchmark of 0.013 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157604, Fenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108759

Pollutant:

Fenthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenthion is the USEPA Aquatic Life Benchmark of 0.013 ug/L for an invertebrate (chronic).

Guideline Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322527

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science guidelines (NAS 1972) establish a maximum Heptachlor concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157604, Fenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124113

Pollutant:

Fenthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenthion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157604, Fenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124124

Pollutant:

Fenthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenthion, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157604, Fenthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124123

Pollutant:

Fenthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenthion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

yle="background-color:#CCCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 157560, Heptachlor

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 110692 Pollutant: Heptachlor LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Heptachlor. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect of human health from the consumption of water and organisms is 0.00021 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114BS0310). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116377 Pollutant: Heptachlor LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Heptachlor. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect aquatic life in freshwater criterion continuous concentration (expressed as a 4-day average) is 0.0038 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 101640 Pollutant: Heptachlor LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Heptachlor. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect human health from consumption of organisms only is 0.00021 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114BS0310).

DECISION ID

158482

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Fluoride
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Commercial or recreational collection of fish, shellfish, or organisms

Line of Evidence (LOE) for Decision ID 158482, Fluoride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328355

Pollutant:

Fluoride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations valign="top" width="33%">Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42409

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111827

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158482, Fluoride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328346

Pollutant:

Fluoride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Primary Maximum Contaminant Level (MCL) for Fluoride, is 2 mg/l.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158482, Fluoride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect human health from consumption of organisms only is 0.00021 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42355

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322528

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

r> LOE ID: 328364 Pollutant: Fluoride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Fluoride. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15, Division 4, Article 4, Section 64435 (Tables 2 and 3), and Section 64444.5 (Table 5), and listed in Table 3-2 of this Plan. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The California Primary Maximum Contaminant Level (MCL) for Fluoride, is 2 mg/l. Guideline Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158482, Fluoride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328354 Pollutant: Fluoride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Agricultural Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Fluoride. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A 1 mg/L criteria is the recommended maximum concentration of Fluoride in irrigation water. Guideline Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158482, Fluoride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328343 Pollutant: Fluoride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Agricultural Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Fluoride. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A 1 mg/L criteria is the recommended maximum concentration of Fluoride in irrigation water. Guideline Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158482, Fluoride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 120893 Pollutant: Fluoride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed NWIS data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Fluoride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15, Division 4, Article 4, Section 64435 (Tables 2 and 3), and Section 64444.5 (Table 5), and listed in Table 3-2 of this Plan. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The California Primary Maximum Contaminant Level (MCL) for Fluoride, is 2 mg/l. Guideline Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) Spatial Representation: The samples were collected at 1 monitoring site(s) (USGS-11463980) Temporal Representation: The samples were collected between the dates of 2011-07-28 and 2011-07-28 Environmental Conditions: QAPP Information: QAPP not required for federal data QAPP Information Reference(s): This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 158482, Fluoride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 120805 Pollutant: Fluoride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Agricultural Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed NWIS data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Fluoride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A 1 mg/L criteria is the recommended maximum concentration of Fluoride in irrigation water. Guideline Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) Spatial Representation: The samples were collected at 1 monitoring site(s) (USGS-11463980) Temporal Representation: The samples were collected between the dates of 2011-07-28 and 2011-07-28 Environmental Conditions: QAPP Information: QAPP not required for federal data QAPP Information Reference(s): This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 158482, Fluoride	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328362 Pollutant: Fluoride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Fluoride. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15, Division 4, Article 4, Section 64435 (Tables 2 and 3), and Section 64444.5 (Table 5), and listed in Table 3-2 of this Plan. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The California Primary Maximum Contaminant Level (MCL) for Fluoride, is 2 mg/l. Guideline Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle


DECISION ID	157561	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Heptachlor epoxide
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101740

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Heptachlor Epoxide.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect aquatic life in freshwater criterion continuous concentration (expressed as a 4-day average) is 0.0038 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123959

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Heptachlor Epoxide, Total. Ten sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	157558	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Glyphosate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 41863 has been replaced by LOE 349820 and LOE 41908 has been replaced by LOE 349814 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349814

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Glyphosate is the USEPA Aquatic Life Benchmark of 11900 ug/L for a vascular plant (acute).

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42282

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116374

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Heptachlor Epoxide.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123946

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Glyphosate, Total. Five sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for glyphosate is 700 ug/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 10/23/2002-6/19/2003.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157558, Glyphosate

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect aquatic life in freshwater criterion continuous concentration (expressed as a 4-day average) is 0.0038 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42165

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324953

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Glyphosate.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-02-07

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324969

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Glyphosate.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

All watersleft" valign="top" width="33%">QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123958

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Heptachlor Epoxide, Total. Forty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120157

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Glyphosate is the USEPA Aquatic Life Benchmark of 11900 ug/L for a vascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-02-07

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324956

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Glyphosate.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Glyphosate is the USEPA Aquatic Life Benchmark of 11900 ug/L for a vascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2017-02-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157558, Glyphosate

Region 1

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect human health from consumption of organisms only is 0.00011 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105974

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

pan="2">

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324962

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Glyphosate.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Glyphosate is the USEPA Aquatic Life Benchmark of 11900 ug/L for a vascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-02-07

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324951

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Glyphosate.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as dom

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect human health from consumption of organisms only is 0.00011 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42235

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2017-02-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324968

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Glyphosate.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Glyphosate is the USEPA Aquatic Life Benchmark of 11900 ug/L for a vascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2017-02-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Mi00%" cellspacing="0" cellpadding="0">
Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322557

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science guidelines (NAS 1972) establish a maximum Heptachlor Epoxide concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322559

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

LOE ID:

41882

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for glyphosate is 700 ug/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116355

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Glyphosate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of 0 samples exceeded the water quality threshold for Heptachlor Epoxide. Monitors collected 3 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish, 1 composite of Sacramento Sucker composed of 10 fish, and 1 composite of Smallmouth Bass composed of 6 fish. Because no composites were collected within the same averaging period, these composites represent 3 independent samples. These samples were not used in the assessment because the laboratory data reporting limits were above the objectives and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The modified OEHHA Fish Contaminant Goal for heptachlor epoxide in fish tissue is 0.93 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008; OEHHA, 1999)

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Guideline Reference:

Public Health Goal for Heptachlor and Heptachlor Epoxide in Drinking Water

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from themdl/records/region_1/2018/ref4527.pdf" >Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322563

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Evaluation Guideline:

The evaluation guideline for Glyphosate is the USEPA Aquatic Life Benchmark of 11900 ug/L for a vascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123947

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Glyphosate, Total. Five sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for glyphosate is 700 ug/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 10/23/2002-6/19/2003.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient M Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

107581

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect of human health from the consumption of water and organisms is 0.00010 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116358

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Glyphosate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Glyphosate is the USEPA Aquatic Life Benchmark of 11900 ug/L for a vascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124125

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA5 to determine beneficial use support67%">

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123948

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Heptachlor Epoxide, Total. Forty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42184

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

118197

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect of human health from the consumption of water and organisms is 0.00010 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

and results are as follows: 0 of 0 samples exceed the criterion for Glyphosate, Total. Two sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for glyphosate is 700 ug/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA5 was collected at 1 monitoring site [ Russian River at Alexander Valley Bridge - 114RR4234] Temporal Representation: Data was collected over the time period 6/21/2001-6/25/2001. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116357 Pollutant: Glyphosate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Glyphosate. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for glyphosate is 700 ug/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157558, Glyphosate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 349820 Pollutant: Glyphosate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Glyphosate. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Glyphosate is the USEPA Aquatic Life Benchmark of 11900 ug/L for a vascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2007-11-26 and 2008-07-14 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP


DECISION ID	157562	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Hexachlorobenzene/ HCB
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Nine lines of evidence are available in the administrative record to assess this pollutant. One of 39 samples exceed the Municipal & Domestic Supply beneficial use objective for the Not Recorded fraction of water. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of 39 samples exceed the Municipal & Domestic Supply beneficial use objective for the Not Recorded fraction of water and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157562, Hexachlorobenzene/ HCB	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

106089

Pollutant:

Hexachlorobenzene/ HCB

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for hexachlorobenzene to protect of human health from the consumption of water and organisms is 0.00075 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157562, Hexachlorobenzene/ HCB	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108631

Pollutant:

Hexachlorobenzene/ HCB

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for hexachlorobenzene to protect human health from consumption of organisms only is 0.00077 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157562, Hexachlorobenzene/ HCB	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322567

Pollutant:

Hexachlorobenzene/ HCB

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The modified OEHHA Fish Contaminant Goal for hexachlorobenzene in fish tissue is 2.8 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008; OEHHA, 2005)

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Guideline Reference:

Air Toxics Hotspots Program Risk Assessment Guidelines. Part ll Technical Support Document for Describing Available Cancer Potency Values.

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157562, Hexachlorobenzene/ HCB	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

46600

Pollutant:

Hexachlorobenzene/ HCB

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

All 26 of the non-detect and detect not quantified (DNQ) sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008). This LOE and LOE 46601 contain data originally evaluated in LOE 25640, which included data from a site that is not in this water body. The data from LOE 25640 have been split into two LOEs, with data now evaluated under the correct water body.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Per the National Recommended Water Quality Criteria (USEPA 2006): The recommended criterion for hexachlorobenzene for the protection of source waters for human health consumption of water and organisms is 0.00028 ug/l.

Guideline Reference:

Spatial Representation:

Samples were collected from the mainstem Russian River at 3 locations as follows: (1) at Cloverdale (SWAMP Station ID 114RRCLO1), (2) downstream of the Cloverdale Water Treatment Plant (SWAMP Station ID 114CLOSTP), and (3) at Alexandar Valley (SWAMP Station ID 114RRALEX). Samples were collected from well-mixed flows in glides or riffles.

Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157562, Hexachlorobenzene/ HCB	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42216

Pollutant:

Hexachlorobenzene/ HCB

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial


DECISION ID	157560	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Heptachlor
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42330

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157562, Hexachlorobenzene/ HCB	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

113763

Pollutant:

Hexachlorobenzene/ HCB

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for hexachlorobenzene to protect of human health from the consumption of water and organisms is 0.00075 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Water Quality Standards 2000. Establishment of numeric criteria for priori"left" valign="top" colspan="2">Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101741

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Heptachlor.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect aquatic life in freshwater criterion continuous concentration (expressed as a 4-day average) is 0.0038 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114010

Pollutant:

Heptachlor

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157562, Hexachlorobenzene/ HCB	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

25640

Pollutant:

Hexachlorobenzene/ HCB

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

One of the 39 hexachlorobenzene samples collected in the mainstem Russian River exceeds the evaluation guideline. Sample concentrations range from non-detect (with a reporting limit of 0.001 ug/l) to detected but not quantified with a concentration of at least 0.001 ug/l. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008).

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157562, Hexachlorobenzene/ HCB	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42242

Pollutant:

Hexachlorobenzene/ HCB

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157562, Hexachlorobenzene/ HCB	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

110314

Pollutant:

Hexachlorobenzene/ HCB

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for hexachlorobenzene to protect human health from consumption of organisms only is 0.00077 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

p" width="33%">LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect of human health from the consumption of water and organisms is 0.00021 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42431

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322527

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

110692

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect of human health from the consumption of water and organisms is 0.00021 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116377

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB


DECISION ID	167506	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Hexachlorocyclohexane (HCH), alpha
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Heptachlor.

Line of Evidence (LOE) for Decision ID 167506, Hexachlorocyclohexane (HCH), alpha	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41928

Pollutant:

Hexachlorocyclohexane (HCH), alpha

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167506, Hexachlorocyclohexane (HCH), alpha	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116359

Pollutant:

Hexachlorocyclohexane (HCH), alpha

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, alpha-.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-BHC to protect human health from consumption of organisms only is 0.013 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167506, Hexachlorocyclohexane (HCH), alpha	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116360

Pollutant:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect aquatic life in freshwater criterion continuous concentration (expressed as a 4-day average) is 0.0038 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101640

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect human health from consumption of organisms only is 0.00021 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42409

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111827

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Hexachlorocyclohexane (HCH), alpha

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, alpha-.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-BHC to protect of human health from the consumption of water and organisms is 0.0039 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167506, Hexachlorocyclohexane (HCH), alpha	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41954

Pollutant:

Hexachlorocyclohexane (HCH), alpha

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-BHC (HCH, alpha) to protect human health from consumption of organisms only is 0.013 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167506, Hexachlorocyclohexane (HCH), alpha	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116362

Pollutant:

Hexachlorocyclohexane (HCH), alpha

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, alpha-.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-BHC to protect of human health from the consumption of water and organisms is 0.0039 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167506, Hexachlorocyclohexane (HCH), alpha	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116361

Pollutant:

Hexachlorocyclohexane (HCH), alpha

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, alpha-.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-BHC to protect human health from consumption of organisms only is 0.013 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

"67%">Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect human health from consumption of organisms only is 0.00021 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42355

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157560, Heptachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322528

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):


DECISION ID	167507	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Hexachlorocyclohexane (HCH), beta
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167507, Hexachlorocyclohexane (HCH), beta	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41907

Pollutant:

Hexachlorocyclohexane (HCH), beta

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-BHC (HCH, beta) to protect human health from consumption of organisms only is 0.046 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

DECISION ID

157561

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Heptachlor epoxide
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101740

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Heptachlor Epoxide.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect aquatic life in freshwater criterion continuous concentration (expressed as a 4-day average) is 0.0038 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167507, Hexachlorocyclohexane (HCH), beta	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116365

Pollutant:

Hexachlorocyclohexane (HCH), beta

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, beta-.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-BHC to protect human health from consumption of organisms only is 0.046 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167507, Hexachlorocyclohexane (HCH), beta	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116363

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123959

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Heptachlor Epoxide, Total. Ten sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42282

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116374

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Heptachlor Epoxide.

Pollutant:

Hexachlorocyclohexane (HCH), beta

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, beta-.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-BHC to protect human health from consumption of organisms only is 0.046 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167507, Hexachlorocyclohexane (HCH), beta	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41966

Pollutant:

Hexachlorocyclohexane (HCH), beta

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167507, Hexachlorocyclohexane (HCH), beta	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116366

Pollutant:

Hexachlorocyclohexane (HCH), beta

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, beta-.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-BHC to protect of human health from the consumption of water and organisms is 0.014 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167507, Hexachlorocyclohexane (HCH), beta	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116364

Pollutant:

Hexachlorocyclohexane (HCH), beta

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, beta-.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-BHC to protect of human health from the consumption of water and organisms is 0.014 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

n="top" width="33%">Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect aquatic life in freshwater criterion continuous concentration (expressed as a 4-day average) is 0.0038 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 42165 Pollutant: Heptachlor epoxide LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect human health from consumption of organisms only is 0.00011 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed.

DECISION ID

157537

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Hydroxyatrazine, 2-
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157537, Hydroxyatrazine, 2-	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325057

Pollutant:

Hydroxyatrazine, 2-

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Hydroxyatrazine, 2-.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for hydroxyatrazine, 2- is the USEPA Aquatic Life Benchmark of 1,500 ug/L for a fish (acute) for triazine HA degradate.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157537, Hydroxyatrazine, 2-	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325060

Pollutant:

Hydroxyatrazine, 2-

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Hydroxyatrazine, 2-.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for hydroxyatrazine, 2- is the USEPA Aquatic Life Benchmark of 1,500 ug/L for a fish (acute) for triazine HA degradate.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

left" valign="top" width="33%">QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 123958 Pollutant: Heptachlor epoxide LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Heptachlor Epoxide, Total. Forty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect of human health from the consumption of water and organisms is 0.00021 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 120157 Pollutant: Heptachlor epoxide LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Heptachlor Epoxide. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect human health from consumption of organisms only is 0.00011 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114RR5652). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 105974 Pollutant: Heptachlor epoxide LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Heptachlor Epoxide. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .


DECISION ID	157563	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Iron
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157563, Iron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120865

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Red Book states that based on field observations principally, a criterion of 1.0 mg/L iron for freshwater aquatic life is believed to be adequately protective.

Guideli

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect human health from consumption of organisms only is 0.00011 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42235

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Quality Criteria for Water. USEPA Office of Water and Hazardous Materials. Washington, D.C

Spatial Representation:

The samples were collected at 1 monitoring site(s) (USGS-11463980)

Temporal Representation:

The samples were collected between the dates of 2011-07-28 and 2011-07-28

Environmental Conditions:

QAPP Information:

QAPP not required for federal data

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 157563, Iron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120915

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin: Waters designated for MUN shall not contain concentrations of chemical constituents in excess of the MCL specified in Title 22 of the California Code of Regulations. The secondary maximum contaminant level listed in Table 64449-A for Iron is 0.3 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (USGS-11463980)

Temporal Representation:

The samples were collected between the dates of 2011-07-28 and 2011-07-28

Environmental Conditions:

QAPP Information:

QAPP not required for federal data

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 157563, Iron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325100

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction00%" cellspacing="0" cellpadding="0">

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322557

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322559

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of 0 samples exceeded the water quality threshold for Heptachlor Epoxide. Monitors collected 3 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish, 1 composite of Sacramento Sucker composed of 10 fish, and 1 composite of Smallmouth Bass composed of 6 fish. Because no composites were collected within the same averaging period, these composites represent 3 independent samples. These samples were not used in the assessment because the laboratory data reporting limits were above the objectives and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Guideline Reference:

Public Health Goal for Heptachlor and Heptachlor Epoxide in Drinking Water

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the:

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322563

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Iron.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Red Book states that based on field observations principally, a criterion of 1.0 mg/L iron for freshwater aquatic life is believed to be adequately protective.

Guideline Reference:

Quality Criteria for Water. USEPA Office of Water and Hazardous Materials. Washington, D.C

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157563, Iron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325087

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Iron.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations are intended protect aquatic organisms from chronic exposures (expressed as 4-day average concentration) in freshwater. The evaluation guideline for iron is 1,000 ug/L to protect warm freshwater habitat.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157563, Iron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325094

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Iron.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157563, Iron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328429

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

107581

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect of human health from the consumption of water and organisms is 0.00010 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123948

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Heptachlor Epoxide, Total. Forty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42184

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157561, Heptachlor epoxide	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

118197

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect of human health from the consumption of water and organisms is 0.00010 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

">Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Iron. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin: Waters designated for MUN shall not contain concentrations of chemical constituents in excess of the MCL specified in Title 22 of the California Code of Regulations. The secondary maximum contaminant level listed in Table 64449-A for Iron is 0.3 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2017-06-11 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157563, Iron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328450 Pollutant: Iron LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Iron. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: National Recommended Water Quality Criteria Continuous Concentrations are intended protect aquatic organisms from chronic exposures (expressed as 4-day average concentration) in freshwater. The evaluation guideline for iron is 1,000 ug/L to protect warm freshwater habitat. Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2017-06-11 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157563, Iron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328434 Pollutant: Iron LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Iron. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The Red Book states that based on field observations principally, a criterion of 1.0 mg/L iron for freshwater aquatic life is believed to be adequately protective. Guideline Reference: Quality Criteria for Water. USEPA Office of Water and Hazardous Materials. Washington, D.C Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2017-06-11 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157563, Iron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328433 Pollutant: Iron LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissol


DECISION ID	157562	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Hexachlorobenzene/ HCB
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Nine lines of evidence are available in the administrative record to assess this pollutant. One of 39 samples exceed the Municipal & Domestic Supply beneficial use objective for the Not Recorded fraction of water. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of 39 samples exceed the Municipal & Domestic Supply beneficial use objective for the Not Recorded fraction of water and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157562, Hexachlorobenzene/ HCB	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

106089

Pollutant:

Hexachlorobenzene/ HCB

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Datved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157563, Iron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328449

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Red Book states that based on field observations principally, a criterion of 1.0 mg/L iron for freshwater aquatic life is believed to be adequately protective.

Guideline Reference:

Quality Criteria for Water. USEPA Office of Water and Hazardous Materials. Washington, D.C

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157563, Iron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328424

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

a: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for hexachlorobenzene to protect of human health from the consumption of water and organisms is 0.00075 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114BS0310). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157562, Hexachlorobenzene/ HCB	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108631 Pollutant: Hexachlorobenzene/ HCB LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Hexachlorobenzene. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for hexachlorobenzene to protect human health from consumption of organisms only is 0.00077 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114BS0310). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157562, Hexachlorobenzene/ HCB	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 322567 Pollutant: Hexachlorobenzene/ HCB LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of 3 samples exceeded the water quality threshold for Hexachlorobenzene. Monitors collected 3 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish, 1 composite of Sacramento Sucker composed of 10 fish, and 1 composite of Smallmouth Bass composed of 6 fish. Because no composites were collected within the same averaging period, these composites represent 3 independent samples. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The modified OEHHA Fish Contaminant Goal for hexachlorobenzene in fish tissue is 2.8 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008; OEHHA, 2005) Guideline Reference: Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene Guideline Reference: Air Toxics Hotspots Program Risk Assessment Guidelines. Part ll Technical Support Document for Describing Available Cancer Potency Values. Spatial Representation: Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP). Temporal Representation: Data for this line of evidence were collected between 2015-08-03 and 2015-08-03. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes. Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157562, Hexachlorobenzene/ HCB	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID


DECISION ID	157619	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Jasmolin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 116379 has been replaced by LOE 349883 and LOE 116380 has been replaced by LOE 349864 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157619, Jasmolin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349864

Pollutant:

Jasmolin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Jasmolin.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for jasmolin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of jasmolin-1 and jasmolin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157619, Jasmolin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325111

Pollutant:

Jasmolin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Jasmolin.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for jasmolin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of jasmolin-1 and jasmolin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157619, Jasmolin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325112

Pollutant:

Jasmolin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Jasmolin.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for jasmolin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of jasmolin-1 and jasmolin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157619, Jasmolin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349883

Pollutant:

Jasmolin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Jasmolin.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for jasmolin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of jasmolin-1 and jasmolin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

: 46600 Pollutant: Hexachlorobenzene/ HCB LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: All 26 of the non-detect and detect not quantified (DNQ) sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008). This LOE and LOE 46601 contain data originally evaluated in LOE 25640, which included data from a site that is not in this water body. The data from LOE 25640 have been split into two LOEs, with data now evaluated under the correct water body. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1) Evaluation Guideline: Per the National Recommended Water Quality Criteria (USEPA 2006): The recommended criterion for hexachlorobenzene for the protection of source waters for human health consumption of water and organisms is 0.00028 ug/l. Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology Spatial Representation: Samples were collected from the mainstem Russian River at 3 locations as follows: (1) at Cloverdale (SWAMP Station ID 114RRCLO1), (2) downstream of the Cloverdale Water Treatment Plant (SWAMP Station ID 114CLOSTP), and (3) at Alexandar Valley (SWAMP Station ID 114RRALEX). Samples were collected from well-mixed flows in glides or riffles. Temporal Representation: At the Alexander Valley Bridge site, samples were collected over 2 site visits at each site during June 2001. At the Cloverdale site samples were collected over 19 site visits from June 2001 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157562, Hexachlorobenzene/ HCB	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 42216 Pollutant: Hexachlorobenzene/ HCB LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for hexachlorobenzene to protect of human health from the consumption of water and organisms is 0.00075 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157562, Hexachlorobenzene/ HCB	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 113763 Pollutant: Hexachlorobenzene/ HCB LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Hexachlorobenzene. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for hexachlorobenzene to protect of human health from the consumption of water and organisms is 0.00075 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114RR5652). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157562, Hexachlorobenzene/ HCB	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 25640 Pollutant: Hexachlorobenzene/ HCB LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Not Recorded Beneficial Use: Municipal & Domestic Supply Number of Samples: 39 Number of Exceedances: 1 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: One of the 39 hexachlorobenzene samples collected in the mainstem Russian River exceeds the evaluation guideline. Sample concentrations range from non-detect (with a reporting limit of 0.001 ug/l) to detected but not quantified with a concentration of at least 0.001 ug/l. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008). Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1) Evaluation Guideline: Per the National Recommended Water Quality Criteria (USEPA 2006): The recommended criterion for hexachlorobenzene for the protection of source waters for human health consumption of water and organisms is 0.00028 ug/l. Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology Spatial Representation: Samples were collected from the mainstem Russian River at 3 locations as follows: (1) at Cloverdale (SWAMP Station ID 114RRCLO1), (2) downstream of the Cloverdale Water Treatment Plant (SWAMP Station ID 114CLOSTP), and (3) at Healdsburg Memorial Beach (SWAMP Station ID 114RRHMB1). Samples were collected from well-mixed flows in glides or riffles. Temporal Representation: At the Alexander Valley Bridge site, samples were collected over 2 site visits at each site during June 2001. At the Cloverdale and Healdsburg Memorial Beach sites, samples were collected over 22 site visits at each site from June 2001 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157562, Hexachlorobenzene/ HCB	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 42242 Pollutant: Hexachlorobenzene/ HCB LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for hexachlorobenzene to protect human health from consumption of organisms only is 0.00077 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157562, Hexachlorobenzene/ HCB	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 110314 Pollutant: Hexachlorobenzene/ HCB LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Hexachlorobenzene. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for hexachlorobenzene to protect human health from consumption of organisms only is 0.00077 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114RR5652). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	157564	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Lead
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Twenty-two lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceed the objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116381

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Lead.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325182

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Lead.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for MUN shall not contain concentrations of chemical constituents in excess of values listed in Table 3-2 of the Basin Plan. The value for lead is 15 ug/L (California Code of Regulations, Title 22)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116382

DECISION ID

167506

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Hexachlorocyclohexane (HCH), alpha
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167506, Hexachlorocyclohexane (HCH), alpha	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41928

Pollutant:

Hexachlorocyclohexane (HCH), alpha

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116384

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116385

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123961

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167506, Hexachlorocyclohexane (HCH), alpha	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116359

Pollutant:

Hexachlorocyclohexane (HCH), alpha

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, alpha-.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-BHC to protect human health from consumption of organisms only is 0.013 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167506, Hexachlorocyclohexane (HCH), alpha	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116360

Pollutant:

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: Two sample results were not used in this assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for MUN shall not contain concentrations of chemical constituents in excess of values listed in Table 3-2 of the Basin Plan. The value for lead is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Comminski Station - 114RRCOMM]

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123960

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Lead, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Wat

Hexachlorocyclohexane (HCH), alpha

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, alpha-.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-BHC to protect of human health from the consumption of water and organisms is 0.0039 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167506, Hexachlorocyclohexane (HCH), alpha	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41954

Pollutant:

Hexachlorocyclohexane (HCH), alpha

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-BHC (HCH, alpha) to protect human health from consumption of organisms only is 0.013 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167506, Hexachlorocyclohexane (HCH), alpha	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116362

Pollutant:

Hexachlorocyclohexane (HCH), alpha

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, alpha-.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-BHC to protect of human health from the consumption of water and organisms is 0.0039 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167506, Hexachlorocyclohexane (HCH), alpha	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116361

Pollutant:

Hexachlorocyclohexane (HCH), alpha

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, alpha-.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-BHC to protect human health from consumption of organisms only is 0.013 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

er Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for MUN shall not contain concentrations of chemical constituents in excess of values listed in Table 3-2 of the Basin Plan. The value for lead is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 123971 Pollutant: Lead LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 21 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 21 samples exceed the criterion for Lead, Total. Two sample results were not used in this assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for MUN shall not contain concentrations of chemical constituents in excess of values listed in Table 3-2 of the Basin Plan. The value for lead is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 6/21/2001-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116386 Pollutant: Lead LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Lead. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for MUN shall not contain concentrations of chemical constituents in excess of values listed in Table 3-2 of the Basin Plan. The value for lead is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-09-28 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 123972 Pollutant: Lead LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 21 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 21 samples exceed the criterion for Lead, Total. Two sample results were not used in this assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the


DECISION ID	167507	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Hexachlorocyclohexane (HCH), beta
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167507, Hexachlorocyclohexane (HCH), beta	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41907

Pollutant:

Hexachlorocyclohexane (HCH), beta

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-BHC (HCH, beta) to protect human health from consumption of organisms only is 0.046 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167507, Hexachlorocyclohexane (HCH), beta	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116365

Pollutant:

Hexachlorocyclohexane (HCH), beta

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, beta-.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-BHC to protect human health from consumption of organisms only is 0.046 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167507, Hexachlorocyclohexane (HCH), beta	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116363

Pollutant:

Hexachlorocyclohexane (HCH), beta

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, beta-.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-BHC to protect human health from consumption of organisms only is 0.046 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167507, Hexachlorocyclohexane (HCH), beta	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41966

Pollutant:

Hexachlorocyclohexane (HCH), beta

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167507, Hexachlorocyclohexane (HCH), beta	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116366

Pollutant:

Hexachlorocyclohexane (HCH), beta

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, beta-.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-BHC to protect of human health from the consumption of water and organisms is 0.014 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167507, Hexachlorocyclohexane (HCH), beta	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116364

Pollutant:

Hexachlorocyclohexane (HCH), beta

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, beta-.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-BHC to protect of human health from the consumption of water and organisms is 0.014 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Listing Policy. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for MUN shall not contain concentrations of chemical constituents in excess of values listed in Table 3-2 of the Basin Plan. The value for lead is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 6/22/2001-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325167 Pollutant: Lead LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Lead. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The dissolved lead criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.5 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Informa


DECISION ID	157537	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Hydroxyatrazine, 2-
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157537, Hydroxyatrazine, 2-	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325057

Pollutant:

Hydroxyatrazine, 2-

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Hydroxyatrazine, 2-.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for hydroxyatrazine, 2- is the USEPA Aquatic Life Benchmark of 1,500 ug/L for a fish (acute) for triazine HA degradate.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157537, Hydroxyatrazine, 2-	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325060

Pollutant:

Hydroxyatrazine, 2-

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Hydroxyatrazine, 2-.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for hydroxyatrazine, 2- is the USEPA Aquatic Life Benchmark of 1,500 ug/L for a fish (acute) for triazine HA degradate.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

tion: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325164 Pollutant: Lead LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Lead. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The dissolved lead criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.5 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325176 Pollutant: Lead LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Lead. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The dissolved lead criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.5 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325163 Pollutant: Lead LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Lead. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for MUN shall not contain concentrations of chemical constituents in excess of values listed in Table 3-2 of the Basin Plan. The value for lead is 15 ug/L (California Code of Regulations, Title 22) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP



DECISION ID	157563	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Iron
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157563, Iron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120865

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Red Book states that based on field observations principally, a criterion of 1.0 mg/L iron for freshwater aquatic life is believed to be adequately protective.

Guideline Reference:

Quality Criteria for Water. USEPA Office of Water and Hazardous Materials. Washington, D.C

Spatial Representation:

The samples were collected at 1 monitoring site(s) (USGS-11463980)

Temporal Representation:

The samples were collected between the dates of 2011-07-28 and 2011-07-28

Environmental Conditions:

QAPP Information:

QAPP not required for federal data

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 157563, Iron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120915

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (USGS-11463980)

Temporal Representation:

The samples were collected between the dates of 2011-07-28 and 2011-07-28

Environmental Conditions:

QAPP Information:

QAPP not required for federal data

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 157563, Iron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325100

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fractione="background-color:#CCCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 157564, Lead

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325186 Pollutant: Lead LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Lead. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for MUN shall not contain concentrations of chemical constituents in excess of values listed in Table 3-2 of the Basin Plan. The value for lead is 15 ug/L (California Code of Regulations, Title 22) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116383 Pollutant: Lead LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Lead. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-09-28 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325159 Pollutant: Lead LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Lead. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for MUN shall not contain concentrations of chemical constituents in excess of values listed in Table 3-2 of the Basin Plan. The value for lead is 15 ug/L (California Code of Regulations, Title 22) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157564, Lead

Region 1

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Iron.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Red Book states that based on field observations principally, a criterion of 1.0 mg/L iron for freshwater aquatic life is believed to be adequately protective.

Guideline Reference:

Quality Criteria for Water. USEPA Office of Water and Hazardous Materials. Washington, D.C

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157563, Iron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325087

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Iron.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157563, Iron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325094

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Iron.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157563, Iron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328429

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325170 Pollutant: Lead LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Lead. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The dissolved lead criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.5 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 42624 Pollutant: Lead LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Lead. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for MUN shall not contain concentrations of chemical constituents in excess of values listed in Table 3-2 of the Basin Plan. The value for lead is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 33203 Pollutant: Lead LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: None of the 4 samples exceeded the hardness based criteria calculated for lead. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Samples collected at station 114RR5652 (Russian River at Crocker Road). Temporal Representation: Samples collected between 11/26/2007 and 7/14/2008. Environmental Conditions: QAPP Information: SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 43748 Pollutant: Lead LOE Subgroup: Pollutant-Sediment Matrix: Sediment Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Lead. Data Reference: Statewide Stream Pollution Trends Study 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for lead is 128 mg/Kg dry weight (MacDonald et al. 2000). Guideline Reference: Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ] Temporal Representation: Data was collected on a single day 10/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 43747 Pollutant: Lead LOE Subgroup: Pollutant-Sediment Matrix: Sediment Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Lead. Data Reference: Statewide Stream Pollution Trends Study 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for lead is 128 mg/Kg dry weight (MacDonald et al. 2000). Guideline Reference: Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ] Temporal Representation: Data was collected on a single day 10/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan ">Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Iron. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin: Waters designated for MUN shall not contain concentrations of chemical constituents in excess of the MCL specified in Title 22 of the California Code of Regulations. The secondary maximum contaminant level listed in Table 64449-A for Iron is 0.3 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2017-06-11 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157563, Iron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157563, Iron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157563, Iron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328433 Pollutant: Iron LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissol


DECISION ID	167508	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Leptophos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167508, Leptophos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123973

Pollutant:

Leptophos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Leptophos, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157563, Iron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328449

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Red Book states that based on field observations principally, a criterion of 1.0 mg/L iron for freshwater aquatic life is believed to be adequately protective.

Guideline Reference:

Quality Criteria for Water. USEPA Office of Water and Hazardous Materials. Washington, D.C

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157563, Iron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328424

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

ction 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167508, Leptophos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 123985 Pollutant: Leptophos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Leptophos, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167508, Leptophos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 123974 Pollutant: Leptophos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Leptophos, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	157565	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101738

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, gamma-.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for gamma-BHC (Lindane, gamma-HCH) to protect of human health from the consumption of water and organisms is 0.019 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Regist


DECISION ID	157619	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Jasmolin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 116379 has been replaced by LOE 349883 and LOE 116380 has been replaced by LOE 349864 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157619, Jasmolin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Jasmolin.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

The evaluation guideline for jasmolin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates er Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency

The samples were collected at 1 monitoring site(s) (114RR5652)

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

116372

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, gamma-.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for gamma-BHC (Lindane, gamma-HCH) to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.95 ug/L (California Toxics Rule, 2000).

The samples were collected at 1 monitoring site(s) (114RR5652)

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Line of Evidence (LOE) for Decision ID 157619, Jasmolin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Jasmolin.

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Water Quality Control Plan (Basin Plan) for the North Coast Region

The evaluation guideline for jasmolin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of jasmolin-1 and jasmolin-2.

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

The samples were collected between the dates of 2014-02-03 and 2014-02-03

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

Line of Evidence (LOE) for Decision ID 157619, Jasmolin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Jasmolin.

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Water Quality Control Plan (Basin Plan) for the North Coast Region

The evaluation guideline for jasmolin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of jasmolin-1 and jasmolin-2.

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

The samples were collected between the dates of 2014-02-03 and 2014-02-03

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

Line of Evidence (LOE) for Decision ID 157619, Jasmolin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Jasmolin.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

The evaluation guideline for jasmolin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of jasmolin-1 and jasmolin-2.

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

The samples were collected between the dates of 2014-02-03 and 2014-02-03

lign="left" valign="top" width="33%">LOE ID:

101734

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, gamma-.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for gamma-BHC (Lindane, gamma-HCH) to protect of human health from the consumption of water and organisms is 0.019 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43684

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

DECISION ID

157564

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Lead
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Twenty-two lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceed the objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

rds.ca.gov/water_issues/programs/tmdl/records/state_board/2017/ref4461.zip" >Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116381

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Lead.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for Lindane (gamma-HCH) is 4.99 ug/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42383

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Heiterion.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325182

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Lead.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116382

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42437

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116369

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, gamma-.

Data Reference:

Water Quality Assessment Data for the 2018 solft" valign="top" width="33%">Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116384

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Sticitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for gamma-BHC (Lindane, gamma-HCH) to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.95 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116368

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, gamma-.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for gamma-BHC (Lindane, gamma-HCH) to protect human health from consumption of organisms only is 0.063 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116385

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123961

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43683

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for Lindane (gamma-HCH) is 4.99 ug/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42444

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Comminski Station - 114RRCOMM]

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123960

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Lead, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Wat

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42358

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123971

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 21 samples exceed the criterion for Lead, Total. Two sample results were not used in this assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/21/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambienlign="left" valign="top" width="67%">Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322497

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science guidelines (NAS 1972) establish a maximum Lindane concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322507

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116386

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Lead.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123972

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The modified OEHHA Fish Contaminant Goal for lindane in fish tissue is 4.6 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008; OEHHA, 2005)

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Guideline Reference:

Air Toxics Hotspots Program Risk Assessment Guidelines. Part ll Technical Support Document for Describing Available Cancer Potency Values.

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322508

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101736

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, gamma-.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for gamma-BHC (Lindane, gamma-HCH) to protect human health from consumption of organisms only is 0.063 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA


DECISION ID	157566	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Linuron
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157566, Linuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325194

Pollutant:

Linuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Linuron.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Based on USEPA IRIS reference dose (RfD) as a drinking water level, the drinking water health advisory level for linuron is 1.4 ug/L.

Guideline Reference:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325164

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Lead.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The dissolved lead criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325176

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Rusgn="top" width="67%">IRIS Reference Summary (Various Pollutants)

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157566, Linuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325188

Pollutant:

Linuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Linuron.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for linuron is the USEPA Aquatic Life Benchmark of 0.09 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157566, Linuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116387

Pollutant:

Linuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325163

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Lead.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Linuron.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Linuron is the USEPA Aquatic Life Benchmark of 0.09 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157566, Linuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116390

Pollutant:

Linuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Linuron.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Linuron is the USEPA Aquatic Life Benchmark of 0.09 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157566, Linuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116388

Pollutant:

Linuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Linuron.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Based on USEPA IRIS reference dose (RfD) as a drinking water level, the drinking water health advisory level for linuron is 1.4 µg/L.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157566, Linuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325192

Pollutant:

Linuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Linuron.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for linuron is the USEPA Aquatic Life Benchmark of 0.09 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

e="background-color:#CCCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 157564, Lead

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1


DECISION ID	157567	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Malathion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 42706 has been replaced by LOE 349976 and LOE 42769 has been replaced by LOE 349981 due to a reassessment of data using the UC Davis Aquatic Life Criterion threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157567, Malathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349976

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Malathion. Although a total of 3 samples were collected, 3 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

&colspan="2">

Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 42624 Pollutant: Lead LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Lead. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for MUN shall not contain concentrations of chemical constituents in excess of values listed in Table 3-2 of the Basin Plan. The value for lead is 0.05 mg/L. Objective/Criterion Reference: Evaluation Guideline: Aquatic life should not be affected unacceptably if the 4-day average concentration of Malathion, does not exceed 0.028 ug/L more than once every three years on the average (UC Davis Aquatic Life Criterion). Guideline Reference: Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48. Spatial Representation: The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2007-11-26 and 2008-07-14 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157567, Malathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 349981 Pollutant: Malathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Malathion. Although a total of 3 samples were collected, 3 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Aquatic life should not be affected unacceptably if the 4-day average concentration of Malathion, does not exceed 0.028 ug/L more than once every three years on the average (UC Davis Aquatic Life Criterion). Guideline Reference: Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48. Spatial Representation: The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2007-11-26 and 2008-07-14 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157567, Malathion

Region 1 >

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33203

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for lead.

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples collected between 11/26/2007 and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43748

Pollutant:

Lead

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for lead is 128 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157564, Lead	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43747

Pollutant:

Lead

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for lead is 128 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

;

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325207 Pollutant: Malathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Malathion. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Aquatic life should not be affected unacceptably if the 4-day average concentration of Malathion, does not exceed 0.028 ug/L more than once every three years on the average (UC Davis Aquatic Life Criterion). Guideline Reference: Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48. Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157567, Malathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325212 Pollutant: Malathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Malathion. Data Reference:

DECISION ID

167508

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Leptophos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167508, Leptophos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123973

Pollutant:

Leptophos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Leptophos, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Se/2022/ref5888.xlsx">Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water health advisory for malathion is 500 ug/L.

Guideline Reference:

2018 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157567, Malathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325211

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Aquatic life should not be affected unacceptably if the 4-day average concentration of Malathion, does not exceed 0.028 ug/L more than once every three years on the average (UC Davis Aquatic Life Criterion).

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAction 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167508, Leptophos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123985

Pollutant:

Leptophos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Leptophos, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167508, Leptophos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123974

Pollutant:

Leptophos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Leptophos, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

PP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157567, Malathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108692 Pollutant: Malathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Malathion. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Aquatic life should not be affected unacceptably if the 4-day average concentration of Malathion, does not exceed 0.028 ug/L more than once every three years on the average (UC Davis Aquatic Life Criterion). Guideline Reference: Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48. Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP). Temporal Representation: Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157567, Malathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108690 Pollutant: Malathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Malathion. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Aquatic life should not be affected unacceptably if the 4-day average concentration of Malathion, does not exceed 0.028 ug/L more than once every three years on the average (UC Davis Aquatic Life Criterion). Guideline Reference: Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48. Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114BS0310). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157567, Malathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108694 Pollutant: Malathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Malathion. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference:

DECISION ID

157565

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101738

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, gamma-.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for gamma-BHC (Lindane, gamma-HCH) to protect of human health from the consumption of water and organisms is 0.019 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Registdf" >Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157567, Malathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108691

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157567, Malathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111038

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157567, Malathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111034

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

er Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116372 Pollutant: Lindane/gamma Hexachlorocyclohexane (gamma-HCH) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, gamma-. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for gamma-BHC (Lindane, gamma-HCH) to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.95 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

DECISION ID

169057

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Regional Board Decision Recommendation:

Pollutant:

Mercury

Final Listing Decision:

Do Not List on 303(d) list (TMDL required list)

Last Listing Cycle's Final Listing Decision:

Do Not List on 303(d) list (TMDL required list)(2018)

Revision Status

Revised

Impairment from Pollutant or Pollution:

Pollutant

Regional Board Conclusion:

This pollutant is being considered for placement on the section 303(d) list under section 3.11 of the Listing Policy. Under section 3.11 when all other listing factors do not result in the listing of a water segment but information indicates non-attainment of standards, a water segment shall be evaluated to determine whether the weight of evidence demonstrates that water quality standard is not attained. If the weight of evidence indicates non-attainment, the water segment shall be placed on the CWA section 303(d) List. Thirty-nine lines of evidence are available in the administrative record to assess the pollutant.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. *RUSSIAN RIVER for the COMM beneficial use has one LOE (322573) and 1 of 1 sample exceeds the objective and consist of 32 trophic level 4 fish (CDFW legal limit). Fish used in the COMM assessment are limited to lengths that are within Calif. Dept. of Fish and Wildlife legal size limits applicable to this waterbody. *RUSSIAN RIVER for the WILD beneficial use has two LOES (322588, 322678) and 2 of 2 samples exceed the objective; however these are for samples collected on the same day. LOE 322588 is for the Sport fish objective and 1 of 1 samples exceed the mercury objective and consist of 32 trophic level 4 fish. (CDFW legal limit). LOE 322678 is for the Prey fish objective and 1 of 1 samples exceed the mercury objective and consist of 60 50-150mm prey fish.

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. 1 of 1 sample exceeds the objective for the WILD beneficial use. 1 of 1 sample exceeds the objective for the COMM beneficial use. The exceeding tissue samples for WILD and COMM are for trophic level 4 fish (CDFW legal size limit) that are annual averages and are aggregated from at least eight fish. Eight or more fish within a sample are needed to determine non-attainment of the mercury objective following weight of evidence in Listing Policy section 3.11.
4. Tissue samples were compared with the prey fish objective and 1 of 1 samples exceed WILD beneficial use. The exceeding sample, which may contain a mix of trophic levels, is aggregated from at least eight fish and this meets the one exceeding sample of eight or more fish needed to determine non-attainment of the mercury objective following weight of evidence in Listing Policy section 3.11.
5. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

***For the SEDIMENT MATRIX:
*RUSSIAN RIVER for the COLD beneficial use has one LOE (122303) and 0 of 1 sample exceeds the objective.
*RUSSIAN RIVER for the WARM beneficial use has two LOEs (43648, 121942) and 0 of 2 samples exceed the objective.

***For the TISSUE MATRIX:
*RUSSIAN RIVER for the COMM beneficial use has one LOE (322573) and 1 of 1 sample exceeds the objective and consist of 32 trophic level 4 fish (CDFW legal limit). Fish used in the COMM assessment are limited to lengths that are within Calif. Dept. of Fish and Wildlife legal size limits applicable to this waterbody.
*RUSSIAN RIVER for the WILD beneficial use has two LOES (322588, 322678) and 2 of 2 samples exceed the objective; however, the samples were collected on the same day. LOE 322588 is for the Sport fish objective and 1 of 1 samples exceed the mercury objective and consist of 32 trophic level 4 fish. (CDFW legal limit). LOE 322678 is for the Prey fish objective and 1 of 1 samples exceed the mercury objective and consist of 60 50-150mm prey fish.

***For the DISSOLVED FRACTION of the WATER MATRIX:
*MAACAMA CREEK for the COLD beneficial use has one LOE (328504) and 0 of 3 samples exceed the objective.
*MAACAMA CREEK for the COMM beneficial use has one LOE (328482) and 0 of 3 samples exceed the objective.
*MAACAMA CREEK for the MUN beneficial use has one LOE (328499) and 0 of 3 samples exceed the objective.
*MAACAMA CREEK for the WARM beneficial use has one LOE (328514) and 0 of 3 samples exceed the objective.

***For the TOTAL FRACTION of the WATER MATRIX:
*BIG SULPHUR CREEK for the COLD beneficial use has three LOEs (116394, 325289, 325378) and 0 of 10 samples exceed the objective.
*FRANZ CREEK for the COLD beneficial use has one LOE (325303) and 1 of 1 sample exceeds the objective.
*RUSSIAN RIVER for the COLD beneficial use has five LOEs (42634, 101762, 116401, 325297, 325369) and 0 of 16 samples exceed the objective.

*BIG SULPHUR CREEK for the COMM beneficial use has two LOEs (116393, 325290) and 0 of 7 samples exceed the objective.
*RUSSIAN RIVER for the COMM beneficial use has four LOEs (42733, 101764, 116396, 325340) and 0 of 13 samples exceed the objective.

*BIG SULPHUR CREEK for the MUN beneficial use has two LOEs (116395, 325337) and 0 of7 samples exceed the objective.
*FRANZ CREEK for the MUN beneficial use has one LOE (325345) and 1 of 1 sample exceeds the objective.
*RUSSIAN RIVER for the MUN beneficial use has eight LOEs (42783, 101763, 116402, 123986, 123987, 123988, 123999, 325265) and 0 of 60 samples exceed the objective.

*BIG SUPHUR CREEK for the WARM beneficial use has one LOE (325336) and 0 of 2 samples exceed the objective.
*FRANZ CREEK for the WARM beneficial use has one LOE (325277) and 1 of 1 sample exceeds the objective.
*RUSSIAN RIVER for the WARM beneficial use has one LOE (325361) and 1 of 1 sample exceeds the objective.

LOE ID:

101734

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, gamma-.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for gamma-BHC (Lindane, gamma-HCH) to protect of human health from the consumption of water and organisms is 0.019 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43684

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

***For the SEDIMENT MATRIX:
*RUSSIAN RIVER for the COLD beneficial use has one LOE (122303) and 0 of 1 sample exceeds the objective.
*RUSSIAN RIVER for the WARM beneficial use has two LOEs (43648, 121942) and 0 of 2 samples exceed the objective.

***For the TISSUE MATRIX:
*RUSSIAN RIVER for the COMM beneficial use has one LOE (322573) and 1 of 1 sample exceeds the objective and consist of 32 trophic level 4 fish (CDFW legal limit). Fish used in the COMM assessment are limited to lengths that are within Calif. Dept. of Fish and Wildlife legal size limits applicable to this waterbody.
*RUSSIAN RIVER for the WILD beneficial use has two LOES (322588, 322678) and 2 of 2 samples exceed the objective; however, the samples were collected on the same day. LOE 322588 is for the Sport fish objective and 1 of 1 samples exceed the mercury objective and consist of 32 trophic level 4 fish. (CDFW legal limit). LOE 322678 is for the Prey fish objective and 1 of 1 samples exceed the mercury objective and consist of 60 50-150mm prey fish.

***For the DISSOLVED FRACTION of the WATER MATRIX:
*MAACAMA CREEK for the COLD beneficial use has one LOE (328504) and 0 of 3 samples exceed the objective.
*MAACAMA CREEK for the COMM beneficial use has one LOE (328482) and 0 of 3 samples exceed the objective.
*MAACAMA CREEK for the MUN beneficial use has one LOE (328499) and 0 of 3 samples exceed the objective.
*MAACAMA CREEK for the WARM beneficial use has one LOE (328514) and 0 of 3 samples exceed the objective.

***For the TOTAL FRACTION of the WATER MATRIX:
*BIG SULPHUR CREEK for the COLD beneficial use has three LOEs (116394, 325289, 325378) and 0 of 10 samples exceed the objective.
*FRANZ CREEK for the COLD beneficial use has one LOE (325303) and 1 of 1 sample exceeds the objective.
*RUSSIAN RIVER for the COLD beneficial use has five LOEs (42634, 101762, 116401, 325297, 325369) and 0 of 16 samples exceed the objective.

*BIG SULPHUR CREEK for the COMM beneficial use has two LOEs (116393, 325290) and 0 of 7 samples exceed the objective.
*RUSSIAN RIVER for the COMM beneficial use has four LOEs (42733, 101764, 116396, 325340) and 0 of 13 samples exceed the objective.

*BIG SULPHUR CREEK for the MUN beneficial use has two LOEs (116395, 325337) and 0 of7 samples exceed the objective.
*FRANZ CREEK for the MUN beneficial use has one LOE (325345) and 1 of 1 sample exceeds the objective.
*RUSSIAN RIVER for the MUN beneficial use has eight LOEs (42783, 101763, 116402, 123986, 123987, 123988, 123999, 325265) and 0 of 60 samples exceed the objective.

*BIG SUPHUR CREEK for the WARM beneficial use has one LOE (325336) and 0 of 2 samples exceed the objective.
*FRANZ CREEK for the WARM beneficial use has one LOE (325277) and 1 of 1 sample exceeds the objective.
*RUSSIAN RIVER for the WARM beneficial use has one LOE (325361) and 1 of 1 sample exceeds the objective.

State Board Decision Recommendation:

Decision written by SWRCB staff.

Listing Extent:

="67%">QAPP not required for USGS projects

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325350

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Mercury.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Regi align="left" valign="top" width="33%">Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for Lindane (gamma-HCH) is 4.99 ug/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42383

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hester Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325337

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322588

Pollutant:

Mercury

LOE Subgroup:

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42437

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116369

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, gamma-.

Data Reference:

Water Quality Assessment Data for the 2018 sol="67%">Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 1 of 1 sample exceeded the water quality threshold for Mercury. Monitors collected 2 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish and 11 composites of Smallmouth Bass composed of 2 fish each. This LOE contains data only for trophic level 4 fish whose average length was inside the legal size limits as described by the California Department of Fish and Wildlife Fishing Regulations. Fish collected within the same calendar year were averaged into a single sample for comparison with the objective. All 32 fish were collected in a single calendar year, which resulted in 1 independent sample. The exceeding sample was for 2015.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Statewide Sport Fish Water Quality Objective for the protection of Wildlife Habitat comes from the Statewide Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California, and is 0.2 mg/Kg wet weight skinless fillet samples of trophic level 3, or trophic level 4 fish (whichever is highest in the water body) over a one year averaging period. If trophic level 3 fish are used in the assessment then the Prey Fish Water Quality Objective must also be used to determine that the Sport Fish Objective is being met. Trophic levels of applicable fish are defined in, but not limited to those in Attachment C of the Final Regulatory Language document (Appendix A) of State Water Resources Control Board Resolution No. 2017-0027.

Guideline Reference:

Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325340

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for gamma-BHC (Lindane, gamma-HCH) to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.95 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116368

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, gamma-.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for gamma-BHC (Lindane, gamma-HCH) to protect human health from consumption of organisms only is 0.063 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328499

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-04-10 and 2017-05-08

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43683

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for Lindane (gamma-HCH) is 4.99 ug/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42444

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328514

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-04-10 and 2017-05-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328504

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMIC

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42358

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-04-10 and 2017-05-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325336

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Mercury.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322497

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322507

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322573

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 1 of 1 sample exceeded the water quality threshold for Mercury. Monitors collected 2 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish and 11 composites of Smallmouth Bass composed of 2 fish each. This LOE contains data only for trophic level 4 fish whose average length was inside the legal size limits as described by the California Department of Fish and Wildlife Fishing Regulations. Fish collected within the same calendar year were averaged into a single sample for comparison with the objective. All 32 fish were collected in a single calendar year, which resulted in 1 independent sample. The exceeding sample was for 2015.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Statewide Sport Fish Water Quality Objective for the protection of the Commercial and Sport Fishing beneficial comes from the Statewide Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California, and is 0.2 mg/Kg wet weight skinless fillet samples of trophic level 3, or trophic level 4 fish (whichever is highest in the water body) over a one year averaging period. Trophic levels of applicable fish are defined in, but not limited to those in Attachment C of the Final Regulatory Language document (Appendix A) of State Water Resources Control Board Resolution No. 2017-0027.

Guideline Reference:

Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169057, Mercury

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Guideline Reference:

Air Toxics Hotspots Program Risk Assessment Guidelines. Part ll Technical Support Document for Describing Available Cancer Potency Values.

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322508

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157565, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101736

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for HCH, gamma-.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for gamma-BHC (Lindane, gamma-HCH) to protect human health from consumption of organisms only is 0.063 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

M: 3px; WIDTH: 100%; text-align: right; PADDING-TOP: 3px; font-smooth: always">Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325277 Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 1 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L. Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road). Temporal Representation: The samples were collected between the dates of 2019-01-16 and 2019-01-16 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 322678 Pollutant: Mercury LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet Beneficial Use: Wildlife Habitat Number of Samples: 1 Number of Exceedances: 1 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 1 of 1 sample exceeded the water quality threshold for Mercury. Monitors collected 3 composites: 1 composite of Sacramento Pikeminnow composed of 20 fish, 1 composite of Sacramento Sucker composed of 20 fish, and 1 composite of Tule Perch composed of 20 fish. All fish collected within the same calendar year with a reported length of 50-150 mm were averaged into a single sample, independent of species or trophic level, for comparison with the objective. All 60 fish were collected in a single calendar year, which resulted in 1 independent sample. The exceeding sample was for 2015. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan for the North Coast Region) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The Statewide Prey Fish Water Quality Objective for the protection of Wildlife Habitat comes from the Statewide Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California, and is 0.05 mg/Kg wet weight whole fish samples of any fish species between 50 to 150 mm in total length collected between February 1 and July 31. (SWRCB Resolution No. 2017-0027) Guideline Reference: Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy Spatial Representation: Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP). Temporal Representation: Data for this line of evidence were collected between 2015-08-03 and 2015-08-03. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes. Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 122303 Pollutant: Mercury LOE Subgroup: Pollutant-Sediment Matrix: Sediment Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Mercury . Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan for the North Coast Region). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for mercury in 1.06 mg/Kg dry weight (MacDonald et al. 2000a) Guideline Reference: Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 Spatial Representation:

DECISION ID

157566

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Linuron
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

IRIS Reference Summary (Various Pollutants) Water

Line of Evidence (LOE) for Decision ID 157566, Linuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325194

Pollutant:

Linuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Linuron.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Based on USEPA IRIS reference dose (RfD) as a drinking water level, the drinking water health advisory level for linuron is 1.4 ug/L.

Guideline Reference:

Data were collected from 1 station(s). Station Code(s): 114RR5568.

Temporal Representation:

Data for this waterbody were collected over the date range 2015-08-03 to 2015-08-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

121942

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for mercury in 1.06 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568.

Temporal Representation:

Data for this waterbody were collected over the date range 2015-08-03 to 2015-08-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116394

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157566, Linuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325188

Pollutant:

Linuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Linuron.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for linuron is the USEPA Aquatic Life Benchmark of 0.09 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157566, Linuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116387

Pollutant:

Linuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Mercury.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116401

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Eva align="left" valign="top" width="33%">Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Linuron.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Linuron is the USEPA Aquatic Life Benchmark of 0.09 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157566, Linuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116390

Pollutant:

Linuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Linuron.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Linuron is the USEPA Aquatic Life Benchmark of 0.09 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157566, Linuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116388

Pollutant:

Linuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Linuron.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Based on USEPA IRIS reference dose (RfD) as a drinking water level, the drinking water health advisory level for linuron is 1.4 µg/L.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157566, Linuron	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325192

Pollutant:

Linuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Linuron.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for linuron is the USEPA Aquatic Life Benchmark of 0.09 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

luation Guideline: National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L. Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-09-28 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 42634 Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Mercury. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to Total mercury is 0.77 ug/L. Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 101762 Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Mercury. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L. Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5568) Temporal Representation: The samples were collected between the dates of 2015-08-03 and 2015-08-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116395 Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 6 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Mercury. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Qualit


DECISION ID	157567	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Malathion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 42706 has been replaced by LOE 349976 and LOE 42769 has been replaced by LOE 349981 due to a reassessment of data using the UC Davis Aquatic Life Criterion threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157567, Malathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349976

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Malathion. Although a total of 3 samples were collected, 3 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

&y Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101763

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5568)

Temporal Representation:

The samples were collected between the dates of 2015-08-03 and 2015-08-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Evaluation Guideline:

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157567, Malathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

349981

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Malathion. Although a total of 3 samples were collected, 3 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157567, Malathion	Region 1 OP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123987

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: Two sample results were not used in this assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Comminski Station - 114RRCOMM]

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123986

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325207

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157567, Malathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325212

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Malathion.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Mercury, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123999

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 21 samples exceed the criterion for Mercury, Total. Two sample results were not used in this assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water health advisory for malathion is 500 ug/L.

Guideline Reference:

2018 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157567, Malathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325211

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157567, Malathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108692

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157567, Malathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108690

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 6/22/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123988

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 21 samples exceed the criterion for Mercury, Total. Two sample results were not used in this assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/21/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116402

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOlign="left" valign="top" width="33%">Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157567, Malathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108694

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157567, Malathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108691

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157567, Malathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111038

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157567, Malathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111034

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

E ID: 42783 Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Mercury. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325290 Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (Cal


DECISION ID	169057	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:

Mercury

Final Listing Decision:

Do Not List on 303(d) list (TMDL required list)

Last Listing Cycle's Final Listing Decision:

Do Not List on 303(d) list (TMDL required list)(2018)

Revision Status

Revised

Impairment from Pollutant or Pollution:

Pollutant

Regional Board Conclusion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325345

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Mercury.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

<"top" width="25%">Regional Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:	**For the SEDIMENT MATRIX: RUSSIAN RIVER for the COLD beneficial use has one LOE (122303) and 0 of 1 sample exceeds the objective. RUSSIAN RIVER for the WARM beneficial use has two LOEs (43648, 121942) and 0 of 2 samples exceed the objective. *For the TISSUE MATRIX: RUSSIAN RIVER for the COMM beneficial use has one LOE (322573) and 1 of 1 sample exceeds the objective and consist of 32 trophic level 4 fish (CDFW legal limit). Fish used in the COMM assessment are limited to lengths that are within Calif. Dept. of Fish and Wildlife legal size limits applicable to this waterbody. RUSSIAN RIVER for the WILD beneficial use has two LOES (322588, 322678) and 2 of 2 samples exceed the objective; however, the samples were collected on the same day. LOE 322588 is for the Sport fish objective and 1 of 1 samples exceed the mercury objective and consist of 32 trophic level 4 fish. (CDFW legal limit). LOE 322678 is for the Prey fish objective and 1 of 1 samples exceed the mercury objective and consist of 60 50-150mm prey fish. *For the DISSOLVED FRACTION of the WATER MATRIX: MAACAMA CREEK for the COLD beneficial use has one LOE (328504) and 0 of 3 samples exceed the objective. MAACAMA CREEK for the COMM beneficial use has one LOE (328482) and 0 of 3 samples exceed the objective. MAACAMA CREEK for the MUN beneficial use has one LOE (328499) and 0 of 3 samples exceed the objective. MAACAMA CREEK for the WARM beneficial use has one LOE (328514) and 0 of 3 samples exceed the objective. *For the TOTAL FRACTION of the WATER MATRIX: BIG SULPHUR CREEK for the COLD beneficial use has three LOEs (116394, 325289, 325378) and 0 of 10 samples exceed the objective. FRANZ CREEK for the COLD beneficial use has one LOE (325303) and 1 of 1 sample exceeds the objective. RUSSIAN RIVER for the COLD beneficial use has five LOEs (42634, 101762, 116401, 325297, 325369) and 0 of 16 samples exceed the objective. BIG SULPHUR CREEK for the COMM beneficial use has two LOEs (116393, 325290) and 0 of 7 samples exceed the objective. RUSSIAN RIVER for the COMM beneficial use has four LOEs (42733, 101764, 116396, 325340) and 0 of 13 samples exceed the objective. BIG SULPHUR CREEK for the MUN beneficial use has two LOEs (116395, 325337) and 0 of7 samples exceed the objective. FRANZ CREEK for the MUN beneficial use has one LOE (325345) and 1 of 1 sample exceeds the objective. RUSSIAN RIVER for the MUN beneficial use has eight LOEs (42783, 101763, 116402, 123986, 123987, 123988, 123999, 325265) and 0 of 60 samples exceed the objective. BIG SUPHUR CREEK for the WARM beneficial use has one LOE (325336) and 0 of 2 samples exceed the objective. FRANZ CREEK for the WARM beneficial use has one LOE (325277) and 1 of 1 sample exceeds the objective. RUSSIAN RIVER for the WARM beneficial use has one LOE (325361) and 1 of 1 sample exceeds the objective.

State Board Decision Recommendation:	Decision written by SWRCB staff.

Listing Extent:

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325350

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Mercury.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Regi/table>

LOE ID:

325265

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325297

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Mercury.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325369

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Mercury, Methyl.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169057, Mercury

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325337

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322588

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 1 of 1 sample exceeded the water quality threshold for Mercury. Monitors collected 2 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish and 11 composites of Smallmouth Bass composed of 2 fish each. This LOE contains data only for trophic level 4 fish whose average length was inside the legal size limits as described by the California Department of Fish and Wildlife Fishing Regulations. Fish collected within the same calendar year were averaged into a single sample for comparison with the objective. All 32 fish were collected in a single calendar year, which resulted in 1 independent sample. The exceeding sample was for 2015.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325340

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWpx; font-smooth: always">Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325361

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Mercury.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328482

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-04-10 and 2017-05-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325303

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Mercury.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328499

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-04-10 and 2017-05-08

Environmental Conditions:

QAPP Information:

Line of Evidence (LOE) for Decision ID 169057, Mercury

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325378

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Mercury, Methyl.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

QAPP not required for USGS projects

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325289

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Mercury.

Data Reference:

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328514

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-04-10 and 2017-05-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328504

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICords/region_1/2022/ref5888.xlsx">Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43648

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for mercury is 1.06 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-04-10 and 2017-05-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325336

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Mercury.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42733

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116393

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Boeft" valign="top" width="67%">The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322573

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 1 of 1 sample exceeded the water quality threshold for Mercury. Monitors collected 2 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish and 11 composites of Smallmouth Bass composed of 2 fish each. This LOE contains data only for trophic level 4 fish whose average length was inside the legal size limits as described by the California Department of Fish and Wildlife Fishing Regulations. Fish collected within the same calendar year were averaged into a single sample for comparison with the objective. All 32 fish were collected in a single calendar year, which resulted in 1 independent sample. The exceeding sample was for 2015.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 169057, Mercury

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116396

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5568)

Temporal Representation:

The samples were collected between the dates of 2015-08-03 and 2015-08-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101764

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

M: 3px; WIDTH: 100%; text-align: right; PADDING-TOP: 3px; font-smooth: always">Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325277

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Mercury.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322678

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 1 of 1 sample exceeded the water quality threshold for Mercury. Monitors collected 3 composites: 1 composite of Sacramento Pikeminnow composed of 20 fish, 1 composite of Sacramento Sucker composed of 20 fish, and 1 composite of Tule Perch composed of 20 fish. All fish collected within the same calendar year with a reported length of 50-150 mm were averaged into a single sample, independent of species or trophic level, for comparison with the objective. All 60 fish were collected in a single calendar year, which resulted in 1 independent sample. The exceeding sample was for 2015.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Statewide Prey Fish Water Quality Objective for the protection of Wildlife Habitat comes from the Statewide Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California, and is 0.05 mg/Kg wet weight whole fish samples of any fish species between 50 to 150 mm in total length collected between February 1 and July 31. (SWRCB Resolution No. 2017-0027)

Guideline Reference:

Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

122303

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for mercury in 1.06 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

DECISION ID

167509

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Merphos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

< water, and 0.00003 mg/kg/day as the reference dose.

Line of Evidence (LOE) for Decision ID 167509, Merphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101770

Pollutant:

Merphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Merphos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA expected safe lifetime exposure limit in drinking water for Merphos, calculated using the IRIS Reference Dose, is 0.2 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinkingtop" width="67%">Data were collected from 1 station(s). Station Code(s): 114RR5568.

Temporal Representation:

Data for this waterbody were collected over the date range 2015-08-03 to 2015-08-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

121942

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for mercury in 1.06 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568.

Temporal Representation:

Data for this waterbody were collected over the date range 2015-08-03 to 2015-08-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116394

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167509, Merphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124001

Pollutant:

Merphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Merphos, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167509, Merphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116406

Pollutant:

Merphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Merphos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA expected safe lifetime exposure limit in drinking water for Merphos, calculated using the IRIS Reference Dose, is 0.2 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.00003 mg/kg/day as the reference dose.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167509, Merphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124012

Pollutant:

Merphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Merphos, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167509, Merphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124000

Pollutant:

Merphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Merphos, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

td align="left" valign="top" width="67%">Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 6 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Mercury. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L. Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-09-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116401 Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 7 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Mercury. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L. Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-09-28 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1


DECISION ID	157593	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Methidathion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 42747 has been replaced by LOE 350025 and LOE 42468 has been replaced by LOE 350035 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325392

Pollutant:

Methidathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Methidathion.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Based on USEPA IRIS reference dose (RfD) as a drinking water level, the drinking water health advisory level for methidathion is 0.7 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, and 20% relative source contribution from drinking water. An additional uncertainty factor of 10 is used for Class C carcinogens.

Guideline Reference:

IRIS Database Calculations (summary)

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325391

Pollutant:

Methidathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Methidathion.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101762

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Mercury.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5568)

Temporal Representation:

The samples were collected between the dates of 2015-08-03 and 2015-08-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116395

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Qualit

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325387 Pollutant: Methidathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Methidathion. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104899 Pollutant: Methidathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Methidathion. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or y Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-09-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 101763 Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Mercury. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5568) Temporal Representation: The samples were collected between the dates of 2015-08-03 and 2015-08-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116408

Pollutant:

Methidathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Methidathion.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123987

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: Two sample results were not used in this assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Comminski Station - 114RRCOMM]

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123986

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Mercury, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123999

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 21 samples exceed the criterion for Mercury, Total. Two sample results were not used in this assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116410 Pollutant: Methidathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Methidathion. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116409 Pollutant: Methidathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Methidathion. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 350025 Pollutant: Methidathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Methidathion. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2007-11-26 and 2008-07-14 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157593, Methidathion

Region 1 n="top" width="33%">SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 6/22/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123988

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 21 samples exceed the criterion for Mercury, Total. Two sample results were not used in this assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 350035 Pollutant: Methidathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Methidathion. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2007-11-26 and 2008-07-14 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124015 Pollutant: Methidathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 10 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 10 samples exceed the criterion for Methidathion, Total. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 6/21/2001-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116402 Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 7 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Mercury. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-09-28 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LO" valign="top" width="33%">Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for methoxychlor is 0.03 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124014 Pollutant: Methidathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 40 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 40 samples exceed the criterion for Methidathion, Total. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for methoxychlor is 0.03 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): 42783 Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Mercury. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124013 Pollutant: Methidathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 40 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 40 samples exceed the criterion for Methidathion, Total. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for methoxychlor is 0.03 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104898 Pollutant: Methidathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Methidathion. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116407 Pollutant: Methidathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Methidathion. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program ifornia Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325345 Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 1 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road). Temporal Representation: The samples were collected between the dates of 2019-01-16 and 2019-01-16 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325265 Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325297 Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018) Objective/Criterion Reference:

DECISION ID

157591

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Methiocarb
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157591, Methiocarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104901

Pollutant:

Methiocarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Methiocarb.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Methiocarb is the USEPA Aquatic Life Benchmark of 2.75 ug/L for an invertebrate (acute).

Guideline Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325369

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Mercury, Methyl.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169057, Mercury

OPP Aquatic Life Benchmarks

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157591, Methiocarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104900

Pollutant:

Methiocarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Methiocarb.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Methiocarb is the USEPA Aquatic Life Benchmark of 2.75 ug/L for an invertebrate (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157591, Methiocarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325401

Pollutant:

Methiocarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Methiocarb.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for methiocarb is the USEPA Aquatic Life Benchmark of 2.75 ug/L for an invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157591, Methiocarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325404

Pollutant:

Methiocarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Methiocarb.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for methiocarb is the USEPA Aquatic Life Benchmark of 2.75 ug/L for an invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

px; font-smooth: always">Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325361 Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L. Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328482 Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Mercury. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA). Temporal Representation: The samples were collected between the dates of 2017-04-10 and 2017-05-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325303 Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 1 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L. Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road). Temporal Representation: The samples were collected between the dates of 2019-01-16 and 2019-01-16 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP



DECISION ID	157592	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Methomyl
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 111537 has been replaced by LOE 350047 and LOE 104904 has been replaced by LOE 350046 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157592, Methomyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325419

Pollutant:

Methomyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Methomyl.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Based on USEPA IRlign: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 169057, Mercury

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325378 Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Mercury, Methyl. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L. Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325289 Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Mercury. Data Reference: Guideline Reference: IRIS Reference Summary (Various Pollutants) Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157592, Methomyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325414 Pollutant: Methomyl LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Methomyl. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for methomyl is the USEPA Aquatic Life Benchmark of 0.6 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157592, Methomyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325412 Pollutant: Methomyl Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L. Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 43648 Pollutant: Mercury LOE Subgroup: Pollutant-Sediment Matrix: Sediment Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Mercury. Data Reference: Statewide Stream Pollution Trends Study 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for mercury is 1.06 mg/Kg dry weight (MacDonald et al. 2000). Guideline Reference: Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ] Temporal Representation: Data was collected on a single day 10/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Methomyl. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for methomyl is the USEPA Aquatic Life Benchmark of 0.6 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157592, Methomyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104903 Pollutant: Methomyl LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Methomyl. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Based on USEPA IRIS reference dose (RfD) as a drinking water level, the drinking water health advisory level for methomyl is 180 µg/L. Guideline Reference: IRIS Reference Summary (Various Pollutants) Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157592, Methomyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 350047 Pollutant: Methomyl LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Methomyl. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for methomyl is the USEPA Aquatic Life Benchmark of 0.6 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157592, Methomyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 350046 Pollutant: Methomyl LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Methomyl. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for methomyl is the USEPA Aquatic Life Benchmark of 0.6 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP lign="top" width="67%">Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 42733 Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Mercury. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116393 Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 6 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Bo


DECISION ID	167510	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Methoxychlor
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167510, Methoxychlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42519

Pollutant:

Methoxychlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life instantaneous maximum for methoxychlor is 0.03 µg/L.

Guideline Reference:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116396

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5568)

Temporal Representation:

The samples were collected between the dates of 2015-08-03 and 2015-08-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169057, Mercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101764

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

lity Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167510, Methoxychlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 42504 Pollutant: Methoxychlor LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Methoxychlor. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for methoxychlor is 0.03 mg/L. Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167510, Methoxychlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104906 Pollutant: Methoxychlor LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Methoxychlor. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for methoxychlor is 0.03 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167510, Methoxychlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104907 Pollutant: Methoxychlor LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Methoxychlor. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA national ambient water quality criterion for freshwater aquatic life Criterion Continuous Concentration (CCC) expressed as a 4-day average for methoxychlor is 0.03 µg/L. Guideline Reference:

DECISION ID

167509

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Merphos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167509, Merphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101770

Pollutant:

Merphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Merphos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA expected safe lifetime exposure limit in drinking water for Merphos, calculated using the IRIS Reference Dose, is 0.2 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.00003 mg/kg/day as the reference dose.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167509, Merphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124001

Pollutant:

Merphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Merphos, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167510, Methoxychlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42485

Pollutant:

Methoxychlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life instantaneous maximum for methoxychlor is 0.03 µg/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167510, Methoxychlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104909

Pollutant:

Line of Evidence (LOE) for Decision ID 167509, Merphos

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116406

Pollutant:

Merphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Merphos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA expected safe lifetime exposure limit in drinking water for Merphos, calculated using the IRIS Reference Dose, is 0.2 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.00003 mg/kg/day as the reference dose.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167509, Merphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124012

Pollutant:

Merphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Merphos, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167509, Merphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124000

Pollutant:

Merphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Merphos, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

lign="top" width="67%">Methoxychlor LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Methoxychlor. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for methoxychlor is 0.03 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167510, Methoxychlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104905 Pollutant: Methoxychlor LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Methoxychlor. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA national ambient water quality criterion for freshwater aquatic life Criterion Continuous Concentration (CCC) expressed as a 4-day average for methoxychlor is 0.03 µg/L. Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	157593	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Methidathion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 42747 has been replaced by LOE 350025 and LOE 42468 has been replaced by LOE 350035 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325392

Pollutant:

Methidathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Methidathion.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Referen


DECISION ID	157569	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Methyl Parathion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

106426

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the water quality standard for Parathion, Methyl. Although a total of 4 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

IRIS Database Calculations (summary)

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325391

Pollutant:

Methidathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Methidathion.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Hazard Assessment of the Insecticide Methyl Parathion to Aquatic Organisms in the Sacramento River System

Line of Evidence (LOE) for Decision ID 157593, Methidathion

Region 1

left" valign="top" width="67%">The California Department of Fish and Game instantaneous criteria for Methyl Parathion is 0.08 ug/L.

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s): (Station Codes 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

109836

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Parathion, Methyl.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Parathion, Methyl as a drinking water level is a concentration of 0.001 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325387

Pollutant:

Methidathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Methidathion.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104899

Pollutant:

Methidathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Methidathion.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations which are toxic to, or align="top" width="33%">LOE ID:

109837

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Parathion, Methyl.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Parathion, Methyl as a drinking water level is a concentration of 0.001 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

107634

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the water quality standard for Parathion, Methyl. Although a total of 4 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Nowhich produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116408

Pollutant:

Methidathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Methidathion.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157593, Methidathion

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Department of Fish and Game instantaneous criteria for Methyl Parathion is 0.08 ug/L.

Guideline Reference:

Hazard Assessment of the Insecticide Methyl Parathion to Aquatic Organisms in the Sacramento River System

Spatial Representation:

Data was collected from 1 station(s): (Station Codes 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326328

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Department of Fish and Game instantaneous aquatic life criterion for methyl parathion is 0.08 ug/L.

Guideline Reference:

Hazard Assessment of the Insecticide Methyl Parathion to Aquatic Organisms in the Sacramento River System

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326334

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Department of Fish and Game instantaneous aquatic life criterion for methyl parathion is 0.08 ug/L.

Guideline Reference:

Hazard Assessment of the Insecticide Methyl Parathion to Aquatic Organisms in the Sacramento River System

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

44106

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for methyl parathion is the median lethal concentration (LC50) of 6 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 6 ug/g is the geometric mean of LC50 values for methyl parathion from Ding et al. (2011).

Guideline Reference:

Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

44107

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42837

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The California Department of Fish and Game instantaneous criteria for Methyl Parathion is 0.08 ug/L.

Guideline Reference:

Hazard Assessment of the Insecticide Methyl Parathion to Aquatic Organisms in the Sacramento River System

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42823

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitsmooth: always">Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116410

Pollutant:

Methidathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Methidathion.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116409

Pollutant:

Methidathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Methidathion.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/at

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The California Department of Fish and Game instantaneous criteria for Methyl Parathion is 0.08 ug/L.

Guideline Reference:

Hazard Assessment of the Insecticide Methyl Parathion to Aquatic Organisms in the Sacramento River System

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

109839

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Parathion, Methyl.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Parathion, Methyl as a drinking water level is a concentration of 0.001 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350025

Pollutant:

Methidathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350035

Pollutant:

Methidathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124015

Pollutant:

Methidathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 10 samples exceed the criterion for Methidathion, Total. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

115572

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Department of Fish and Game instantaneous criteria for Methyl Parathion is 0.08 ug/L.

Guideline Reference:

Hazard Assessment of the Insecticide Methyl Parathion to Aquatic Organisms in the Sacramento River System

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326332

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Parathion, Methyl.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Parathion, Methyl as a drinking water level is a concentration of 0.001 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

" valign="top" width="33%">Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for methoxychlor is 0.03 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124014

Pollutant:

Methidathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 40 samples exceed the criterion for Methidathion, Total. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for methoxychlor is 0.03 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

DECISION ID

105118

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Methylmercury
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	"This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the one samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met."

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 105118, Methylmercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116403

Pollutant:

Methylmercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Mercury, Methyl.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Mercury, methyl criterion for the protection of human health from consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5568)

Temporal Representation:

The samples were collected between the dates of 2015-08-03 and 2015-08-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 105118, Methylmercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116404

Pollutant:

Methylmercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Mercury, Methyl.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The methylmercury criterion for the protection of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5568)

Temporal Representation:

The samples were collected between the dates of 2015-08-03 and 2015-08-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

gov/water_issues/programs/tmdl/records/state_board/2008/ref2413.pdf" >Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157593, Methidathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA


DECISION ID	167511	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Mevinphos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167511, Mevinphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124028

Pollutant:

Mevinphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Mevinphos, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167511, Mevinphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124027

Pollutant:

Mevinphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Mevinphos, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167511, Mevinphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124026

Pollutant:

Mevinphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Mevinphos, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	157591	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Methiocarb
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157591, Methiocarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104901

Pollutant:

Methiocarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Methiocarb.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Methiocarb is the USEPA Aquatic Life Benchmark of 2.75 ug/L for an invertebrate (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157591, Methiocarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104900

Pollutant:

Methiocarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Methiocarb.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Methiocarb is the USEPA Aquatic Life Benchmark of 2.75 ug/L for an invertebrate (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157591, Methiocarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325401

Pollutant:

Methiocarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Methiocarb.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for methiocarb is the USEPA Aquatic Life Benchmark of 2.75 ug/L for an invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157591, Methiocarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325404

Pollutant:

Methiocarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Methiocarb.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for methiocarb is the USEPA Aquatic Life Benchmark of 2.75 ug/L for an invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1


DECISION ID	161492	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Microcystins
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 161492, Microcystins	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325484

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 10 samples exceeded the water quality threshold for Microcystins, Total.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

USEPA 10-day microcystin health advisory for bottle-fed infants and young children of pre-school age is 0.3 ug/L.

Guideline Reference:

Drinking Water Health Advisory for the Cyanobacterial Microcystin Toxins

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2017-05-24 and 2017-10-17

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161492, Microcystins	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325450

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Microcystins, Total.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 6 ug/L of microcystins as the water concentration protective of swimmers and other contact recreational users including water-skiing/jet-skiing, fishing, boating, sail boarding, and canoeing.

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2017-05-24 and 2017-10-17

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161492, Microcystins	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325456

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Microcystins, Total.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

California Office of Environmental Health Hazard Assessment (OEHHA) established 2 ug/L of microcystins as the subchronic water concentration for dog intake/ingestion (Office of Environmental Health Hazard Assessment Public Health Action Level for microcystin and Human Recreational Uses (May 2012)). OEHHA Action Level for subchronic water intake, dog.

Guideline Reference:

Toxicological Summary and Suggested Action Levels to Reduce Potential Adverse Health Effects of Six Cyanotoxins

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2017-05-24 and 2017-10-17

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1


DECISION ID	157570	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Mirex
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157570, Mirex	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322699

Pollutant:

Mirex

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of 0 samples exceeded the water quality threshold for Mirex. Monitors collected 3 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish, 1 composite of Sacramento Sucker composed of 10 fish, and 1 composite of Smallmouth Bass composed of 6 fish. Because no composites were collected within the same averaging period, these composites represent 3 independent samples. These samples were not used in the assessment because the laboratory data reporting limits were above the objectives and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The modified OEHHA Fish Contaminant Goal for mirex in fish tissue is 0.28 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008; OEHHA, 1992)

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Guideline Reference:

Expedited Cancer Potency Values and Proposed Regulatory Levels for Certain Proposition 65 Carcinogens.

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157570, Mirex	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111168

Pollutant:

Mirex

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The criterion continuous concentration from the USEPA national ambient water quality criterion for the protection of freshwater aquatic life for mirex is 0.001 µg/L.

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program


DECISION ID	157592	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Methomyl
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 111537 has been replaced by LOE 350047 and LOE 104904 has been replaced by LOE 350046 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157592, Methomyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325419

Pollutant:

Methomyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Methomyl.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Based on USEPA IRIS reference dose (RfD) as a drinking water level, the drinking water health advisory level for methomyl is 180 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157592, Methomyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325414

Pollutant:

Methomyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Methomyl.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for methomyl is the USEPA Aquatic Life Benchmark of 0.6 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157592, Methomyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325412

Pollutant:

Methomyl

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157570, Mirex	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42535

Pollutant:

Mirex

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The criterion continuous concentration from the USEPA national ambient water quality criterion for the protection of freshwater aquatic life for mirex is 0.001 µg/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157570, Mirex	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

106328

Pollutant:

Mirex

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Methomyl.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for methomyl is the USEPA Aquatic Life Benchmark of 0.6 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157592, Methomyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104903

Pollutant:

Methomyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Methomyl.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Based on USEPA IRIS reference dose (RfD) as a drinking water level, the drinking water health advisory level for methomyl is 180 µg/L.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157592, Methomyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350047

Pollutant:

Methomyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Methomyl.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for methomyl is the USEPA Aquatic Life Benchmark of 0.6 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157592, Methomyl	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350046

Pollutant:

Methomyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Methomyl.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for methomyl is the USEPA Aquatic Life Benchmark of 0.6 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The criterion continuous concentration from the USEPA national ambient water quality criterion for the protection of freshwater aquatic life for mirex is 0.001 µg/L.

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157570, Mirex	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42538

Pollutant:

Mirex

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The criterion continuous concentration from the USEPA national ambient water quality criterion for the protection of freshwater aquatic life for mirex is 0.001 µg/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan


DECISION ID	167510	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Methoxychlor
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167510, Methoxychlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42519

Pollutant:

Methoxychlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life instantaneous maximum for methoxychlor is 0.03 µg/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167510, Methoxychlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42504

Pollutant:

Methoxychlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for methoxychlor is 0.03 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167510, Methoxychlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104906

Pollutant:

Methoxychlor

LOE Subgroup:

Pollutant-Water

Matrix:

DECISION ID

157571

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Molinate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 42587 has been replaced by LOE 350132 and LOE 42609 has been replaced by LOE 350124 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Water

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104910

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Molinate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Molinate is the USEPA Aquatic Life Benchmark of 105 ug/L for a fish (acute).

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Methoxychlor.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167510, Methoxychlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104907

Pollutant:

Methoxychlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Methoxychlor.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life Criterion Continuous Concentration (CCC) expressed as a 4-day average for methoxychlor is 0.03 µg/L.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104913

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Molinate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Molinate is the USEPA Aquatic Life Benchmark of 105 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124038

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Molinate, Total. Twenty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for molinate is 0.02 mg/L

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104917

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Molinate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP oards.ca.gov/water_issues/programs/tmdl/records/state_board/2016/ref4321.pdf" >National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167510, Methoxychlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42485

Pollutant:

Methoxychlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life instantaneous maximum for methoxychlor is 0.03 µg/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167510, Methoxychlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104909

Pollutant:

Methoxychlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Methoxychlor.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167510, Methoxychlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104905

Pollutant:

Methoxychlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Methoxychlor.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life Criterion Continuous Concentration (CCC) expressed as a 4-day average for methoxychlor is 0.03 µg/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for molinate is 0.02 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124039 Pollutant: Molinate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Molinate, Total. Twenty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for molinate is 0.02 mg/L Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104911 Pollutant: Molinate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Molinate. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for molinate is 0.02 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104918 Pollutant: Molinate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0

DECISION ID

157569

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Methyl Parathion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

106426

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the water quality standard for Parathion, Methyl. Although a total of 4 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Molinate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Molinate is the USEPA Aquatic Life Benchmark of 105 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124040

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Molinate, Total. Five sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for molinate is 0.02 mg/L

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

The California Department of Fish and Game instantaneous criteria for Methyl Parathion is 0.08 ug/L.

Guideline Reference:

Hazard Assessment of the Insecticide Methyl Parathion to Aquatic Organisms in the Sacramento River System

Spatial Representation:

Data was collected from 1 station(s): (Station Codes 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

109836

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Parathion, Methyl.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Parathion, Methyl as a drinking water level is a concentration of 0.001 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104914

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Molinate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350124

LOE ID:

109837

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Parathion, Methyl.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Parathion, Methyl as a drinking water level is a concentration of 0.001 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

107634

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the water quality standard for Parathion, Methyl. Although a total of 4 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, No"top" width="33%">Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for molinate is the USEPA Aquatic Life Benchmark of 105 ug/L for a fish (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350132

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for molinate is the USEPA Aquatic Life Benchmark of 105 ug/L for a fish (acute).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Department of Fish and Game instantaneous criteria for Methyl Parathion is 0.08 ug/L.

Guideline Reference:

Hazard Assessment of the Insecticide Methyl Parathion to Aquatic Organisms in the Sacramento River System

Spatial Representation:

Data was collected from 1 station(s): (Station Codes 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326328

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Department of Fish and Game instantaneous aquatic life criterion for methyl parathion is 0.08 ug/L.

Guideline Reference:

Hazard Assessment of the Insecticide Methyl Parathion to Aquatic Organisms in the Sacramento River System

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325565

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Molinate.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for molinate is the USEPA Aquatic Life Benchmark of 105 ug/L for a fish (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325568

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326334

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Department of Fish and Game instantaneous aquatic life criterion for methyl parathion is 0.08 ug/L.

Guideline Reference:

Hazard Assessment of the Insecticide Methyl Parathion to Aquatic Organisms in the Sacramento River System

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

44106

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

44107

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temalign="top" width="33%">Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Molinate.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325569

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Molinate.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for molinate is the USEPA Aquatic Life Benchmark of 105 ug/L for a fish (acute).

Guideline Reference:

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42837

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The California Department of Fish and Game instantaneous criteria for Methyl Parathion is 0.08 ug/L.

Guideline Reference:

Hazard Assessment of the Insecticide Methyl Parathion to Aquatic Organisms in the Sacramento River System

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42823

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitwidth="33%">Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104915

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Molinate.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Molinate is the USEPA Aquatic Life Benchmark of 105 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42561

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Benefiat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The California Department of Fish and Game instantaneous criteria for Methyl Parathion is 0.08 ug/L.

Guideline Reference:

Hazard Assessment of the Insecticide Methyl Parathion to Aquatic Organisms in the Sacramento River System

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

109839

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Parathion, Methyl.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Parathion, Methyl as a drinking water level is a concentration of 0.001 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for molinate is 0.02 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104916

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Molinate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Molinate is the USEPA Aquatic Life Benchmark of 105 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104912

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Molinate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Molinate is the USEPA Aquatic Life Benchmark of 105 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

d align="left" valign="top" width="33%">Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 115572 Pollutant: Methyl Parathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Parathion, Methyl. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The California Department of Fish and Game instantaneous criteria for Methyl Parathion is 0.08 ug/L. Guideline Reference: Hazard Assessment of the Insecticide Methyl Parathion to Aquatic Organisms in the Sacramento River System Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP). Temporal Representation: Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157569, Methyl Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326332 Pollutant: Methyl Parathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Parathion, Methyl. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Parathion, Methyl as a drinking water level is a concentration of 0.001 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP


DECISION ID	158483	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Molybdenum
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 158483, Molybdenum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328571

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

DECISION ID

105118

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Methylmercury
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	"This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the one samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met."

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 105118, Methylmercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116403

Pollutant:

Methylmercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Mercury, Methyl.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Mercury, methyl criterion for the protection of human health from consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5568)

Temporal Representation:

The samples were collected between the dates of 2015-08-03 and 2015-08-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 105118, Methylmercury	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116404

Pollutant:

Methylmercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Mercury, Methyl.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The methylmercury criterion for the protection of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5568)

Temporal Representation:

The samples were collected between the dates of 2015-08-03 and 2015-08-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

state_board/2012/ref4281.pdf" >2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158483, Molybdenum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328574 Pollutant: Molybdenum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Agricultural Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Molybdenum. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The recommended maximum concentration of molybdenum in irrigation water is 0.01 mg/L. Guideline Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158483, Molybdenum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328565 <


DECISION ID	167511	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Mevinphos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167511, Mevinphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124028

Pollutant:

Mevinphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Mevinphos, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Secttd align="left" valign="top" width="33%">Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158483, Molybdenum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328575

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The recommended maximum concentration of molybdenum in irrigation water is 0.01 mg/L.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158483, Molybdenum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328560

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158483, Molybdenum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328562

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The recommended maximum concentration of molybdenum in irrigation water is 0.01 mg/L.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

ion 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167511, Mevinphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124027 Pollutant: Mevinphos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Mevinphos, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167511, Mevinphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124026 Pollutant: Mevinphos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Mevinphos, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	167512	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Naled
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167512, Naled	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124050

Pollutant:

Naled

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Naled, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167512, Naled	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124052

Pollutant:

Naled

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Naled, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167512, Naled	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124051

Pollutant:

Naled

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Naled, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	161492	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Microcystins
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 161492, Microcystins	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325484

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 10 samples exceeded the water quality threshold for Microcystins, Total.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

USEPA 10-day microcystin health advisory for bottle-fed infants and young children of pre-school age is 0.3 ug/L.

Guideline Reference:

Drinking Water Health Advisory for the Cyanobacterial Microcystin Toxins

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2017-05-24 and 2017-10-17

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161492, Microcystins	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325450

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Microcystins, Total.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2017-05-24 and 2017-10-17

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161492, Microcystins	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325456

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Microcystins, Total.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Toxicological Summary and Suggested Action Levels to Reduce Potential Adverse Health Effects of Six Cyanotoxins

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2017-05-24 and 2017-10-17

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1


DECISION ID	157570	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Mirex
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157570, Mirex	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322699

Pollutant:

Mirex

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of 0 samples exceeded the water quality threshold for Mirex. Monitors collected 3 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish, 1 composite of Sacramento Sucker composed of 10 fish, and 1 composite of Smallmouth Bass composed of 6 fish. Because no composites were collected within the same averaging period, these composites represent 3 independent samples. These samples were not used in the assessment because the laboratory data reporting limits were above the objectives and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Guideline Reference:

Expedited Cancer Potency Values and Proposed Regulatory Levels for Certain Proposition 65 Carcinogens.

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157570, Mirex	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111168

Pollutant:

Mirex

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The criterion continuous concentration from the USEPA national ambient water quality criterion for the protection of freshwater aquatic life for mirex is 0.001 µg/L.

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program


DECISION ID	157572	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Nickel
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Forty-seven lines of evidence are available in the administrative record to assess this pollutant. One of 22 samples exceed the COLD and WARM beneficial use criterion for the dissolved fraction of water. Zero of seven samples exceed the COMM and MUN criteria for the dissolved fraction of water. Zero samples exceed the objective for the total fraction of water. One of one sample exceed the COLD and WARM beneficial use criteria for the total fraction of sediment. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of 22 samples exceed the COLD and WARM beneficial use criterion for the dissolved fraction of water. Zero of seven samples exceed the COMM and MUN criteria for the dissolved fraction of water. Zero samples exceed the objective for the total fraction of water. One of one sample exceed the COLD and WARM beneficial use criteria for the total fraction of sediment. This does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325691

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nickel.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The dissolved nickel criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 52 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325681

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nickel.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157572, Nickel

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157570, Mirex	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42535

Pollutant:

Mirex

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The criterion continuous concentration from the USEPA national ambient water quality criterion for the protection of freshwater aquatic life for mirex is 0.001 µg/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157570, Mirex	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

106328

Pollutant:

Mirex

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325685

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nickel.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325626

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Nickel.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The criterion continuous concentration from the USEPA national ambient water quality criterion for the protection of freshwater aquatic life for mirex is 0.001 µg/L.

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157570, Mirex	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42538

Pollutant:

Mirex

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The criterion continuous concentration from the USEPA national ambient water quality criterion for the protection of freshwater aquatic life for mirex is 0.001 µg/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124063

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceed the criterion for Nickel, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Comminski Station - 114RRCOMM]

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

46869

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Zero of 25 samples exceeded the nickel objective. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008). This LOE contains data originally evaluated in LOE 21544, which included data from a site that is not in this water body. The data from LOE 21544 have been re-assessed and the data are now evaluated under the correct water body.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

At the Cloverdale site samples were collected over 22 site visits at each site from June 2001 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

46873

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water


DECISION ID	157571	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Molinate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 42587 has been replaced by LOE 350132 and LOE 42609 has been replaced by LOE 350124 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Guideline Reference:

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104910

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Molinate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Molinate is the USEPA Aquatic Life Benchmark of 105 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104913

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Molinate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Molinate is the USEPA Aquatic Life Benchmark of 105 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124038

Pollutant:

Molinate

Ltd align="left" valign="top" width="33%">Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Zero of 27 samples exceeded the nickel objective. This LOE contains data originally evaluated in LOE 21544 from the 2010 Integrated Report, which included data from a site that is not in this water body. The data from LOE 21544 have been re-assessed and the data are now evaluated under the correct water body. Data were also reassessed in order to evaluate nickel and chromium data in their own individual LOEs.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328613

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP OE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Molinate, Total. Twenty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for molinate is 0.02 mg/L

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104917

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Molinate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328611

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124039

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Molinate, Total. Twenty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for molinate is 0.02 mg/L

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related#CCCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 157572, Nickel

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328628

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328599

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104911

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Molinate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104918

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328632

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157572, Nickel

Region 1

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Molinate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Molinate is the USEPA Aquatic Life Benchmark of 105 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124040

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Molinate, Total. Five sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for molinate is 0.02 mg/L

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328622

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328600

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

ign="left" valign="top" width="33%">Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104914

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Molinate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350124

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328594

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104920

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104922

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Standards 2000."top" width="33%">Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for molinate is the USEPA Aquatic Life Benchmark of 105 ug/L for a fish (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350132

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for molinate is the USEPA Aquatic Life Benchmark of 105 ug/L for a fish (acute).

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104923

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104921

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325565

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Molinate.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for molinate is the USEPA Aquatic Life Benchmark of 105 ug/L for a fish (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325568

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Nickel.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43711

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Galign="top" width="33%">Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Molinate.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325569

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Molinate.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for molinate is the USEPA Aquatic Life Benchmark of 105 ug/L for a fish (acute).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for nickel is 48.6 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43712

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for nickel is 48.6 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157572, Nickel

Region 1

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104915

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Molinate.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Molinate is the USEPA Aquatic Life Benchmark of 105 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42561

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for molinate is 0.02 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104916

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Molinate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Molinate is the USEPA Aquatic Life Benchmark of 105 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157571, Molinate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104912

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Molinate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Molinate is the USEPA Aquatic Life Benchmark of 105 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

round-color:#CCCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 33101 Pollutant: Nickel LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: None of the 4 samples exceeded the hardness based criteria calculated for nickel. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Samples collected at station 114RR5652 (Russian River at Crocker Road). Temporal Representation: Samples collected between 11/26/2007 and 7/14/2008. Environmental Conditions: QAPP Information: SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104926 Pollutant: Nickel LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 6 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Nickel. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-09-28 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 43026 Pollutant: Nickel LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Nickel. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4.6 mg/L (California Toxics Rule, 2000). Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104924 Pollutant: Nickel LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 6 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Nickel. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-09-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124064 Pollutant: Nickel LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 23 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 23 samples exceed the criterion for Nickel, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 <


DECISION ID	158483	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Molybdenum
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 158483, Molybdenum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328571

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158483, Molybdenum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328574

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The recommended maximum concentration of molybdenum in irrigation water is 0.01 mg/L.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158483, Molybdenum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328565

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/21/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104927

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124062

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Nickel, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124065

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158483, Molybdenum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328575

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The recommended maximum concentration of molybdenum in irrigation water is 0.01 mg/L.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158483, Molybdenum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328560

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158483, Molybdenum	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328562

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The recommended maximum concentration of molybdenum in irrigation water is 0.01 mg/L.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

7%">Municipal & Domestic Supply Number of Samples: 23 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 23 samples exceed the criterion for Nickel, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 6/22/2001-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104925 Pollutant: Nickel LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 6 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Nickel. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.


DECISION ID	167512	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Naled
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167512, Naled	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124050

Pollutant:

Naled

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Naled, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42986

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325637

listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167512, Naled	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124052

Pollutant:

Naled

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Naled, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167512, Naled	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124051

Pollutant:

Naled

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Naled, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Pollutant: Nickel LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 1 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Nickel. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The dissolved nickel criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 52 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road). Temporal Representation: The samples were collected between the dates of 2019-01-16 and 2019-01-16 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325674 Pollutant: Nickel LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325619 Pollutant: Nickel LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325673

DECISION ID

157572

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Nickel
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Forty-seven lines of evidence are available in the administrative record to assess this pollutant. One of 22 samples exceed the COLD and WARM beneficial use criterion for the dissolved fraction of water. Zero of seven samples exceed the COMM and MUN criteria for the dissolved fraction of water. Zero samples exceed the objective for the total fraction of water. One of one sample exceed the COLD and WARM beneficial use criteria for the total fraction of sediment. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of 22 samples exceed the COLD and WARM beneficial use criterion for the dissolved fraction of water. Zero of seven samples exceed the COMM and MUN criteria for the dissolved fraction of water. Zero samples exceed the objective for the total fraction of water. One of one sample exceed the COLD and WARM beneficial use criteria for the total fraction of sediment. This does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325691

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nickel.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325681

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nickel.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

IGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: right; PADDING-TOP: 3px; font-smooth: always">Region 1

Line of Evidence (LOE) for Decision ID 157572, Nickel

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325702

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325685

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nickel.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325626

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Nickel.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325684

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325636

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

WaThe dissolved nickel criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 52 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124063

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceed the criterion for Nickel, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Comminski Station - 114RRCOMM]

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Watter

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325652

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulationer Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

46869

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

46873

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325658

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325611

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328613

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP >

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325650

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328611

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325708

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nickel.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328597

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Line of Evidence (LOE) for Decision ID 157572, Nickel

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328628

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328599

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:0

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328629

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328625

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328636

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

> Non-SWAMP Water Quality Objective/Criterion: The dissolved nickel criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 52 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328632 Pollutant: Nickel LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nickel. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328622 Pollutant: Nickel LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The dissolved nickel criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 52 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328600 Pollutant: Nickel LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nickel. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The dissolved nickel criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 52 ug/L (California Toxics Rule, 2000).


DECISION ID	157573	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157573, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328659

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for nitrate + nitrite (as N) that is incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157573, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328665

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-05-01 and 2017-05-01

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157573, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328669

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328594

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104920

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157573, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325803

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104922

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104923

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104921

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157573, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328648

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157573, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111801

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114PS0229)

Temporal Representation:

The samples were collected between the dates of 2013-06-04 and 2013-06-04

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157573, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43074

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nitrate+nitrite (sum as nitrogen) is 10.0 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157573, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114226

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114CR0903)

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157573, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325832

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Nitrate + Nitrite as N.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2017-07-18 and 2017-09-14

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

td align="left" valign="top" width="33%">Pollutant: Nickel LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 6 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Nickel. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-09-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 43711 Pollutant: Nickel LOE Subgroup: Pollutant-Sediment Matrix: Sediment Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 1 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceed the criterion for Nickel. Data Reference: Statewide Stream Pollution Trends Study 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for nickel is 48.6 mg/Kg dry weight (MacDonald et al. 2000). Guideline Reference: Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ] Temporal Representation: Data was collected on a single day 10/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 43712 Pollutant: Nickel LOE Subgroup: Pollutant-Sediment Matrix: Sediment Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 1 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceed the criterion for Nickel. Data Reference: Statewide Stream Pollution Trends Study 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for nickel is 48.6 mg/Kg dry weight (MacDonald et al. 2000). Guideline Reference: Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ] Temporal Representation: Data was collected on a single day 10/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA


DECISION ID	161381	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Nitrogen, Nitrate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Beneficial Use: 1-04-12 and 2011-11-30

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328728

Pollutant:

Nitrate as Nitrate (NO3)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for nitrate (as NO3) incorporated by reference in the Water Quality Control Plan, North Coast Basin is 45.0 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) , animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43026

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157572, Nickel

Region 1

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325908

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for nitrate (NO3 as N) incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328692

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104924

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Nickel.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124064

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 23 samples exceed the criterion for Nickel, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-05-01 and 2017-05-01

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328676

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325898

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2019-06-25 and 2019-06-25

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328694

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328675

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate

Region 1 /tr>

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/21/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104927

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124062

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Nickel, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124065

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

47485

Pollutant:

Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 2 nitrate samples collected from Foss Creek exceed the evaluation guideline. The sample concentrations range from 0.7 to 0.8 mg/l. The samples were collected as part of the Russian River First Flush sampling event. Data are summarized by Katznelson et al. (2003). This LOE replaces LOE 6213 from the 2010 Integrated Report cycle. The original LOE was replace in order to update the Nitrate objective to the MCL of 10 mg/L.

Data Reference:

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (2011): Waters designated for MUN shall not contain concentrations of chemical constituents in excess of the MCL specified in Title 22 of the California Code of Regulations. The nitrate (as N) MCL is 10 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from 2 sites in Foss Creek as follows: (1) in Foss Creek in downtown Healdsburg, and (2) in Upper Foss Creek.

Temporal Representation:

The samples were collected on November 7, 2002. At each site, 3 instantaneous grab samples were collected over half hour increments. The data are averaged for each site.

Environmental Conditions:

Samples were collected during the first runoff event of the rainy season.

QAPP Information:

Samples were collected in accordance with the study plan and quality control procedures described by Katznelson et al. (2003).

QAPP Information Reference(s):

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

32894

Pollutant:

Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 19 samples exceed the water quality objective for nitrate. The nitrate MCL objective is 10 mg/L as N.

Data Reference:

Data for Bacteria and Nutrient in Sonoma County Water Agency, 2009-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Russian River at Alexander Valley Campground

Temporal Representation:

Samples were collected from 05/28/2009 to 10/01/2009.

Environmental Conditions:

QAPP Information:

No quality assurance information was provided.

QAPP Information Reference(s):

Quality Assurance Project Plan for Region One for Bacteriological Sampling.

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

6213

Pollutant:

Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): The water quality objective for nitrate as nitrogen is 45 mg/l.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from 2 sites in Foss Creek as follows: (1) in Foss Creek in downtown Healdsburg, and (2) in Upper Foss Creek.

Temporal Representation:

The samples were collected on November 7, 2002. At each site, 3 instantaneous grab samples were collected over half hour increments. The data are averaged for each site.

Environmental Conditions:

Samples were collected during the first runoff event of the rainy season.

QAPP Information:

Samples were collected in accordance with the study plan and quality control procedures described by Katznelson et al. (2003).

QAPP Information Reference(s):

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate

Region 1

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 23 samples exceed the criterion for Nickel, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 6/22/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104925

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42986

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325637

DTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104931

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Nitrate as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2010-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104933

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Nitrate as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2010-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

109679

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114CR0903)

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104934

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Nickel.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325674

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325619

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325673

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Nitrate as N.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2011-04-12 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104935

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Nitrate as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 201%">Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325702

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104936

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrate as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328707

Pollutant:

Nitrate as Nitrate (NO3)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328715

Pollutant:

Nitrate as Nitrate (NO3)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-05-01 and 2017-05-01

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328719

Pollutant:

Nitrate as Nitrate (NO3)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325684 Pollutant: Nickel LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325636 Pollutant: Nickel LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325652 Pollutant: Nickel LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road). Temporal Representation: The samples were collected between the dates of 2019-01-16 and 2019-01-16 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325658 Pollutant: Nickel LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325611 Pollutant: Nickel LOE Subgroup: Pollutant-Water Matrix: Water Fraction:

DECISION ID

161462

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Nitrogen, Nitrite
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

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Line of Evidence (LOE) for Decision ID 161462, Nitrogen, Nitrite	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104940

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161462, Nitrogen, Nitrite	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104939

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161462, Nitrogen, Nitrite	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104230

Pollutant:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325650

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325708

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nickel.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328597

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed DFW_ABL_Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrite as N.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114CR0903)

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-08-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161462, Nitrogen, Nitrite	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326020

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2019-06-25 and 2019-06-25

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161462, Nitrogen, Nitrite	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328744

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 161462, Nitrogen, Nitrite	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328757

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328629

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328625

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157572, Nickel	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328636

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nitrite as N. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 161462, Nitrogen, Nitrite	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 42806 Pollutant: Nitrite as Nitrite NO2 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Nitrite as N. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L. Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 161462, Nitrogen, Nitrite	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104937 Pollutant: Nitrogen, Nitrite LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 7 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Nitrite as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-09-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161462, Nitrogen, Nitrite	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326031 Pollutant: Nitrogen, Nitrite LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nitrite as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP


DECISION ID	157573	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157573, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328659

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157573, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328665

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-05-01 and 2017-05-01

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157573, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328669

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

DECISION ID

167513

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Oxadiazon
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 104946 has been replaced by LOE 350250, LOE 104943 has been replaced by LOE 350225, LOE 104948 has been replaced by LOE 350261, and LOE 104945 has been replaced by LOE 350201 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167513, Oxadiazon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350250

Pollutant:

Oxadiazon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Oxadiazon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Oxadiazon is the USEPA Aquatic Life Benchmark of 0.88 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 167513, Oxadiazon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350225

Pollutant:

Oxadiazon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Oxadiazon.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Oxadiazon is the USEPA Aquatic Life Benchmark of 0.88 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 167513, Oxadiazon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350191

Pollutant:

Oxadiazon

LOE Subgroup:

Pollutant-Water

Matrix:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157573, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325803

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Oxadiazon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Oxadiazon is the USEPA Aquatic Life Benchmark of 0.88 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 167513, Oxadiazon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124078

Pollutant:

Oxadiazon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Oxadiazon, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157573, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328648

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157573, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111801

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167513, Oxadiazon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124076

Pollutant:

Oxadiazon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Oxadiazon, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance top" width="33%">Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114PS0229)

Temporal Representation:

The samples were collected between the dates of 2013-06-04 and 2013-06-04

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157573, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43074

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nitrate+nitrite (sum as nitrogen) is 10.0 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157573, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114226

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114CR0903)

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157573, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325832

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Nitrate + Nitrite as N.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2017-07-18 and 2017-09-14

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167513, Oxadiazon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124077 Pollutant: Oxadiazon LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Oxadiazon, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167513, Oxadiazon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104944 Pollutant: Oxadiazon LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Oxadiazon. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA expected safe lifetime exposure limit in drinking water for Oxdiazon, calculated using the IRIS Reference Dose, is 35 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.005 mg/kg/day as the reference dose. Guideline Reference: IRIS Reference Summary (Various Pollutants) Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167513, Oxadiazon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA


DECISION ID	161381	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Nitrogen, Nitrate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328728

Pollutant:

Nitrate as Nitrate (NO3)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan)

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA expected safe lifetime exposure limit in drinking water for Oxdiazon, calculated using the IRIS Reference Dose, is 35 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.005 mg/kg/day as the reference dose.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167513, Oxadiazon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350261

Pollutant:

Oxadiazon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Oxadiazon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Oxadiazon is the USEPA Aquatic Life Benchmark of 0.88 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 167513, Oxadiazon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350193

Pollutant:

Oxadiazon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Oxadiazon.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Oxadiazon is the USEPA Aquatic Life Benchmark of 0.88 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 167513, Oxadiazon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350201

Pollutant:

Oxadiazon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Oxadiazon.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Oxadiazon is the USEPA Aquatic Life Benchmark of 0.88 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325908 Pollutant: Nitrogen, Nitrate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nitrate as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate (NO3 as N) incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328692 Pollutant: Nitrogen, Nitrate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nitrate as N. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate (NO3 as N) incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA). Temporal Representation: The samples were collected between the dates of 2017-05-01 and 2017-05-01 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328676 Pollutant: Nitrogen, Nitrate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nitrate as N. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate (NO3 as N) incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information:

DECISION ID

157574

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Oxamyl (Vydate)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157574, Oxamyl (Vydate)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104949

Pollutant:

Oxamyl (Vydate)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Oxamyl.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for Oxamyl incorporated by reference in the Water Quality Control Plan, North Coast Basin is 50 ug/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157574, Oxamyl (Vydate)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326059

Pollutant:

Oxamyl (Vydate)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Oxamyl.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for oxamyl is the USEPA Aquatic Life Benchmark of 27 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157574, Oxamyl (Vydate)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326068

Pollutant:

Oxamyl (Vydate)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Oxamyl.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for oxamyl is the USEPA Aquatic Life Benchmark of 27 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157574, Oxamyl (Vydate)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326060

Pollutant:

Oxamyl (Vydate)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Oxamyl.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for Oxamyl incorporated by reference in the Water Quality Control Plan, North Coast Basin is 50 ug/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

%">QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325898 Pollutant: Nitrogen, Nitrate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nitrate as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate (NO3 as N) incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport). Temporal Representation: The samples were collected between the dates of 2019-06-25 and 2019-06-25 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328694 Pollutant: Nitrogen, Nitrate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nitrate as N. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate (NO3 as N) incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328675 Pollutant: Nitrogen, Nitrate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nitrate as N. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate (NO3 as N) incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate

Region 1


DECISION ID	167514	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Oxychlordane
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167514, Oxychlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124089

Pollutant:

Oxychlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Oxychlordane, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167514, Oxychlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124091

Pollutant:

Oxychlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Oxychlordane, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167514, Oxychlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124090

Pollutant:

Oxychlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Oxychlordane, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 47485 Pollutant: Nitrate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: None of the 2 nitrate samples collected from Foss Creek exceed the evaluation guideline. The sample concentrations range from 0.7 to 0.8 mg/l. The samples were collected as part of the Russian River First Flush sampling event. Data are summarized by Katznelson et al. (2003). This LOE replaces LOE 6213 from the 2010 Integrated Report cycle. The original LOE was replace in order to update the Nitrate objective to the MCL of 10 mg/L. Data Reference: 2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (2011): Waters designated for MUN shall not contain concentrations of chemical constituents in excess of the MCL specified in Title 22 of the California Code of Regulations. The nitrate (as N) MCL is 10 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected from 2 sites in Foss Creek as follows: (1) in Foss Creek in downtown Healdsburg, and (2) in Upper Foss Creek. Temporal Representation: The samples were collected on November 7, 2002. At each site, 3 instantaneous grab samples were collected over half hour increments. The data are averaged for each site. Environmental Conditions: Samples were collected during the first runoff event of the rainy season. QAPP Information: Samples were collected in accordance with the study plan and quality control procedures described by Katznelson et al. (2003). QAPP Information Reference(s): 2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 32894 Pollutant: Nitrate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 19 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: None of the 19 samples exceed the water quality objective for nitrate. The nitrate MCL objective is 10 mg/L as N. Data Reference: Data for Bacteria and Nutrient in Sonoma County Water Agency, 2009-2010. SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (2011): Waters designated for MUN shall not contain concentrations of chemical constituents in excess of the MCL specified in Title 22 of the California Code of Regulations. The nitrate (as N) MCL is 10 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Samples were collected at Russian River at Alexander Valley Campground Temporal Representation: Samples were collected from 05/28/2009 to 10/01/2009. Environmental Conditions: QAPP Information: No quality assurance information was provided. QAPP Information Reference(s): Quality Assurance Project Plan for Region One for Bacteriological Sampling.

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 6213 Pollutant: Nitrate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: None of the 2 nitrate samples collected from Foss Creek exceed the evaluation guideline. The sample concentrations range from 0.7 to 0.8 mg/l. The samples were collected as part of the Russian River First Flush sampling event. Data are summarized by Katznelson et al. (2003). Data Reference: 2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): The water quality objective for nitrate as nitrogen is 45 mg/l. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1) Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected from 2 sites in Foss Creek as follows: (1) in Foss Creek in downtown Healdsburg, and (2) in Upper Foss Creek. Temporal Representation: The samples were collected on November 7, 2002. At each site, 3 instantaneous grab samples were collected over half hour increments. The data are averaged for each site. Environmental Conditions: Samples were collected during the first runoff event of the rainy season. QAPP Information: Samples were collected in accordance with the study plan and quality control procedures described by Katznelson et al. (2003). QAPP Information Reference(s): 2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1


DECISION ID	157578	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	PCBs (Polychlorinated biphenyls)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

DTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

25473

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

2150

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 2,150 polychlorinated biphenyl (PCB) analytes collected in the mainstem Russian River exceed the evaluation guideline. Each of the 43 samples were analyzed for 50 PCB cogeners. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008).

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007, p. 3-4.00): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.

LOE ID: 104931 Pollutant: Nitrogen, Nitrate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Nitrate as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate (NO3 as N) incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-09-30 and 2010-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104933 Pollutant: Nitrogen, Nitrate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Nitrate as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate (NO3 as N) incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1) Evaluation Guideline: Per the "Public Health Goal for Water Soluble Polychlorinated Biphenyls Expected to Found in Drinking Water" (OEHHA 2007): The health-protective concentration of water-soluble PCBs in
drinking water associated with a one in one million extra lifetime cancer risk is 0.09 ug/L. Guideline Reference: Public Health Goal for Water Soluble Polychlorinated Biphenyls Expected to Be Found in Drinking Water. Pesticide and Environmental Toxicology Branch, Office of Environmental Health Hazard Assessment, California Environmental Protection Agency Spatial Representation: Samples were collected from the mainstem Russian River at 6 locations as follows: (1) at Cloverdale (SWAMP Station ID 114RRCLO1), (2) downstream of the Cloverdale Water Treatment Plant (SWAMP Station ID 114CLOSTP), and (3) at Healdsburg Memorial Beach (SWAMP Station ID 114RRHMB1). Samples were collected from well-mixed flows in glides or riffles. Temporal Representation: At the Cloverdale and Healdsburg Memorial Beach sites, samples were collected over 22 site visits at each site from June 2001 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104981 Pollutant: PCBs (Polychlorinated biphenyls) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for PCBs (Polychlorinated biphenyls). Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The total PCB Congeners criterion for the protection of human health from consumption of organisms only is 0.00017 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Sta4527.pdf" >Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-09-28 and 2010-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 109679 Pollutant: Nitrogen, Nitrate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed DFW_ABL_Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Nitrate as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring. SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate (NO3 as N) incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114CR0903) Temporal Representation: The samples were collected between the dates of 2013-08-26 and 2013-09-25 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104934 Pollutant: Nitrogen, Nitrate LOE Subgroup: Pollutant-Water Matrix: ndard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326342 Pollutant: PCBs (Polychlorinated biphenyls) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Shellfish Harvesting Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for PCBs (Polychlorinated biphenyls). Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The PCB criterion for the protection of human health from consumption of water and organisms is 0.00017 ug/L and is equal to the maximum of the sum of aroclors or congeners (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326337 Pollutant: PCBs (Polychlorinated biphenyls) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 0 Fraction: Not Recorded Beneficial Use: Municipal & Domestic Supply Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Nitrate as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate (NO3 as N) incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2011-04-12 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104935 Pollutant: Nitrogen, Nitrate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Not Recorded Beneficial Use: Municipal & Domestic Supply Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Nitrate as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate (NO3 as N) incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 201align="top" width="33%">Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for PCBs (Polychlorinated biphenyls). Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The PCB criterion for the protection of human health from consumption of water and organisms is 0.00017 ug/L and is equal to the maximum of the sum of aroclors or congeners (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326344 Pollutant: PCBs (Polychlorinated biphenyls) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for PCBs (Polychlorinated biphenyls). Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The PCB criterion for the protection of human health from consumption of water and organisms is 0.00017 ug/L and is equal to the maximum of the sum of aroclors or congeners (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 322714 Pollutant: PCBs (Polychlorinated biphenyls) LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet Beneficial Use: Cold Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of 3 samples exceeded the water quality threshold for PCBs (Polychlorinated biphenyls). Monitors collected 3 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish, 1 composite of Sacramento Sucker composed of 10 fish, and 1 composite of Smallmouth Bass composed of 6 fish. Because no composites were collected within the same averaging period, these composites represent 3 independent samples. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan for the North Coast Region) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: National Academy of Science guidelines (NAS 1972) establish a maximum total PCB Arochlor concentration of 500 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances. Guideline Reference: National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency Spatial Representation: Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP). Temporal Representation: Data for this line of evidence were collected between 2015-08-03 and 2015-08-03. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes. Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)

Region 1

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104936

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrate as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328707

Pollutant:

Nitrate as Nitrate (NO3)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328715

Pollutant:

Nitrate as Nitrate (NO3)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-05-01 and 2017-05-01

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 161381, Nitrogen, Nitrate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328719

Pollutant:

Nitrate as Nitrate (NO3)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA LOE ID: 322730 Pollutant: PCBs (Polychlorinated biphenyls) LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet Beneficial Use: Warm Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of 3 samples exceeded the water quality threshold for PCBs (Polychlorinated biphenyls). Monitors collected 3 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish, 1 composite of Sacramento Sucker composed of 10 fish, and 1 composite of Smallmouth Bass composed of 6 fish. Because no composites were collected within the same averaging period, these composites represent 3 independent samples. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan for the North Coast Region) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: National Academy of Science guidelines (NAS 1972) establish a maximum total PCB Arochlor concentration of 500 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances. Guideline Reference: National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency Spatial Representation: Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP). Temporal Representation: Data for this line of evidence were collected between 2015-08-03 and 2015-08-03. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes. Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 109845 Pollutant: PCBs (Polychlorinated biphenyls) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for PCBs (Polychlorinated biphenyls). Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The total PCB Congeners criterion for the protection of human health from consumption of water and organisms is 0.00017 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104980 Pollutant: PCBs (Polychlorinated biphenyls) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for PCBs (Polychlorinated biphenyls). Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The total PCB Congeners criterion for the protection of human health from consumption of water and organisms is 0.00017 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 103771 Pollutant: PCBs (Polychlorinated biphenyls) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for PCBs (Polychlorinated biphenyls). Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The total PCB Congeners criterion for the protection of human health from consumption of water and organisms is 0.00017 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 46521 Pollutant: PCBs (Polychlorinated biphenyls) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: The method detection limit for all 24 of the samples was greater than the criteria: thus the data was not used in this assessment. All of the 24 samples were either measured as non-detect or were measured as detected but not quantified with reporting limits below objectives or evaluation guidelines. Each of the 24 samples were analyzed for 50 PCB cogeners. The samples were collected as part of the Surface Water Ambient Water Monitori


DECISION ID	161462	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Nitrogen, Nitrite
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

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Line of Evidence (LOE) for Decision ID 161462, Nitrogen, Nitrite	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104940

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161462, Nitrogen, Nitrite	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104939

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161462, Nitrogen, Nitrite	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104230

Pollutant:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Revised Draft of the 2007 Review of the Monitoring Data for the Irrigated Lands Regulatory Conditional Waiver Program

Evaluation Guideline:

Per the "Public Health Goal for Water Soluble Polychlorinated Biphenyls Expected to Found in Drinking Water" (OEHHA 2007): The health-protective concentration of water-soluble PCBs in drinking water associated with a one in one million extra lifetime cancer risk is 0.09 ug/L.

Guideline Reference:

Public Health Goal for Water Soluble Polychlorinated Biphenyls Expected to Be Found in Drinking Water. Pesticide and Environmental Toxicology Branch, Office of Environmental Health Hazard Assessment, California Environmental Protection Agency

Spatial Representation:

Temporal Representation:

At the Cloverdale site samples were collected over 22 site visits from June 2001 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33363

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

The method detection limit for all 3 of the non-detect samples was greater than the criteria: thus the data was not used in this assessment.

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The total PCB criterion for the protection of human health from the consumption of water and organisms is 0.00017 ug/L. This value corresponds to total PCBs, eg., the sum of all congener or isomer or homolog or aroclor analyses (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples were collected on 11/26/2007, 4/7/2008, and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33228

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Zero of 1 sample collected for Total PCBs exceeded the evaluation guideline.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for total PCB is 676 ug/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected at the following station 114RRAXRV (Russian River at Alexander RV Park).

Temporal Representation:

The samples were collected on 10/14/2008.

Environmental Conditions:

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33340Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed DFW_ABL_Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114CR0903)

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-08-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161462, Nitrogen, Nitrite	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326020

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2019-06-25 and 2019-06-25

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161462, Nitrogen, Nitrite	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328744

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 161462, Nitrogen, Nitrite	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328757

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 2 samples exceeded the criterion continuous concentration for total PCB. The water body was assessed for the 3 aroclors that were contained within the data set and they include aroclor 1248, aroclor 1254, and aroclor 1260.

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The total PCB criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.014 ug/L. This value corresponds to the sum of aroclors 1242, 1254, 1221, 1232, 1248, 1260, and 1016 (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples collected on 4/7/2008 and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

109840

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for PCBs (Polychlorinated biphenyls).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The total PCB Congeners criterion for the protection of human health from consumption of organisms only is 0.00017 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111614

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for PCBs (Polychlorinated biphenyls).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The total PCB Congeners criterion for the protection of human health from consumption of organisms only is 0.00017 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322727

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of 3 samples exceeded the water quality threshold for PCBs (Polychlorinated biphenyls). Monitors collected 3 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish, 1 composite of Sacramento Sucker composed of 10 fish, and 1 composite of Smallmouth Bass composed of 6 fish. Because no composites were collected within the same averaging period, these composites represent 3 independent samples.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The modified OEHHA Fish Contaminant Goal for polychlorinated biphenyls in fish tissue is 2.6 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008)

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 161462, Nitrogen, Nitrite	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 161462, Nitrogen, Nitrite	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 161462, Nitrogen, Nitrite	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA


DECISION ID	157576	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Parathion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157576, Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

113319

Pollutant:

Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life Criterion Continuous Concentration (expressed as a 4 Day average) for parathion is 0.013 µg/L.

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157576, Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

113318

Pollutant:

Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life Criterion Continuous Concentration (expressed as a 4 Day average) for parathion is 0.013 µg/L.

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157576, Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43059

Pollutant:

Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life 4-hour maximum for parathion is 0.013 µg/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157576, Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43105

Pollutant:

Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP


DECISION ID	167513	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Oxadiazon
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 104946 has been replaced by LOE 350250, LOE 104943 has been replaced by LOE 350225, LOE 104948 has been replaced by LOE 350261, and LOE 104945 has been replaced by LOE 350201 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167513, Oxadiazon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350250

Pollutant:

Oxadiazon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Oxadiazon.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guidelin

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life 4-hour maximum for parathion is 0.013 µg/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157576, Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114033

Pollutant:

Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life Criterion Continuous Concentration (expressed as a 4 Day average) for parathion is 0.013 µg/L.

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Ine for Oxadiazon is the USEPA Aquatic Life Benchmark of 0.88 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 167513, Oxadiazon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350225

Pollutant:

Oxadiazon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Oxadiazon.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Oxadiazon is the USEPA Aquatic Life Benchmark of 0.88 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 167513, Oxadiazon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350191

Pollutant:

Oxadiazon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Oxadiazon.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Oxadiazon is the USEPA Aquatic Life Benchmark of 0.88 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 167513, Oxadiazon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124078

Pollutant:

Oxadiazon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Oxadiazon, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157576, Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326311

Pollutant:

Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life Criterion Continuous Concentration (expressed as a 4 Day average) for parathion is 0.013 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157576, Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326310

Pollutant:

Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended freshwater aquatic life ambient water quality chronic criteria for parathion is 0.013 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

valuation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167513, Oxadiazon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124076 Pollutant: Oxadiazon LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Oxadiazon, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167513, Oxadiazon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 167513, Oxadiazon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104944 Pollutant:


DECISION ID	167516	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Permethrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167516, Permethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350267

Pollutant:

Permethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The chronic criterion for permethrin is 1 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of permethrin were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167516, Permethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43980

Pollutant:

Permethrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for permethrin is the median lethal concentration (LC50) of 8.9 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 8.9 ug/g is the geometric mean of LC50 values for permethrin from Amweg et al. (2005).

Guideline Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167516, Permethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43979

Pollutant:

Permethrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167516, Permethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350263

Pollutant:

Permethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Oxadiazon LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Oxadiazon. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA expected safe lifetime exposure limit in drinking water for Oxdiazon, calculated using the IRIS Reference Dose, is 35 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.005 mg/kg/day as the reference dose. Guideline Reference: IRIS Reference Summary (Various Pollutants) Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167513, Oxadiazon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104947 Pollutant: Oxadiazon LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Oxadiazon. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA expected safe lifetime exposure limit in drinking water for Oxdiazon, calculated using the IRIS Reference Dose, is 35 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.005 mg/kg/day as the reference dose. Guideline Reference: IRIS Reference Summary (Various Pollutants) Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167513, Oxadiazon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 350261 Pollutant: Oxadiazon LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Oxadiazon. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Oxadiazon is the USEPA Aquatic Life Benchmark of 0.88 ug/L for a fish (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 167513, Oxadiazon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 350193 Pollutant: Oxadiazon LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Oxadiazon. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Oxadiazon is the USEPA Aquatic Life Benchmark of 0.88 ug/L for a fish (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 167513, Oxadiazon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 350201 Pollutant: Oxadiazon LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Oxadiazon. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Oxadiazon is the USEPA Aquatic Life Benchmark of 0.88 ug/L for a fish (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP


DECISION ID	157598	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Phorate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 42855 has been replaced by LOE 350359 and LOE 42869 has been replaced by LOE 350360 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

109851

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Phorate.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124114

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Phorate, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)



DECISION ID	157574	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Oxamyl (Vydate)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157574, Oxamyl (Vydate)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104949

Pollutant:

Oxamyl (Vydate)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Oxamyl.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for Oxamyl incorporated by reference in the Water Quality Control Plan, North Coast Basin is 50 ug/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s)3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 157598, Phorate

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124116

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Phorate, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

109848

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157574, Oxamyl (Vydate)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326059

Pollutant:

Oxamyl (Vydate)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Oxamyl.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for oxamyl is the USEPA Aquatic Life Benchmark of 27 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157574, Oxamyl (Vydate)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326068

Pollutant:

Oxamyl (Vydate)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Oxamyl.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for oxamyl is the USEPA Aquatic Life Benchmark of 27 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157574, Oxamyl (Vydate)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326060

Pollutant:

Oxamyl (Vydate)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Oxamyl.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for Oxamyl incorporated by reference in the Water Quality Control Plan, North Coast Basin is 50 ug/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

op" width="33%">Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Phorate. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

DECISION ID

167514

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Oxychlordane
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167514, Oxychlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124089

Pollutant:

Oxychlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Oxychlordane, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Aion_1/2011/ref3676.pdf" >Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

109850

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Phorate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157598, Phorate

Region 1

Russian River HU, Middlerticle 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167514, Oxychlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124091

Pollutant:

Oxychlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Oxychlordane, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167514, Oxychlordane	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124090

Pollutant:

Oxychlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Oxychlordane, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Russian River HA, Geyserville HSA

LOE ID: 104989 Pollutant: Phorate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Phorate. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 109846 Pollutant: Phorate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Phorate. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterio


DECISION ID	157578	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	PCBs (Polychlorinated biphenyls)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

n Reference:

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

25473

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

2150

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104984

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Phorate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157598, Phorate

Region 1

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Per the "Public Health Goal for Water Soluble Polychlorinated Biphenyls Expected to Found in Drinking Water" (OEHHA 2007): The health-protective concentration of water-soluble PCBs in
drinking water associated with a one in one million extra lifetime cancer risk is 0.09 ug/L.

Guideline Reference:

Spatial Representation:

Samples were collected from the mainstem Russian River at 6 locations as follows: (1) at Cloverdale (SWAMP Station ID 114RRCLO1), (2) downstream of the Cloverdale Water Treatment Plant (SWAMP Station ID 114CLOSTP), and (3) at Healdsburg Memorial Beach (SWAMP Station ID 114RRHMB1). Samples were collected from well-mixed flows in glides or riffles.

Temporal Representation:

At the Cloverdale and Healdsburg Memorial Beach sites, samples were collected over 22 site visits at each site from June 2001 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104981

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for PCBs (Polychlorinated biphenyls).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The total PCB Congeners criterion for the protection of human health from consumption of organisms only is 0.00017 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Sta: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326390

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Phorate.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The National Academy of Sciences no-adverse effect level in drinking water for phorate is 0.7 ug/L.

Guideline Reference:

National Academy of Sciences - Volume I Drinking Water and Health

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326396

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Phorate.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free ndard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326342

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Shellfish Harvesting

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The PCB criterion for the protection of human health from consumption of water and organisms is 0.00017 ug/L and is equal to the maximum of the sum of aroclors or congeners (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326337

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326403

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Phorate.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350360

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350359

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

align="top" width="33%">Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for PCBs (Polychlorinated biphenyls). Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The PCB criterion for the protection of human health from consumption of water and organisms is 0.00017 ug/L and is equal to the maximum of the sum of aroclors or congeners (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

DECISION ID

157605

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Phosmet
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 109857 has been replaced by LOE 350453, LOE 111625 has been replaced by LOE 350442, LOE 42911 has been replaced by LOE 350505, LOE 1019855 has been replaced by LOE 350410, LOE 104991 has been replaced by LOE 350441, LOE 42949 has been replaced by LOE 350462, LOE 109858 has been replaced by LOE 350444, and LOE 109856 has been replaced by LOE 350372 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124127

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Phosmet, Total. Ten sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Ten samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322714

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of 3 samples exceeded the water quality threshold for PCBs (Polychlorinated biphenyls). Monitors collected 3 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish, 1 composite of Sacramento Sucker composed of 10 fish, and 1 composite of Smallmouth Bass composed of 6 fish. Because no composites were collected within the same averaging period, these composites represent 3 independent samples.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science guidelines (NAS 1972) establish a maximum total PCB Arochlor concentration of 500 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)

Region 1

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124128

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA5 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Phosmet, Total. Two samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA5 was collected at 1 monitoring s PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322730

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of 3 samples exceeded the water quality threshold for PCBs (Polychlorinated biphenyls). Monitors collected 3 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish, 1 composite of Sacramento Sucker composed of 10 fish, and 1 composite of Smallmouth Bass composed of 6 fish. Because no composites were collected within the same averaging period, these composites represent 3 independent samples.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

109845

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quaite [ Russian River at Alexander Valley Bridge - 114RR4234]

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350441

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Phosmet.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350442

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The total PCB Congeners criterion for the protection of human health from consumption of water and organisms is 0.00017 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104980

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for PCBs (Polychlorinated biphenyls).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The total PCB Congeners criterion for the protection of human health from consumption of water and organisms is 0.00017 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

103771

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for PCBs (Polychlorinated biphenyls).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The total PCB Congeners criterion for the protection of human health from consumption of water and organisms is 0.00017 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

46521

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

The method detection limit for all 24 of the samples was greater than the criteria: thus the data was not used in this assessment. All of the 24 samples were either measured as non-detect or were measured as detected but not quantified with reporting limits below objectives or evaluation guidelines. Each of the 24 samples were analyzed for 50 PCB cogeners. The samples were collected as part of the Surface Water Ambient Water Monitoritr>

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Phosmet.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350444

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Phosmet.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350372

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Phosmet.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350505

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Revised Draft of the 2007 Review of the Monitoring Data for the Irrigated Lands Regulatory Conditional Waiver Program

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33363

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

The method detection limit for all 3 of the non-detect samples was greater than the criteria: thus the data was not used in this assessment.

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The total PCB criterion for the protection of human health from the consumption of water and organisms is 0.00017 ug/L. This value corresponds to total PCBs, eg., the sum of all congener or isomer or homolog or aroclor analyses (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples were collected on 11/26/2007, 4/7/2008, and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33228

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Zero of 1 sample collected for Total PCBs exceeded the evaluation guideline.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for total PCB is 676 ug/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected at the following station 114RRAXRV (Russian River at Alexander RV Park).

Temporal Representation:

The samples were collected on 10/14/2008.

Environmental Conditions:

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33340

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350453

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Phosmet.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124126

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Phosmet, Total. Forty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The total PCB criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.014 ug/L. This value corresponds to the sum of aroclors 1242, 1254, 1221, 1232, 1248, 1260, and 1016 (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples collected on 4/7/2008 and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

109840

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for PCBs (Polychlorinated biphenyls).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The total PCB Congeners criterion for the protection of human health from consumption of organisms only is 0.00017 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111614

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for PCBs (Polychlorinated biphenyls).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The total PCB Congeners criterion for the protection of human health from consumption of organisms only is 0.00017 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157578, PCBs (Polychlorinated biphenyls)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322727

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of 3 samples exceeded the water quality threshold for PCBs (Polychlorinated biphenyls). Monitors collected 3 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish, 1 composite of Sacramento Sucker composed of 10 fish, and 1 composite of Smallmouth Bass composed of 6 fish. Because no composites were collected within the same averaging period, these composites represent 3 independent samples.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

colspan="2"> LOE ID: 123937 Pollutant: Phosmet LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Phosmet, Total. Forty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 350462 Pollutant: Phosmet LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Phosmet. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2007-11-26 and 2008-07-14 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326413 Pollutant: Phosmet LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Phosmet. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s):

DECISION ID

157576

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Parathion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157576, Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

113319

Pollutant:

Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life Criterion Continuous Concentration (expressed as a 4 Day average) for parathion is 0.013 µg/L.

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157576, Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

113318

Pollutant:

Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life Criterion Continuous Concentration (expressed as a 4 Day average) for parathion is 0.013 µg/L.

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157576, Parathion

SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326411

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Phosmet.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326419

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Phosmet.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Based on USEPA IRIS reference dose (RfD) as a drinking water level, the drinking water health advisory level for phosmet is 140 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, and 20% relative source contribution from drinking water. An additional uncertainty factor of 10 is used for Class C carcinogens.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350410

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Phosmet.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

DING-BOTTOM: 3px; WIDTH: 100%; text-align: right; PADDING-TOP: 3px; font-smooth: always">Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 43059 Pollutant: Parathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA national ambient water quality criterion for freshwater aquatic life 4-hour maximum for parathion is 0.013 µg/L. Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157576, Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 43105 Pollutant: Parathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP


DECISION ID	157577	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Polybrominated Diphenyl Ethers (PBDEs)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157577, Polybrominated Diphenyl Ethers (PBDEs)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322737

Pollutant:

Polybrominated Diphenyl Ethers (PBDEs)

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of 3 samples exceeded the water quality threshold for Polybrominated Diphenyl Ethers (PBDEs). Monitors collected 5 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish, 3 composites of Sacramento Sucker composed of 10 fish each, and 1 composite of Smallmouth Bass composed of 6 fish. Because 2 or more composites were collected within the same averaging period, these composites resulted in 3 independent samples.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The modified OEHHA Fish Contaminant Goal for polybrominated diphenyl ethers (PBDEs) in fish tissue is 220 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008)

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Polybrominated Diphenyl Ethers (PBDEs)

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA national ambient water quality criterion for freshwater aquatic life 4-hour maximum for parathion is 0.013 µg/L. Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157576, Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 114033 Pollutant: Parathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Parathion, Ethyl. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA national ambient water quality criterion for freshwater aquatic life Criterion Continuous Concentration (expressed as a 4 Day average) for parathion is 0.013 µg/L. Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114BS0310). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157576, Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326311 Pollutant: Parathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Parathion, Ethyl. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA national ambient water quality criterion for freshwater aquatic life Criterion Continuous Concentration (expressed as a 4 Day average) for parathion is 0.013 ug/L. Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157576, Parathion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326310 Pollutant: Parathion LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Parathion, Ethyl. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA recommended freshwater aquatic life ambient water quality chronic criteria for parathion is 0.013 ug/L. Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP


DECISION ID	157579	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Prometon (Prometone)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 42901 has been replaced by LOE 350524 and LOE 42951 has been replaced by LOE 350514 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104996

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Prometon.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Prometon is the USEPA Aquatic Life Benchmark of 98 ug/L for a nonvascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104998

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Prometon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Prometon is the USEPA Aquatic Life Benchmark of 98 ug/L for a nonvascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104999

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Prometon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Prometon is the USEPA Aquatic Life Benchmark of 98 ug/L for a nonvascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123949

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Prometon, Total. Ten sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): No individual pesticide or


DECISION ID	167516	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Permethrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167516, Permethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350267

Pollutant:

Permethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167516, Permethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43980

Pollutant:

Permethrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167516, Permethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43979

Pollutant:

Permethrin

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167516, Permethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350263

Pollutant:

Permethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan.

Objective/Criterion Reference:

Evaluation Guideline:

According to the 2006 USEPA Drinking Water Standards and Health Advisories, the Life-time Exposure Health Advisory for Prometon (Prometone) is 0.1 mg/L. (EPA 822-R-06-013, 2006)

Guideline Reference:

2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105001

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Prometon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Prometon is the USEPA Aquatic Life Benchmark of 98 ug/L for a nonvascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123938

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Prometon, Total. Twenty-eight sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the 2006 USEPA Drinking Water Standards and Health Advisories, the Life-time Exposure Health Advisory for Prometon (Prometone) is 0.1 mg/L. (EPA 822-R-06-013, 2006)

Guideline Reference:

2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 6/26/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350514

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for prometon (prometone) is the USEPA Aquatic Life Benchmark of 98 ug/L for a nonvascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350524

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:


DECISION ID	157598	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Phorate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 42855 has been replaced by LOE 350359 and LOE 42869 has been replaced by LOE 350360 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

109851

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Phorate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic).

The evaluation guideline for prometon (prometone) is the USEPA Aquatic Life Benchmark of 98 ug/L for a nonvascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326437

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Prometon.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for prometon (prometone) is the USEPA Aquatic Life Benchmark of 98 ug/L for a nonvascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326436

Pollutant:

Prometon (Prometone)

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124114

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Phorate, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Prometon.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for 10 day exposure of a 10 kg-Child to Prometon as a drinking water level is a concentration of 0.02 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326427

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Prometon.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guid3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 157598, Phorate

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124116

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Phorate, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

109848

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

The evaluation guideline for prometon (prometone) is the USEPA Aquatic Life Benchmark of 98 ug/L for a nonvascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123939

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Prometon, Total. Twenty-eight sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the 2006 USEPA Drinking Water Standards and Health Advisories, the Life-time Exposure Health Advisory for Prometon (Prometone) is 0.1 mg/L. (EPA 822-R-06-013, 2006)

Guideline Reference:

2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/26/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105002

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Prometon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Prometon is the USEPA Aquatic Life Benchmark of 98 ug/L for a nonvascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105000

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Prometon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Prometon is the USEPA Aquatic Life Benchmark of 98 ug/L for a nonvascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124115 Pollutant: Phorate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Phorate, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 109850 Pollutant: Phorate LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Phorate. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157598, Phorate

Region 1

Russian River HU, Middle


DECISION ID	157594	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Prometryn
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 105006 has been replaced by LOE 350614, LOE 42903 has been replaced by LOE 350692, LOE 105010 has been replaced by LOE 350695, LOE 105003 has been replaced by LOE 350574, LOE 105012 has been replaced by LOE 350616, LOE 42941 has been replaced by LOE 350654, LOE 105005 has been replaced by LOE 350621, and LOE 105009 has been replaced by LOE 350544 due to a reassessment of data using the UC Davis Aquatic Life Criterion threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350695

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Prometryn.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

LOE ID:

104989

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Phorate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

109846

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Phorate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterio>

Evaluation Guideline:

UC Davis Aquatic Life Criteria: Aquatic life should not be affected unacceptably if the four-day average concentration of Prometryn does not exceed 0.562 ug/L in the water column more than once every three years on average (Bower, et al. 2017).

Guideline Reference:

Water Quality Criteria Report for Prometryn Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350614

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Prometryn.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Prometryn Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157594, Prometryn

Region 1

Evaluation Guideline:

The evaluation guideline for Phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104984

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Phorate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326390

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Phorate.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The National Academy of Sciences no-adverse effect level in drinking water for phorate is 0.7 ug/L.

Guideline Reference:

National Academy of Sciences - Volume I Drinking Water and Health

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326396

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Phorate.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free CCCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350544

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Prometryn.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Prometryn Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350574

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Prometryn.

Data Reference:

SWAMP Data:

SWAMP

Water of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326403

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Phorate.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350360

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157598, Phorate	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350359

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: UC Davis Aquatic Life Criteria: Aquatic life should not be affected unacceptably if the four-day average concentration of Prometryn does not exceed 0.562 ug/L in the water column more than once every three years on average (Bower, et al. 2017). Guideline Reference: Water Quality Criteria Report for Prometryn Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis. Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 350621 Pollutant: Prometryn LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Prometryn. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: UC Davis Aquatic Life Criteria: Aquatic life should not be affected unacceptably if the four-day average concentration of Prometryn does not exceed 0.562 ug/L in the water column more than once every three years on average (Bower, et al. 2017). Guideline Reference: Water Quality Criteria Report for Prometryn Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis. Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 350692 Pollutant: Prometryn LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Prometryn. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: UC Davis Aquatic Life Criteria: Aquatic life should not be affected unacceptably if the four-day average concentration of Prometryn does not exceed 0.562 ug/L in the water column more than once every three years on average (Bower, et al. 2017). Guideline Reference: Water Quality Criteria Report for Prometryn Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis. Spatial Representation: The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2007-11-26 and 2008-07-14 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 105004 Pollutant: Prometryn LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Prometryn. Data Refe


DECISION ID	157605	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Phosmet
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 109857 has been replaced by LOE 350453, LOE 111625 has been replaced by LOE 350442, LOE 42911 has been replaced by LOE 350505, LOE 1019855 has been replaced by LOE 350410, LOE 104991 has been replaced by LOE 350441, LOE 42949 has been replaced by LOE 350462, LOE 109858 has been replaced by LOE 350444, and LOE 109856 has been replaced by LOE 350372 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124127

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Phosmet, Total. Ten sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Ten samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA expected safe lifetime exposure limit in drinking water for Prometryn, calculated using the IRIS Reference Dose, is 28 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.004 mg/kg/day as the reference dose.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350654

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Prometryn Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124128

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA5 was collected at 1 monitoring sdth="33%">QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326449

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Prometryn.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Prometryn Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326450

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350441

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Phosmet.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350442

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Prometryn.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Prometryn Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326441

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Prometryn.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

IRIS Reference Summary (Varioustr>

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Phosmet.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350444

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Phosmet.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105007

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Prometryn.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105011

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Prometryn.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350616

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Prometryn.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Prometryn Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

"left" valign="top" width="67%">The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 350372 Pollutant: Phosmet LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Phosmet. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 350505 Pollutant: Phosmet LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Phosmet. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2007-11-26 and 2008-07-14 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 350453 Pollutant: Phosmet LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Phosmet. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30

DECISION ID

157608

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Propazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 43298 has been replaced by LOE 350718 and LOE 43346 has been replaced by LOE 350708 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

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Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105018

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Propazine.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Propazine is the USEPA Aquatic Life Benchmark of 24.8 ug/L for a nonvascular plant (acp" width="33%">Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124126

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Phosmet, Total. Forty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326467

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Propazine.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for propazine is the USEPA Aquatic Life Benchmark of 24.8 ug/L for a nonvascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326475

Pollutant:

Propazine

LOE Subgroup:

LOE ID:

123937

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Phosmet, Total. Forty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350462

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board st

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Propazine.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA health advisory for one-in-a-million incremental cancer risk estimate calculated as a drinking water standard for propazine is 100 ug/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326473

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Propazine.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guidelinaff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Phosmet.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326413

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Phosmet.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350718

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for propazine is the USEPA Aquatic Life Benchmark of 24.8 ug/L for a nonvascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350708

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for propazine is the USEPA Aquatic Life Benchmark of 24.8 ug/L for a nonvascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

109880

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Propazine.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA health advisory for one-in-a-million incremental cancer risk estimate calculated as a drinking water standard for propazine is 100 µg/L.

Guideline Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326411

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Phosmet.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326419

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Phosmet.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157605, Phosmet	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350410

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Phosmet.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1


DECISION ID	157577	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Polybrominated Diphenyl Ethers (PBDEs)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157577, Polybrominated Diphenyl Ethers (PBDEs)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

322737

Pollutant:

Polybrominated Diphenyl Ethers (PBDEs)

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and the results are as follows: 0 of 3 samples exceeded the water quality threshold for Polybrominated Diphenyl Ethers (PBDEs). Monitors collected 5 composites: 1 composite of Sacramento Pikeminnow composed of 10 fish, 3 composites of Sacramento Sucker composed of 10 fish each, and 1 composite of Smallmouth Bass composed of 6 fish. Because 2 or more composites were collected within the same averaging period, these composites resulted in 3 independent samples.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Polybrominated Diphenyl Ethers (PBDEs)

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 114RR5568 (Russian River Downstream of Cloverdale STP).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

" >2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 105020 Pollutant: Propazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Propazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Propazine is the USEPA Aquatic Life Benchmark of 24.8 ug/L for a nonvascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 105015 Pollutant: Propazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Propazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Propazine is the USEPA Aquatic Life Benchmark of 24.8 ug/L for a nonvascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 123962 Pollutant: Propazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Propazine, Total. Five sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: According to the 2006 USEPA Drinking Water Standards and Health Advisories, the Life-time Exposure Health Advisory for Propazine is 0.1 mg/L. (EPA 822-R-06-013, 2006) Guideline Reference: 2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013 Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 105016 Pollutant: Propazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Propazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Propazine is the USEPA Aquatic Life Benchmark of 24.8 ug/L for a nonvascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

DECISION ID

157579

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Prometon (Prometone)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 42901 has been replaced by LOE 350524 and LOE 42951 has been replaced by LOE 350514 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104996

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Prometon.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Prometon is the USEPA Aquatic Life Benchmark of 98 ug/r>

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105013

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Propazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Propazine is the USEPA Aquatic Life Benchmark of 24.8 ug/L for a nonvascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105021

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Propazine.

Data RefL for a nonvascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104998

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Prometon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Prometon is the USEPA Aquatic Life Benchmark of 98 ug/L for a nonvascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104999

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Prometon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Prometon is the USEPA Aquatic Life Benchmark of 98 ug/L for a nonvascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123949

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Prometon, Total. Ten sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): No individual pesticide or erence:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA health advisory for one-in-a-million incremental cancer risk estimate calculated as a drinking water standard for propazine is 100 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123951

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Propazine, Total. Fourteen sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the 2006 USEPA Drinking Water Standards and Health Advisories, the Life-time Exposure Health Advisory for Propazine is 0.1 mg/L. (EPA 822-R-06-013, 2006)

Guideline Reference:

2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/26/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105022

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Propazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Propazine is the USEPA Aquatic Life Benchmark of 24.8 ug/L for a nonvascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123950

Pollutant:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the 2006 USEPA Drinking Water Standards and Health Advisories, the Life-time Exposure Health Advisory for Prometon (Prometone) is 0.1 mg/L. (EPA 822-R-06-013, 2006)

Guideline Reference:

2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105001

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Prometon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Prometon is the USEPA Aquatic Life Benchmark of 98 ug/L for a nonvascular plant (acute).

Guideline Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Propazine, Total. Fourteen sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the 2006 USEPA Drinking Water Standards and Health Advisories, the Life-time Exposure Health Advisory for Propazine is 0.1 mg/L. (EPA 822-R-06-013, 2006)

Guideline Reference:

2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 6/26/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105014

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Propazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA health advisory for one-in-a-million incremental cancer risk estimate calculated as a drinking water standard for propazine is 100 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

t" valign="top" width="67%">Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 123938 Pollutant: Prometon (Prometone) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Prometon, Total. Twenty-eight sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: According to the 2006 USEPA Drinking Water Standards and Health Advisories, the Life-time Exposure Health Advisory for Prometon (Prometone) is 0.1 mg/L. (EPA 822-R-06-013, 2006) Guideline Reference: 2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013 Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 6/26/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 350514 Pollutant: Prometon (Prometone) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Prometon. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for prometon (prometone) is the USEPA Aquatic Life Benchmark of 98 ug/L for a nonvascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2007-11-26 and 2008-07-14 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 350524 Pollutant: Prometon (Prometone) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Prometon. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: <


DECISION ID	157620	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Pyrethrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 105023 has been replaced by LOE 350761 and LOE 105024 has been replaced by LOE 350748 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157620, Pyrethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350761

Pollutant:

Pyrethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Pyrethrin.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for pyrethrin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrtd align="left" valign="top" width="67%">The evaluation guideline for prometon (prometone) is the USEPA Aquatic Life Benchmark of 98 ug/L for a nonvascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326437

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Prometon.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for prometon (prometone) is the USEPA Aquatic Life Benchmark of 98 ug/L for a nonvascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326436

Pollutant:

Prometon (Prometone)

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157620, Pyrethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326500

Pollutant:

Pyrethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Pyrethrin.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for pyrethrin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of pyrethrin-1 and pyrethrin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157620, Pyrethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326501

Pollutant:

Pyrethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Pyrethrin.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for pyrethrin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of pyrethrin-1 and pyrethrin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157620, Pyrethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350748

Pollutant:

Pyrethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Pyrethrin.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for pyrethrin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of pyrethrin-1 and pyrethrin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

> LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Prometon. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA Health Advisory for 10 day exposure of a 10 kg-Child to Prometon as a drinking water level is a concentration of 0.02 mg/L. Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326427 Pollutant: Prometon (Prometone) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Prometon. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for prometon (prometone) is the USEPA Aquatic Life Benchmark of 98 ug/L for a nonvascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 123939 Pollutant: Prometon (Prometone) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Prometon, Total. Twenty-eight sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: According to the 2006 USEPA Drinking Water Standards and Health Advisories, the Life-time Exposure Health Advisory for Prometon (Prometone) is 0.1 mg/L. (EPA 822-R-06-013, 2006) Guideline Reference: 2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013 Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 6/26/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 105002 Pollutant: Prometon (Prometone) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Prometon. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Prometon is the USEPA Aquatic Life Benchmark of 98 ug/L for a nonvascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157579, Prometon (Prometone)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 105000 Pollutant: Prometon (Prometone) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Prometon. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Prometon is the USEPA Aquatic Life Benchmark of 98 ug/L for a nonvascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	157539	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Pyrethrins
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157539, Pyrethrins	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350848

Pollutant:

Pyrethrins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Pyrethrins.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for pyrethrins is the USEPA Aquatic Life Benchmark of 0.04 ug/L for an invertebrate (chronic), and is the sum of cinerin-1, cinerin-2, jasmolin-1, jasmolin-2, pyrethrin-1, and pyrethrin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157539, Pyrethrins	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326505

Pollutant:

Pyrethrins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Pyrethrins.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157539, Pyrethrins	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326503

Pollutant:

Pyrethrins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Pyrethrins.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157539, Pyrethrins	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350865

Pollutant:

Pyrethrins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Pyrethrins.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .


DECISION ID	157594	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Prometryn
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 105006 has been replaced by LOE 350614, LOE 42903 has been replaced by LOE 350692, LOE 105010 has been replaced by LOE 350695, LOE 105003 has been replaced by LOE 350574, LOE 105012 has been replaced by LOE 350616, LOE 42941 has been replaced by LOE 350654, LOE 105005 has been replaced by LOE 350621, and LOE 105009 has been replaced by LOE 350544 due to a reassessment of data using the UC Davis Aquatic Life Criterion threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350695

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Prometryn.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

DECISION ID

169801

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Pyrethroids
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 169801, Pyrethroids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350910

Pollutant:

Pyrethroids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The summed ratios of the pyrethroid pesticides bifenthrin, cyfluthrin, cypermethrin, esfenvalerate, lambda-cyhalothrin, permethrin and their respective chronic concentration goals are not to exceed 1. If the freely dissolved concentrations of these pesticides were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.

Guideline Reference:

Amendment to the Water Quality Control Plan for the Sacramento River and San Joaquin River Basins for the Control of Pyrethroid Pesticide Discharges

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 169801, Pyrethroids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350921

Pollutant:

Pyrethroids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Amendment to the Water Quality Control Plan for the Sacramento River and San Joaquin River Basins for the Control of Pyrethroid Pesticide Discharges

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

> Evaluation Guideline: UC Davis Aquatic Life Criteria: Aquatic life should not be affected unacceptably if the four-day average concentration of Prometryn does not exceed 0.562 ug/L in the water column more than once every three years on average (Bower, et al. 2017). Guideline Reference: Water Quality Criteria Report for Prometryn Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis. Spatial Representation: The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 350614 Pollutant: Prometryn LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Prometryn. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: UC Davis Aquatic Life Criteria: Aquatic life should not be affected unacceptably if the four-day average concentration of Prometryn does not exceed 0.562 ug/L in the water column more than once every three years on average (Bower, et al. 2017). Guideline Reference: Water Quality Criteria Report for Prometryn Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis. Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1


DECISION ID	157550	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Saxitoxins
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157550, Saxitoxins	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326518

Pollutant:

Saxitoxins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 9 samples exceeded the water quality threshold for Saxitoxins.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for saxitoxins for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.3 ug/L.

Guideline Reference:

Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2017-06-15 and 2017-10-17

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

CCCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA LOE ID: 350544 Pollutant: Prometryn LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Prometryn. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: UC Davis Aquatic Life Criteria: Aquatic life should not be affected unacceptably if the four-day average concentration of Prometryn does not exceed 0.562 ug/L in the water column more than once every three years on average (Bower, et al. 2017). Guideline Reference: Water Quality Criteria Report for Prometryn Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis. Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 350574 Pollutant: Prometryn LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Prometryn. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water


DECISION ID	167517	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Secbumeton
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167517, Secbumeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123975

Pollutant:

Secbumeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Secbumeton, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167517, Secbumeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123964

Pollutant:

Secbumeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Secbumeton, Total. Fourteen samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 6/26/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167517, Secbumeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123963

Pollutant:

Secbumeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Secbumeton, Total. Fourteen samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/26/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA


DECISION ID	157580	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Selenium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Thirty lines of evidence are available in the administrative record to assess this pollutant. Five out of sixty nine samples exceed the objective for the MUN beneficial use(s). Two of the six exceedances are split between one station(s) over a four day period (6/21/2001 - 6/25/2001) and have been averaged to a single exceedances because they are not temporally independent and represent a single event. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Six out of seventy-one samples exceed the objective for the MUN beneficial use(s). . and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. Two of the six exceedances are split between one station(s) over a four day period (6/21/2001 - 6/25/2001) and have been averaged to a single exceedances. This averaging represents the single event with which the exceedances are related 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123978

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 23 samples exceed the criterion for Selenium, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/21/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105028

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standrence:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350654

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Prometryn Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111661

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43371

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board dth="33%">QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326449

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Prometryn.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Prometryn Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326450

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123989

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 23 samples exceed the criterion for Selenium, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Represenr>

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Prometryn.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Prometryn Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326441

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Prometryn.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

IRIS Reference Summary (Varioustation:

Data was collected over the time period 6/22/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123977

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 2 samples exceed the criterion for Selenium, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Comminski Station - 114RRCOMM]

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157580, Selenium

Region 1

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105007

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Prometryn.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105011

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Prometryn.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157594, Prometryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350616

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Prometryn.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Prometryn Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

DTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 123976 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Selenium, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 105025 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 6 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Selenium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-09-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 105027 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 6 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Selenium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-09-28 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Inf


DECISION ID	157608	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Propazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 43298 has been replaced by LOE 350718 and LOE 43346 has been replaced by LOE 350708 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

ormation Reference(s):h="67%">Propazine

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105018

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Propazine.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Propazine is the USEPA Aquatic Life Benchmark of 24.8 ug/L for a nonvascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326467

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Propazine.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for propazine is the USEPA Aquatic Life Benchmark of 24.8 ug/L for a nonvascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326475

Pollutant:

Propazine

LOE Subgroup:

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328985

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328971

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328970

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Propazine.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA health advisory for one-in-a-million incremental cancer risk estimate calculated as a drinking water standard for propazine is 100 ug/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326473

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Propazine.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for propazine is the USEPA Aquatic Life Benchmark of 24.8 ug/L for a nonvascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350718

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for propazine is the USEPA Aquatic Life Benchmark of 24.8 ug/L for a nonvascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350708

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for propazine is the USEPA Aquatic Life Benchmark of 24.8 ug/L for a nonvascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

109880

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Propazine.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA health advisory for one-in-a-million incremental cancer risk estimate calculated as a drinking water standard for propazine is 100 µg/L.

Guideline Reference:

Line of Evidence (LOE) for Decision ID 157580, Selenium

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326605

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Selenium.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326541

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Selenium.

Data Reference:

SWAMP Data:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105020

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Propazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Propazine is the USEPA Aquatic Life Benchmark of 24.8 ug/L for a nonvascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105015

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

SWAMP

Water Quality Objective/Criterion:

The selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326611

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Selenium.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Region 1

Line of Evidence (LOE) for Decision ID 157580, Selenium

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Propazine.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Propazine is the USEPA Aquatic Life Benchmark of 24.8 ug/L for a nonvascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123962

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Propazine, Total. Five sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the 2006 USEPA Drinking Water Standards and Health Advisories, the Life-time Exposure Health Advisory for Propazine is 0.1 mg/L. (EPA 822-R-06-013, 2006)

Guideline Reference:

2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105016

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Propazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Propazine is the USEPA Aquatic Life Benchmark of 24.8 ug/L for a nonvascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326563

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Selenium.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326558

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Selenium.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326560

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Selenium.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157580, Selenium

Region 1

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105013

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Propazine.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Propazine is the USEPA Aquatic Life Benchmark of 24.8 ug/L for a nonvascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105021

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Propazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA health advisory for one-in-a-million incremental cancer risk estimate calculated as a drinking water standard for propazine is 100 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123951

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Propazine, Total. Fourteen sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the 2006 USEPA Drinking Water Standards and Health Advisories, the Life-time Exposure Health Advisory for Propazine is 0.1 mg/L. (EPA 822-R-06-013, 2006)

Guideline Reference:

2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013

-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326606

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Selenium.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326593

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Selenium.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Water Qual

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/26/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105022

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Propazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Propazine is the USEPA Aquatic Life Benchmark of 24.8 ug/L for a nonvascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123950

Pollutant:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328978

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328981

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Propazine, Total. Fourteen sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the 2006 USEPA Drinking Water Standards and Health Advisories, the Life-time Exposure Health Advisory for Propazine is 0.1 mg/L. (EPA 822-R-06-013, 2006)

Guideline Reference:

2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 6/26/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157608, Propazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105014

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Propazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA health advisory for one-in-a-million incremental cancer risk estimate calculated as a drinking water standard for propazine is 100 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Selenium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328989 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Selenium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328969 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Selenium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2017-06-11 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328993 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat

DECISION ID

157620

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Pyrethrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 105023 has been replaced by LOE 350761 and LOE 105024 has been replaced by LOE 350748 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157620, Pyrethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350761

Pollutant:

Pyrethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Pyrethrin.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for pyrethrin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of pyrethrin-1 and pyrethrin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157620, Pyrethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326500

Pollutant:

Pyrethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Pyrethrin.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for pyrethrin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of pyrethrin-1 and pyrethrin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157620, Pyrethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326501

Pollutant:

Pyrethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Pyrethrin.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for pyrethrin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of pyrethrin-1 and pyrethrin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157620, Pyrethrin	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350748

Pollutant:

Pyrethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Pyrethrin.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for pyrethrin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of pyrethrin-1 and pyrethrin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

="top" width="33%">Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Selenium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326617 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Selenium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326612 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Selenium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328988 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Selenium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326551 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Selenium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326569 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Selenium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP


DECISION ID	157539	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Pyrethrins
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157539, Pyrethrins	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350848

Pollutant:

Pyrethrins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Pyrethrins.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157539, Pyrethrins	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326505

Pollutant:

Pyrethrins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Pyrethrins.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157539, Pyrethrins	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326503

Pollutant:

Pyrethrins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Pyrethrins.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157539, Pyrethrins	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350865

Pollutant:

Pyrethrins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Pyrethrins.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1


DECISION ID	157581	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Silver
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326645

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Silver.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The dissolved silver criterion maximum concentration (CMC) to protect aquatic life in freshwater is hardnesss dependent. The criterion when calculated using a default hardness of 100 mg/L is 3.4 ug/L. This criterion was divided by 2 in order to better represent a CMC value as specified in footnote (g) of Table (b)(1) of the California Toxics Rule, 2000.

Objective/Criterion Reference:

DECISION ID

169801

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Pyrethroids
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 169801, Pyrethroids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350910

Pollutant:

Pyrethroids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Amendment to the Water Quality Control Plan for the Sacramento River and San Joaquin River Basins for the Control of Pyrethroid Pesticide Discharges

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 169801, Pyrethroids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350921

Pollutant:

Pyrethroids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Amendment to the Water Quality Control Plan for the Sacramento River and San Joaquin River Basins for the Control of Pyrethroid Pesticide Discharges

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

top" width="67%">Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326691 Pollutant: Silver LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Silver. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The dissolved silver criterion maximum concentration (CMC) to protect aquatic life in freshwater is hardnesss dependent. The criterion when calculated using a default hardness of 100 mg/L is 3.4 ug/L. This criterion was divided by 2 in order to better represent a CMC value as specified in footnote (g) of Table (b)(1) of the California Toxics Rule, 2000. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326624 <


DECISION ID	157550	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Saxitoxins
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157550, Saxitoxins	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326518

Pollutant:

Saxitoxins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 9 samples exceeded the water quality threshold for Saxitoxins.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for saxitoxins for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.3 ug/L.

Guideline Reference:

Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2017-06-15 and 2017-10-17

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

td> Pollutant: Silver LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Silver. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The dissolved silver criterion maximum concentration (CMC) to protect aquatic life in freshwater is hardnesss dependent. The criterion when calculated using a default hardness of 100 mg/L is 3.4 ug/L. This criterion was divided by 2 in order to better represent a CMC value as specified in footnote (g) of Table (b)(1) of the California Toxics Rule, 2000. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326653 Pollutant: Silver LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Silver. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for silver is 0.1 mg/L. Objective/Criterion Reference:

DECISION ID

167517

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Secbumeton
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167517, Secbumeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123975

Pollutant:

Secbumeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Secbumeton, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, oards.ca.gov/water_issues/programs/tmdl/records/region_1/2018/ref4527.pdf" >Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326675

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Silver.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123990

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167517, Secbumeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123964

Pollutant:

Secbumeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Secbumeton, Total. Fourteen samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 6/26/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167517, Secbumeton	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123963

Pollutant:

Secbumeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Secbumeton, Total. Fourteen samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/26/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

width="67%">Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Silver, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for silver is 0.1 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449. Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA


DECISION ID	157580	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Selenium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Thirty lines of evidence are available in the administrative record to assess this pollutant. Five out of sixty nine samples exceed the objective for the MUN beneficial use(s). Two of the six exceedances are split between one station(s) over a four day period (6/21/2001 - 6/25/2001) and have been averaged to a single exceedances because they are not temporally independent and represent a single event. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Six out of seventy-one samples exceed the objective for the MUN beneficial use(s). . and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. Two of the six exceedances are split between one station(s) over a four day period (6/21/2001 - 6/25/2001) and have been averaged to a single exceedances. This averaging represents the single event with which the exceedances are related 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

PHYSICAL/CHEMICAL MONITORING

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123978

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 23 samples exceed the criterion for Selenium, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114460

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123991

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceed the criterion for Silver, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Comminski Station - 114RRCOMM]

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114459

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Silver.

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/21/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105028

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111661

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43371

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board " width="33%">Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123992

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 23 samples exceed the criterion for Silver, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/21/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33676

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for silver.

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples collected between 11/26/2007 and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33125

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123989

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 23 samples exceed the criterion for Selenium, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Represen>

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for silver.

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples collected between 11/26/2007 and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

109895

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

California Toxics Rule (CTR) lists criterion maximum concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Data was collected over the time period 6/22/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123977

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 2 samples exceed the criterion for Selenium, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Comminski Station - 114RRCOMM]

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157580, Selenium

Region 1

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114458

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

109896

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123976

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Selenium, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105025

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Selenium.

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

109892

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

Qtr>

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105027

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP InfAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326642

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Silver.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326689

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Silver.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124260

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 23 samples exceed the criterion for Silver, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 6/22/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326662

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Silver.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

ormation Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328985 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Selenium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328971 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Selenium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2017-06-11 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328970 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Selenium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle



DECISION ID	157582	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Simazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 120906 has been replaced by LOE 351033, LOE 114468 has been replaced by LOE 350952, LOE 114464 has been replaced by LOE 351070, LOE 43156 has been replaced by LOE 350974, LOE 114461 has been replaced by LOE 351059, LOE 120895 has been replaced by LOE 350985, LOE 114463 has been replaced by LOE 351073, LOE 114467 has been replaced by LOE 350996, LOE 114470 has been replaced by LOE 351009, and LOE 43404 has been replaced by LOE 350982 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Twenty-two lines of evidence are available in the administrative record to assess this pollutant. Two out of two samples exceed the objective for the MUN beneficial use(s). Two exceedances are split between one station(s) over a four day period (6/21/2001 - 6/25/2001) and have been averaged to a single exceedances because they are not temporally independent and represent a single event; therefore these two samples are being assessed as a single sample. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Two out of two samples exceed the objective for the MUN beneficial use(s). Two exceedances are split between one station(s) over a four day period (6/21/2001 - 6/25/2001) and have been averaged to a single exceedances because they are not temporally independent and represent a single event; therefore these two samples are being assessed as a single sample. This sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114462

Pollutant:

Simazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Datlor:#CCCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 157580, Selenium

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326605 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Selenium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326541 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Selenium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Simazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for simazine is 0.004 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 43360 Pollutant: Simazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Simazine. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for simazine is 0.004 mg/L. Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): SWAMP Water Quality Objective/Criterion: The selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326611 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Selenium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP 100%; text-align: right; PADDING-TOP: 3px; font-smooth: always">Region 1

Line of Evidence (LOE) for Decision ID 157580, Selenium

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114465

Pollutant:

Simazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Simazine.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326713

Pollutant:

Simazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Simazine.

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326563 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Selenium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326558 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Selenium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326708 Pollutant: Simazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Simazine. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): ign="left" valign="top" width="33%">Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326560 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Selenium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157580, Selenium

Region 1

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326710

Pollutant:

Simazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Simazine.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

350952

Pollutant:

Simazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Simazine.

Data Reference:

LOE ID: 326606 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Selenium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326593 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Selenium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Qualzip">Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 350985 Pollutant: Simazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed NWIS data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Simazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463682 (RUSSIAN R A JIMTOWN CA). Temporal Representation: The samples were collected between the dates of 2016-10-28 and 2016-10-28 Environmental Conditions: QAPP Information: Quality-Assurance Plan for Water Quality Activities of the California Water Science Center QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle GHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 157582, Simazine

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328978

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328981

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 351009 Pollutant: Simazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Simazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 350974 Pollutant: Simazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Simazine. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Selenium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328989 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Selenium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-1146315ign="top" width="67%">SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2007-11-26 and 2008-07-14 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 351059 Pollutant: Simazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Simazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157582, Simazine

Regio0 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328969

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328993

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 351073 Pollutant: Simazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Simazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 351033 Pollutant: Simazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed NWIS data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Simazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental ph="top" width="33%">Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Selenium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326617 Pollutant: Selenium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Selenium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463682 (RUSSIAN R A JIMTOWN CA). Temporal Representation: The samples were collected between the dates of 2016-10-28 and 2016-10-28 Environmental Conditions: QAPP Information: Quality-Assurance Plan for Water Quality Activities of the California Water Science Center QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 350996 Pollutant: Simazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Simazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157582, Simazine

Region 1

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326612

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Selenium.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328988

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

POM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 351070 Pollutant: Simazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Simazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 350982 Pollutant: Simazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Simazine. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Selenium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157580, Selenium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 120840 Pollutant: Simazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed NWIS data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Simazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for simazine is 0.004 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (USGS-11463682) Temporal Representation: The samples were collected between the dates of 2016-10-28 and 2016-10-28 Environmental Conditions: QAPP Information: QAPP not required for federal data QAPP Information Reference(s): This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124262 Pollutant: Simazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 2 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA5 to determine beneficial use support and results are as follows: 2 of 2 samples exceed the criterion for Simazine, Total. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for simazine is 0.004 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA5 was collected at 1 monitoring site [ Russian River at Alexander Valley Bridge - 114RR4234] Temporal Representation: Data was collected over the time period 6/21/2001-6/25/2001. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124261 Pollutant: Simazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Simazine, Total. Fourteen sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for simazine is 0.004 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 6/26/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124273 Pollutant: Simazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Simazine, Total. Five sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for simazine is 0.004 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference:

DECISION ID

157581

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Silver
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326645

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Silver.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124263

Pollutant:

Simazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Simazine, Total. Fourteen sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for simazine is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/26/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114469

Pollutant:

Simazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Simazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326624 <


DECISION ID	167518	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Simetryn
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167518, Simetryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124274

Pollutant:

Simetryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Simetryn, Total. Fourteen sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Fourteen samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Silver.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326653

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Silver.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 6/26/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167518, Simetryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124275

Pollutant:

Simetryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Simetryn, Total. Fourteen sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Fourteen samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/26/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167518, Simetryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124285

Pollutant:

Simetryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Simetryn, Total. Five sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

oards.ca.gov/water_issues/programs/tmdl/records/region_1/2018/ref4527.pdf" >Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326675 Pollutant: Silver LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Silver. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for silver is 0.1 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 123990 Pollutant: Silver LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Silver, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for silver is 0.1 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449. Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 43397 Pollutant: Silver LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Silver. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for silver is 0.1 mg/L. Objective/Criterion Reference: Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449. Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 114460 Pollutant: Silver LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 6 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Silver. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for silver is 0.1 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-09-28 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1


DECISION ID	158484	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Sodium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120919

Pollutant:

Sodium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Per the Drinking Water Standards and Health Advisories (USEPA 2012), the health advisory for sodium for individuals on a sodium-restricted diet is 20 mg/l.

3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 123991 Pollutant: Silver LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceed the criterion for Silver, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for silver is 0.1 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449. Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Comminski Station - 114RRCOMM] Temporal Representation: Data was collected over the time period 6/21/2001-6/25/2001. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 114459 Pollutant: Silver LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 6 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Silver. 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site(s) (USGS-11463980) Temporal Representation: The samples were collected between the dates of 2011-07-28 and 2011-07-28 Environmental Conditions: QAPP Information: QAPP not required for federal data QAPP Information Reference(s): This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 329126 Pollutant: Sodium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Sodium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Per the Drinking Water Standards and Health Advisories (USEPA 2012), the health advisory for sodium for individuals on a sodium-restricted diet is 20 mg/l. Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 329035 Pollutant: Sodium LOE Subgroup: Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for silver is 0.1 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-09-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 123992 Pollutant: Silver LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 23 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 23 samples exceed the criterion for Silver, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for silver is 0.1 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449. Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 6/21/2001-11/13/2006. Environmental Conditions: There are no known environmental cft" valign="top" width="67%">Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Sodium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Per the Drinking Water Standards and Health Advisories (USEPA 2012), the health advisory for sodium for individuals on a sodium-restricted diet is 20 mg/l. Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA). Temporal Representation: The samples were collected between the dates of 2017-05-01 and 2017-05-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 105118 Pollutant: Sodium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed DFW_ABL_Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Sodium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring. SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 33676 Pollutant: Silver LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: None of the 4 samples exceeded the hardness based criteria calculated for silver. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Samples collected at station 114RR5652 (Russian River at Crocker Road). Temporal Representation: Samples collected between 11/26/2007 and 7/14/2008. Environmental Conditions: QAPP Information: SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 33125 Pollutant: Silver LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Per the Drinking Water Standards and Health Advisories (USEPA 2012), the health advisory for sodium for individuals on a sodium-restricted diet is 20 mg/l. Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site(s) (114CR0903) Temporal Representation: The samples were collected between the dates of 2013-08-26 and 2013-09-25 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 115597 Pollutant: Sodium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Agricultural Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed DFW_ABL_Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Sodium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring. SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water, including irrigation of various types of crops and stock watering. At or below the sodium threshold of 69 mg/L, agricultural uses of water should not be limited. Guideline Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) Spatial Representation: The samples were collected at 1 monitoring site(s) (114CR0903) Temporal Representation: The samples were collected between the dates of 2013-08-26 and 2013-09-25 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 120814 Pollutant: Sodium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Agricultural Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed NWIS data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Sodium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water, including irrigation of various types of crops and stock watering. At or below the sodium threshold of 69 mg/L, agricultural uses of water should not be limited. Guideline Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) Spatial Representation: The samples were collected at 1 monitoring site(s) (USGS-11463980) Temporal Representation: The samples were collected between the dates of 2011-07-28 and 2011-07-28 Environmental Conditions: QAPP Information: QAPP not required for federal data QAPP Information Reference(s): This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 329053 Pollutant: Sodium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Sodium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: None of the 4 samples exceeded the hardness based criteria calculated for silver. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Samples collected at station 114RR5652 (Russian River at Crocker Road). Temporal Representation: Samples collected between 11/26/2007 and 7/14/2008. Environmental Conditions: QAPP Information: SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 109895 Pollutant: Silver LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 6 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Silver. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion maximum concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-09-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 114458 Pollutant: Silver LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 6 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Silver. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion maximum concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-09-28 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 109896 Pollutant: Silver LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 6 Number of Exceedances: 0 Data and Information Type: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Per the Drinking Water Standards and Health Advisories (USEPA 2012), the health advisory for sodium for individuals on a sodium-restricted diet is 20 mg/l. Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 329068 Pollutant: Sodium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Agricultural Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Sodium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water, including irrigation of various types of crops and stock watering. At or below the sodium threshold of 69 mg/L, agricultural uses of water should not be limited. Guideline Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 329062 Pollutant: Sodium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Agricultural Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Sodium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water, including irrigation of various types of crops and stock watering. At or below the sodium threshold of 69 mg/L, agricultural uses of water should not be limited. Guideline Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 329061 Pollutant: Sodium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed EPA Nationp" width="67%">PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Silver. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion maximum concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-09-28 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 109892 Pollutant: Silver LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 6 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Silver. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion maximum concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-09-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326642 Pollutant: Silver LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Silver. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for silver is 0.1 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326689 Pollutant: Silver LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Silver. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The dissolved silver criterion maximum concentration (CMC) to protect aquatic life in freshwater is hardnesss dependent. The criterion when calculated using a default hardness of 100 mg/L is 3.4 ug/L. This criterion was divided by 2 in order to better represent a CMC value as specified in footnote (g) of Table (b)(1) of the California Toxics Rule, 2000. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-14 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124260 Pollutant: Silver LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 23 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 23 samples exceed the criterion for Silver, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for silver is 0.1 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449. Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 6/22/2001-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157581, Silver	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326662 Pollutant: Silver LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Silver. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for silver is 0.1 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP al Aquatic Resources Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Sodium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Per the Drinking Water Standards and Health Advisories (USEPA 2012), the health advisory for sodium for individuals on a sodium-restricted diet is 20 mg/l. Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River). Temporal Representation: The samples were collected between the dates of 2013-08-26 and 2013-09-25 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 329097 Pollutant: Sodium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Sodium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Per the Drinking Water Standards and Health Advisories (USEPA 2012), the health advisory for sodium for individuals on a sodium-restricted diet is 20 mg/l. Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 329041 Pollutant: Sodium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Agricultural Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Sodium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water, including irrigation of various types of crops and stock watering. At or below the sodium threshold of 69 mg/L, agricultural uses of water should not be limited. Guideline Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) Spatial Representation: The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA). Temporal Representation: The samples were collected between the dates of 2017-05-01 and 2017-05-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 329047 Pollutant: Sodium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Agricultural Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed EPA National Aquatic Resources Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Sodium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water, including irrigation of various types of crops and stock watering. At or below the sodium threshold of 69 mg/L, agricultural uses of water should not be limited. Guideline Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) Spatial Representation: The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River). Temporal Representation: The samples were collected between the dates of 2013-08-26 and 2013-09-25 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 329054 Pollutant: Sodium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Agricultural Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Sodium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water, including irrigation of various types of crops and stock watering. At or below the sodium threshold of 69 mg/L, agricultural uses of water should not be limited. Guideline Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle


DECISION ID	157582	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Simazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 120906 has been replaced by LOE 351033, LOE 114468 has been replaced by LOE 350952, LOE 114464 has been replaced by LOE 351070, LOE 43156 has been replaced by LOE 350974, LOE 114461 has been replaced by LOE 351059, LOE 120895 has been replaced by LOE 350985, LOE 114463 has been replaced by LOE 351073, LOE 114467 has been replaced by LOE 350996, LOE 114470 has been replaced by LOE 351009, and LOE 43404 has been replaced by LOE 350982 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Twenty-two lines of evidence are available in the administrative record to assess this pollutant. Two out of two samples exceed the objective for the MUN beneficial use(s). Two exceedances are split between one station(s) over a four day period (6/21/2001 - 6/25/2001) and have been averaged to a single exceedances because they are not temporally independent and represent a single event; therefore these two samples are being assessed as a single sample. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Two out of two samples exceed the objective for the MUN beneficial use(s). Two exceedances are split between one station(s) over a four day period (6/21/2001 - 6/25/2001) and have been averaged to a single exceedances because they are not temporally independent and represent a single event; therefore these two samples are being assessed as a single sample. This sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114462

Pollutant:

Simazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Simazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43360

Pollutant:

Simazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for simazine is 0.004 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114465

Pollutant:

Simazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Simazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326713

Pollutant:

Simazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Simazine.


DECISION ID	158485	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Strontium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 158485, Strontium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329167

Pollutant:

Strontium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Stronitum as a drinking water level is a concentration of 4 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158485, Strontium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329172

Pollutant:

Strontium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Stronitum as a drinking water level is a concentration of 4 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158485, Strontium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329169

Pollutant:

Strontium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Stronitum as a drinking water level is a concentration of 4 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA


DECISION ID	157583	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Sulfates
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for conventional or other pollutants (Table 3.2 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

ysiological responses in, human, plant, animal, or aquatic life. (Basin Plan).

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Simazine.

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

The samples were collected between the dates of 2014-02-03 and 2014-02-03

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Simazine.

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site(s) (USGS-11463980)

The samples were collected between the dates of 2011-07-28 and 2011-07-28

QAPP not required for federal data

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Sulfate.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute).

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

Water Quality Control Plan (Basin Plan) for the North Coast Region

The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute).

The samples were collected at 1 monitoring site: USGS-11463682 (RUSSIAN R A JIMTOWN CA).

The samples were collected between the dates of 2016-10-28 and 2016-10-28

Quality-Assurance Plan for Water Quality Activities of the California Water Science Center

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

The samples were collected between the dates of 2017-06-11 and 2018-06-08

QAPP not required for USGS projects

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Sulfate.

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157582, Simazine

Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Simazine.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute).

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

The samples were collected between the dates of 2017-07-18 and 2017-09-14

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site(s) (114PS0229)

The samples were collected between the dates of 2013-06-04 and 2013-06-04

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Quality Control Plan (Basin Plan) for the North Coast Region

The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute).

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Simazine.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute).

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Line of Evidence (LOE) for Decision ID 157582, Simazine

Regiolign="left" valign="top" width="67%">Municipal & Domestic Supply

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Sulfate.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site(s) (114RR5568)

The samples were collected between the dates of 2015-08-03 and 2015-08-03

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Sulfate.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site(s) (114BS0310)

Russian River HU, Middle Russian River HA, Geyserville HSA

The sn 1

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Simazine.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute).

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental phamples were collected between the dates of 2010-09-30 and 2011-11-30

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Sulfate.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site(s) (114RR5652)

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Quality Control Plan (Basin Plan) for the North Coast Region

The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute).

The samples were collected at 1 monitoring site: USGS-11463682 (RUSSIAN R A JIMTOWN CA).

The samples were collected between the dates of 2016-10-28 and 2016-10-28

Quality-Assurance Plan for Water Quality Activities of the California Water Science Center

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Simazine.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute).

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Line of Evidence (LOE) for Decision ID 157582, Simazine

None of the 55 sulfate samples collected in the mainstem Russian River exceed the evaluation guideline. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008).

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Per the Basin Plan (NCRWQCB 2007, p. 3-3.00): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Per 22 CCR 64449 (Table 64449-B): The recommended secondary maximum contaminant level for sulfate is 250 mg/L.

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Samples were collected from the mainstem Russian River at 6 locations as follows: (1) at Comminski Station (SWAMP Station ID 114RRCOMM), (2) at Cloverdale (SWAMP Station ID 114RRCLO1), (3) downstream of the Cloverdale Water Treatment Plant (SWAMP Station ID 114CLOSTP), (4) at Geyserville (SWAMP Station ID 114RRGEYS), (5) at Alexander Valley Bridge (SWAMP Station ID 114RRALEX), and (6) at Healdsburg Memorial Beach (SWAMP Station ID 114RRHMB1). Samples were collected from well-mixed flows in glides or riffles.

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

None of the 4 samples exceeded the evaluation guideline.

Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Simazine.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute).

The samples were collected at 1 monitoring site: 114RR4234_SWAMP (Russian River at Alexander Valley Bridge).

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Quality Control Plan (Basin Plan) for the North Coast Region

Per 22 CCR 64449 (Table 64449-B): The recommended secondary maximum contaminant level for sulfate is 250 mg/L.

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Samples were collected from the Russian River at Crocker Road station (114RR5652).

Samples were collected approximately once per quarter year from November 2007 to July 2008.

SWAMP QAPP

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

None of the 33 sulfate samples collected from the mainstem Russian River exceed the objective. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008). This LOE and LOE 46523 contain data originally evaluated in LOE 25557, which included data from a site that is not in this water body. The data from LOE 25557 have been split into two LOEs, with data now evaluated under the correct water body.

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Revised Draft of the 2007 Review of the Monitoring Data for the Irrigated Lands Regulatory Conditional Waiver Program

Per 22 CCR 64449 (Table 64449-B): The recommended secondary maximum contaminant level for sulfate is 250 mg/L.

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Samples were collected from the mainstem Russian River at 5 locations as follows: (1) at Comminski Station (SWAMP Station ID 114RRCOMM), (2) at Cloverdale (SWAMP Station ID 114RRCLO1), (3) downstream of the Cloverdale Water Treatment Plant (SWAMP Station ID 114CLOSTP), (4) at Geyserville (SWAMP Station ID 114RRGEYS), and (5) at Alexander Valley Bridge (SWAMP Station ID 114RRALEX). Samples were collected from well-mixed flows in glides or riffles.

At the Comminski Station, Geyserville, and Alexander Valley Bridge sites, samples were collected over 2 site visits at each site during June 2001. At the Cloverdale site, samples were collected over 22 site visits from June 2001 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.

Water Quality Control Plan (Basin Plan) for the North Coast Region

The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute).

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site(s) (USGS-11463682)

The samples were collected between the dates of 2016-10-28 and 2016-10-28

QAPP not required for federal data

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

124262

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site(s) (114CR0903)

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA5 to determine beneficial use support and results are as follows: 2 of 2 samples exceed the criterion for Simazine, Total. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for simazine is 0.004 mg/L.

Water Quality Control Plan (Basin Plan) for the North Coast Region

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA5 was collected at 1 monitoring site [ Russian River at Alexander Valley Bridge - 114RR4234]

Data was collected over the time period 6/21/2001-6/25/2001.

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Simazine, Total. Fourteen sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the samth="33%">Number of Exceedances:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Sulfate.

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

The samples were collected between the dates of 2016-12-15 and 2017-02-07

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Sulfate.

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for simazine is 0.004 mg/L.

Water Quality Control Plan (Basin Plan) for the North Coast Region

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Data was collected over the time period 6/26/2002-11/13/2006.

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Simazine, Total. Five sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for simazine is 0.004 mg/L.

Water Quality Control Plan (Basin Plan) for the North Coast Region

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Data was collected over the time period 10/5/2004-6/30/2005.

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Simazine, Total. Fourteen sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for simazine is 0.004 mg/L.

Water Quality Control Plan (Basin Plan) for the North Coast Region

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Data was collected over the time period 6/26/2002-11/13/2006.

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157582, Simazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Simazine.

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Water Quality Control Plan (Basin Plan) for the North Coast Region

The samples were collected at 1 monitoring site(s) (114RR5652)

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

gn="left" valign="top" width="67%">QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326849 Pollutant: Sulfates LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Sulfate. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for sulfate is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2017-02-02 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 329196 Pollutant: Sulfates LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Sulfate. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for sulfate is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 329182 Pollutant: Sulfates LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Sulfate. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for sulfate is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA). Temporal Representation: The samples were collected between the dates of 2017-05-01 and 2017-05-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle



DECISION ID	167518	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Simetryn
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167518, Simetryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124274

Pollutant:

Simetryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Simetryn, Total. Fourteen sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Fourteen samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 329234 Pollutant: Sulfates LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed EPA National Aquatic Resources Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Sulfate. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for sulfate is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River). Temporal Representation: The samples were collected between the dates of 2013-08-26 and 2013-09-25 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 329209 Pollutant: Sulfates LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Sulfate. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for sulfate is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326894 Pollutant: Sulfates LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP Perennial Stream Surveys data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Sulfate. Data Reference: Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for sulfate is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.). Temporal Representation: The samples were collected between the dates of 2015-07-06 and 2015-07-06 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP ters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 6/26/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167518, Simetryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124275 Pollutant: Simetryn LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Simetryn, Total. Fourteen sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Fourteen samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 6/26/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167518, Simetryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124285 Pollutant: Simetryn LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Simetryn, Total. Five sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	167519	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Sulfotep
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167519, Sulfotep	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124299

Pollutant:

Sulfotep

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Sulfotep, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:


DECISION ID	158484	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Sodium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120919

Pollutant:

Sodium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Per the Drinking Water Standards and Health Advisories (USEPA 2012), the health advisory for sodium for individuals on a sodium-restricted diet is 20 mg/l.

64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167519, Sulfotep	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124286

Pollutant:

Sulfotep

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Sulfotep, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167519, Sulfotep	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124287

Pollutant:

Sulfotep

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Sulfotep, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (USGS-11463980)

Temporal Representation:

The samples were collected between the dates of 2011-07-28 and 2011-07-28

Environmental Conditions:

QAPP Information:

QAPP not required for federal data

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329126

Pollutant:

Sodium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Per the Drinking Water Standards and Health Advisories (USEPA 2012), the health advisory for sodium for individuals on a sodium-restricted diet is 20 mg/l.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329035

Pollutant:

Sodium

LOE Subgroup:

DECISION ID

167520

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Tedion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167520, Tedion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124300

Pollutant:

Tedion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tedion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Per the Drinking Water Standards and Health Advisories (USEPA 2012), the health advisory for sodium for individuals on a sodium-restricted diet is 20 mg/l.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-05-01 and 2017-05-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

105118

Pollutant:

Sodium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167520, Tedion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124312

Pollutant:

Tedion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tedion, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167520, Tedion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124301

Pollutant:

Tedion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tedion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

67%">Per the Drinking Water Standards and Health Advisories (USEPA 2012), the health advisory for sodium for individuals on a sodium-restricted diet is 20 mg/l. Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site(s) (114CR0903) Temporal Representation: The samples were collected between the dates of 2013-08-26 and 2013-09-25 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

DECISION ID

157585

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Terbufos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116138

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Per the Drinking Water Standards and Health Advisories (USEPA 2012), the health advisory for sodium for individuals on a sodium-restricted diet is 20 mg/l.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329068

Pollutant:

Sodium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

&idth="67%">The evaluation guideline for Terbufos is the USEPA Aquatic Life Benchmark of 0.03 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

113139

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Terbufos is the USEPA Aquatic Life Benchmark of 0.03 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157585, Terbufos

Region 1

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329062

Pollutant:

Sodium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329061

Pollutant:

Sodium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed EPA NationTOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

106446

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Terbufos is the USEPA Aquatic Life Benchmark of 0.03 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

119007

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessmental Aquatic Resources Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Sodium.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Per the Drinking Water Standards and Health Advisories (USEPA 2012), the health advisory for sodium for individuals on a sodium-restricted diet is 20 mg/l.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River).

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329097

Pollutant:

Sodium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Per the Drinking Water Standards and Health Advisories (USEPA 2012), the health advisory for sodium for individuals on a sodium-restricted diet is 20 mg/l.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Terbufos is the USEPA Aquatic Life Benchmark of 0.03 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

106363

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Terbufos is the USEPA Aquatic Life Benchmark of 0.03 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114482

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Terbufos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water health advisory for terbufos is 0.4 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124313

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-asses"left" valign="top" width="33%">QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329041

Pollutant:

Sodium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-05-01 and 2017-05-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329047

Pollutant:

Sodium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed EPA National Aquatic Resources Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Sodium.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River).

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 158484, Sodium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329054

Pollutant:

Sodium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

sed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Terbufos, Total. Forty-eight sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: According to the 2006 USEPA Drinking Water Standards and Health Advisories, the Life-time Exposure Health Advisory for Terbufos is 0.0004 mg/L. (EPA 822-R-06-013, 2006) Guideline Reference: 2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013 Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 106458 Pollutant: Terbufos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Terbufos. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Terbufos is the USEPA Aquatic Life Benchmark of 0.03 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 114RR5652). Temporal Representation: Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327005 Pollutant: Terbufos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Terbufos. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for terbufos is the USEPA Aquatic Life Benchmark of 0.03 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157585, Terbufos

DECISION ID	158485	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Strontium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 158485, Strontium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329167

Pollutant:

Strontium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Stronitum as a drinking water level is a concentration of 4 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158485, Strontium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329172

Pollutant:

Strontium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Stronitum as a drinking water level is a concentration of 4 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158485, Strontium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329169

Pollutant:

Strontium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Stronitum as a drinking water level is a concentration of 4 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

kground-color:#CCCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: right; PADDING-TOP: 3px; font-smooth: always">Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327008 Pollutant: Terbufos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Terbufos. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA drinking water health advisory for terbufos is 0.4 ug/L. Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327009 Pollutant: Terbufos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Terbufos. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for terbufos is the USEPA Aquatic Life Benchmark of 0.03 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124326 Pollutant: Terbufos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Terbufos, Total. Fifteen sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: According to the 2006 USEPA Drinking Water Standards and Health Advisories, the Life-time Exposure Health Advisory for Terbufos is 0.0004 mg/L. (EPA 822-R-06-013, 2006) Guideline Reference: 2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013 Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collecte


DECISION ID	157583	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Sulfates
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for conventional or other pollutants (Table 3.2 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120839

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114483

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Terbufos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water health advisory for terbufos is 0.4 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114481

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix align="left" valign="top" width="67%">Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (USGS-11463980)

Temporal Representation:

The samples were collected between the dates of 2011-07-28 and 2011-07-28

Environmental Conditions:

QAPP Information:

QAPP not required for federal data

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114476

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Sulfate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329201

Pollutant:

Sulfates

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Terbufos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water health advisory for terbufos is 0.4 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124314

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Terbufos, Total. Forty-eight sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the 2006 USEPA Drinking Water Standards and Health Advisories, the Life-time Exposure Health Advisory for Terbufos is 0.0004 mg/L. (EPA 822-R-06-013, 2006)

Guideline Reference:

2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

align="left" valign="top" width="33%">LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Sulfate. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for sulfate is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326892 Pollutant: Sulfates LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Sulfate. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for sulfate is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport). Temporal Representation: The samples were collected between the dates of 2017-07-18 and 2017-09-14 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 112142 Pollutant: Sulfates LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP Perennial Stream Surveys data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Sulfate. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for sulfate is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114PS0229) Temporal Representation: The samples were collected between the dates of 2013-06-04 and 2013-06-04 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 114479 Pollutant: Sulfates LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use:

DECISION ID

157609

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Terbuthylazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

gn="top" width="67%">Water

Line of Evidence (LOE) for Decision ID 157609, Terbuthylazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114484

Pollutant:

Terbuthylazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Terbuthylazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Terbuthylazine is the USEPA Aquatic Life Benchmark of 1800 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157609, Terbuthylazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327017

Pollutant:

Terbuthylazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Terbuthylazine.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for terbuthylazine is the USEPA Aquatic Life Benchmark of 1,800 ug/L for a fish (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157609, Terbuthylazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327021

Pollutant:

Terbuthylazine

LOE Subgroup:

Pollutant-Water

Matrix:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Sulfate.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5568)

Temporal Representation:

The samples were collected between the dates of 2015-08-03 and 2015-08-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114473

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Sulfate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114480

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Sulfate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

25557

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Terbuthylazine.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for terbuthylazine is the USEPA Aquatic Life Benchmark of 1,800 ug/L for a fish (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157609, Terbuthylazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114488

Pollutant:

Terbuthylazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Terbuthylazine.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Terbuthylazine is the USEPA Aquatic Life Benchmark of 1800 ug/L for a fish (acute).

Guideline Reference:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Per 22 CCR 64449 (Table 64449-B): The recommended secondary maximum contaminant level for sulfate is 250 mg/L.

Guideline Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Spatial Representation:

Samples were collected from the mainstem Russian River at 6 locations as follows: (1) at Comminski Station (SWAMP Station ID 114RRCOMM), (2) at Cloverdale (SWAMP Station ID 114RRCLO1), (3) downstream of the Cloverdale Water Treatment Plant (SWAMP Station ID 114CLOSTP), (4) at Geyserville (SWAMP Station ID 114RRGEYS), (5) at Alexander Valley Bridge (SWAMP Station ID 114RRALEX), and (6) at Healdsburg Memorial Beach (SWAMP Station ID 114RRHMB1). Samples were collected from well-mixed flows in glides or riffles.

Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33864

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the evaluation guideline.

Data Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

OPP Aquatic Life Benchmarks

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157609, Terbuthylazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114490

Pollutant:

Terbuthylazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Terbuthylazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Terbuthylazine is the USEPA Aquatic Life Benchmark of 1800 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157609, Terbuthylazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114486

Pollutant:

Terbuthylazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Terbuthylazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Terbuthylazine is the USEPA Aquatic Life Benchmark of 1800 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157609, Terbuthylazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114487

Pollutant:

Terbuthylazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Terbuthylazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Terbuthylazine is the USEPA Aquatic Life Benchmark of 1800 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157609, Terbuthylazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114485

Pollutant:

Terbuthylazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Terbuthylazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Terbuthylazine is the USEPA Aquatic Life Benchmark of 1800 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

"left" valign="top" width="33%">Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Per 22 CCR 64449 (Table 64449-B): The recommended secondary maximum contaminant level for sulfate is 250 mg/L. Guideline Reference: Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations Spatial Representation: Samples were collected from the Russian River at Crocker Road station (114RR5652). Temporal Representation: Samples were collected approximately once per quarter year from November 2007 to July 2008. Environmental Conditions: QAPP Information: SWAMP QAPP QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 46522 Pollutant: Sulfates LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Not Recorded Beneficial Use: Municipal & Domestic Supply Number of Samples: 33 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: None of the 33 sulfate samples collected from the mainstem Russian River exceed the objective. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008). This LOE and LOE 46523 contain data originally evaluated in LOE 25557, which included data from a site that is not in this water body. The data from LOE 25557 have been split into two LOEs, with data now evaluated under the correct water body. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007, p. 3-3.00): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses. Objective/Criterion Reference: Revised Draft of the 2007 Review of the Monitoring Data for the Irrigated Lands Regulatory Conditional Waiver Program Evaluation Guideline: Per 22 CCR 64449 (Table 64449-B): The recommended secondary maximum contaminant level for sulfate is 250 mg/L. Guideline Reference: Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations Spatial Representation: Samples were collected from the mainstem Russian River at 5 locations as follows: (1) at Comminski Station (SWAMP Station ID 114RRCOMM), (2) at Cloverdale (SWAMP Station ID 114RRCLO1), (3) downstream of the Cloverdale Water Treatment Plant (SWAMP Station ID 114CLOSTP), (4) at Geyserville (SWAMP Station ID 114RRGEYS), and (5) at Alexander Valley Bridge (SWAMP Station ID 114RRALEX). Samples were collected from well-mixed flows in glides or riffles. Temporal Representation: At the Comminski Station, Geyserville, and Alexander Valley Bridge sites, samples were collected over 2 site visits at each site during June 2001. At the Cloverdale site, samples were collected over 22 site visits from June 2001 to June 2006. At the site downstream of the Cloverdale Water Treatment Plant, samples were collected over 5 site visits from October 2004 to June 2005. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 117007 Pollutant: Sulfates LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed DFW_ABL_Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Sulfate. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring. SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for sulfate is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114CR0903) Temporal Representation: The samples were collected between the dates of 2013-08-26 and 2013-09-25 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326868 Pollutant: Sulfates LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 4

DECISION ID

157607

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Terbutryn
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157607, Terbutryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327026

Pollutant:

Terbutryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Terbutryn.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA expected safe lifetime exposure limit in drinking water for Terbutryn, calculated using the IRIS Reference Dose, is 7 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.001 mg/kg/day as the reference dose.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157607, Terbutryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

112537

Pollutant:

Terbutryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Terbutryn.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157607, Terbutryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114491

Pollutant:

Terbutryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Terbutryn.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157607, Terbutryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114493

Pollutant:

Terbutryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Terbutryn.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

th="33%">Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Sulfate. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for sulfate is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2016-12-15 and 2017-02-07 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326878 Pollutant: Sulfates LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Sulfate. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for sulfate is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road). Temporal Representation: The samples were collected between the dates of 2019-01-16 and 2019-01-16 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA



DECISION ID	157586	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Tetrachlorvinphos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157586, Tetrachlorvinphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114494

Pollutant:

Tetrachlorvinphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Tetrachlorvinphos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA expected safe lifetime exposure limit in drinking water for Tetrachlorvinphos, calculated using the IRIS Reference Dose, is 210 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumptiDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 157583, Sulfates

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157583, Sulfates	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 326894 Pollutant: Sulfates LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP Perennial Stream Surveys data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Sulfate. Data Reference: Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for sulfate is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.). Temporal Representation: The samples were collected between the dates of 2015-07-06 and 2015-07-06 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP on, 20% relative source contribution from drinking water, and 0.03 mg/kg/day as the reference dose. Guideline Reference: IRIS Reference Summary (Various Pollutants) Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157586, Tetrachlorvinphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124338 Pollutant: Tetrachlorvinphos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tetrachlorvinphos, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157586, Tetrachlorvinphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124328 Pollutant: Tetrachlorvinphos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tetrachlorvinphos, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 2/6/2002-11/13/2006. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157586, Tetrachlorvinphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327057 Pollutant: Tetrachlorvinphos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat

DECISION ID

167519

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Sulfotep
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167519, Sulfotep	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124299

Pollutant:

Sulfotep

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Sulfotep, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167519, Sulfotep	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124286

Pollutant:

Sulfotep

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Sulfotep, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167519, Sulfotep	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124287

Pollutant:

Sulfotep

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Sulfotep, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

td> Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Tetrachlorvinphos. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for stirophos (tetrachlorvinphos) is the USEPA Aquatic Life Benchmark of 0.125 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157586, Tetrachlorvinphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 124327 Pollutant: Tetrachlorvinphos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Municipal & Domestic Supply Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tetrachlorvinphos, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan. No evaluation guideline could be found to evaluate protection of the MUN beneficial use that meets the requirements of Section 6.1.3 of the Listing Policy.

DECISION ID

167520

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Tedion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167520, Tedion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124300

Pollutant:

Tedion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tedion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157586, Tetrachlorvinphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327061

Pollutant:

Tetrachlorvinphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Tetrachlorvinphos.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for stirophos (tetrachlorvinphos) is the USEPA Aquatic Life Benchmark of 0.125 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157586, Tetrachlorvinphos

Region 1

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167520, Tedion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124312

Pollutant:

Tedion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tedion, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167520, Tedion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124301

Pollutant:

Tedion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tedion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

tyle="background-color:#CCCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 114495 Pollutant: Tetrachlorvinphos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Tetrachlorvinphos. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA expected safe lifetime exposure limit in drinking water for Tetrachlorvinphos, calculated using the IRIS Reference Dose, is 210 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.03 mg/kg/day as the reference dose. Guideline Reference: IRIS Reference Summary (Various Pollutants) Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157586, Tetrachlorvinphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 114496 Pollutant: Tetrachlorvinphos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Tetrachlorvinphos. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA expected safe lifetime exposure limit in drinking water for Tetrachlorvinphos, calculated using the IRIS Reference Dose, is 210 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.03 mg/kg/day as the reference dose. Guideline Reference: IRIS Reference Summary (Various Pollutants) Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157586, Tetrachlorvinphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327052 Pollutant: Tetrachlorvinphos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Tetrachlorvinphos. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The USEPA expected safe lifetime exposure limit in drinking water for Tetrachlorvinphos, calculated using the IRIS Reference Dose, is 210 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.03 mg/kg/day as the reference dose. Guideline Reference: IRIS Reference Summary (Various Pollutants) Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP


DECISION ID	157613	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Thiobencarb
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114504

Pollutant:

Thiobencarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Thiobencarb.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Thiobencarb is the USEPA Aquatic Life Benchmark of 1 ug/L for an invertebrate (chronic).

Guideline Reference:

DECISION ID

157585

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Terbufos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116138

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

OPP Aquatic Life Benchmarks

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327082

Pollutant:

Thiobencarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Thiobencarb.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for thiobencarb is the USEPA Aquatic Life Benchmark of 1 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114497

Pollutant:

Thiobencarb

LOE Subgroup:

Pollutant-Water

Matrix:

The evaluation guideline for Terbufos is the USEPA Aquatic Life Benchmark of 0.03 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

113139

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Terbufos is the USEPA Aquatic Life Benchmark of 0.03 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

106446

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Terbufos is the USEPA Aquatic Life Benchmark of 0.03 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR4234_SWAMP).

Temporal Representation:

Date for this waterbody was collected over the date range 2014-02-03 to 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

119007

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment%">Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Thiobencarb.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Thiobencarb is the USEPA Aquatic Life Benchmark of 1 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114498

Pollutant:

Thiobencarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Thiobencarb.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

351110

Pollutant:

Thiobencarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for thiobencarb is the USEPA Aquatic Life Benchmark of 1 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

351108

Pollutant:

Thiobencarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Terbufos is the USEPA Aquatic Life Benchmark of 0.03 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

106363

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Terbufos is the USEPA Aquatic Life Benchmark of 0.03 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114BS0310).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114482

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Terbufos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water health advisory for terbufos is 0.4 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124313

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Terbufos, Total. Forty-eight sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the 2006 USEPA Drinking Water Standards and Health Advisories, the Life-time Exposure Health Advisory for Terbufos is 0.0004 mg/L. (EPA 822-R-06-013, 2006)

Guideline Reference:

2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

106458

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for thiobencarb is the USEPA Aquatic Life Benchmark of 1 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114505

Pollutant:

Thiobencarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Thiobencarb.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327078

Pollutant:

Thiobencarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Thiobencarb.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for thiobencarb is the USEPA Aquatic Life Benchmark of 1 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327086

Pollutant:

Thiobencarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Terbufos is the USEPA Aquatic Life Benchmark of 0.03 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 114RR5652).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-11-30 to 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327005

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for terbufos is the USEPA Aquatic Life Benchmark of 0.03 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327008

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Terbufos.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water health advisory for terbufos is 0.4 ug/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327009

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for terbufos is the USEPA Aquatic Life Benchmark of 0.03 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124326

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Terbufos, Total. Fifteen sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the 2006 USEPA Drinking Water Standards and Health Advisories, the Life-time Exposure Health Advisory for Terbufos is 0.0004 mg/L. (EPA 822-R-06-013, 2006)

Guideline Reference:

2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collecte67%">1

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Thiobencarb.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43201

Pollutant:

Thiobencarb/Bolero

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of anyd at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114483

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Terbufos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water health advisory for terbufos is 0.4 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114481

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124339

Pollutant:

Thiobencarb/Bolero

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Thiobencarb, Total. Forty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Terbufos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water health advisory for terbufos is 0.4 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157585, Terbufos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124314

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Terbufos, Total. Forty-eight sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

124340

Pollutant:

Thiobencarb/Bolero

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Thiobencarb, Total. Forty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124147

Pollutant:

Thiobencarb/Bolero

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterio or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the 2006 USEPA Drinking Water Standards and Health Advisories, the Life-time Exposure Health Advisory for Terbufos is 0.0004 mg/L. (EPA 822-R-06-013, 2006)

Guideline Reference:

2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

n for Thiobencarb, Total. Ten sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data. Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for thiobencarb is 0.001 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Objective/Criterion Reference: Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449. Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP] Temporal Representation: Data was collected over the time period 10/5/2004-6/30/2005. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 114503 Pollutant: Thiobencarb LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Thiobencarb. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Thiobencarb is the USEPA Aquatic Life Benchmark of 1 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 114499 Pollutant: Thiobencarb LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Thiobencarb. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Thiobencarb is the USEPA Aquatic Life Benchmark of 1 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 114506 Pollutant: Thiobencarb LOE Subgroup: Pollutant-Water

DECISION ID

157609

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Terbuthylazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157609, Terbuthylazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114484

Pollutant:

Terbuthylazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Terbuthylazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Terbuthylazine is the USEPA Aquatic Life Benchmark of 1800 ug/L for a fish (acute).

Guideline Reference:

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Thiobencarb.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Thiobencarb is the USEPA Aquatic Life Benchmark of 1 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114501

Pollutant:

Thiobencarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Thiobencarb.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Thiobencarb is the USEPA Aquatic Life Benchmark of 1 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114502

Pollutant:

Thiobencarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Thiobencarb.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

s.ca.gov/water_issues/programs/tmdl/records/state_board/2018/ref4508.xlsx" >OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157609, Terbuthylazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327017 Pollutant: Terbuthylazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Terbuthylazine. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for terbuthylazine is the USEPA Aquatic Life Benchmark of 1,800 ug/L for a fish (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157609, Terbuthylazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327021 Pollutant: Terbuthylazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Terbuthylazine. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for terbuthylazine is the USEPA Aquatic Life Benchmark of 1,800 ug/L for a fish (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157609, Terbuthylazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 114488 Pollutant: Terbuthylazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Terbuthylazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Terbuthylazine is the USEPA Aquatic Life Benchmark of 1800 ug/L for a fish (acute). Guideline Reference: <


DECISION ID	167522	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Tokuthion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167522, Tokuthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124148

Pollutant:

Tokuthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tokuthion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Sea href="https://www.waterboards.ca.gov/water_issues/programs/tmdl/records/state_board/2018/ref4508.xlsx" >OPP Aquatic Life Benchmarks

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157609, Terbuthylazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114490

Pollutant:

Terbuthylazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Terbuthylazine.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Terbuthylazine is the USEPA Aquatic Life Benchmark of 1800 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157609, Terbuthylazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114486

Pollutant:

Terbuthylazine

LOE Subgroup:

Pollutant-Water

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167522, Tokuthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124160

Pollutant:

Tokuthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tokuthion, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167522, Tokuthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124149

Pollutant:

Tokuthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tokuthion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

tr> Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Terbuthylazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Terbuthylazine is the USEPA Aquatic Life Benchmark of 1800 ug/L for a fish (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157609, Terbuthylazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 114487 Pollutant: Terbuthylazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Terbuthylazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Terbuthylazine is the USEPA Aquatic Life Benchmark of 1800 ug/L for a fish (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157609, Terbuthylazine	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 114485 Pollutant: Terbuthylazine LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Terbuthylazine. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Terbuthylazine is the USEPA Aquatic Life Benchmark of 1800 ug/L for a fish (acute). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	155360	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Total Dissolved Solids
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available. BIG SULPHUR CREEK has 1 line of evidence (LOE 318721) and 1 of 1 sample exceeds the MUN beneficial use objective. FRANZ CREEK has 1 line of evidence (LOE 318077) and 0 of 1 sample exceeds the MUN beneficial use objective. RUSSIAN RIVER has twelve lines of evidence (LOEs 100828, 318472, 318949, 318479, 34917, 100827, 100873, 100875, 100871, 318965, 100874, 100872) and 5 of 20 samples exceed the objective but there is insufficient data per station to use Table 3.2 of the Listing Policy. RUSSIAN RIVER AT ALEXANDER VALLEY BRIDGE has two lines of evidence (LOEs 100828, 318472) and 1 of 3 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT ASTI has one line of evidence (LOE 318949) and 2 of 2 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT CLOVERDALE AIRPORT has one line of evidence (LOE 318479) and 1 of 1 sample exceeds the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT CROCKER ROAD has two lines of evidence (LOEs 34917, 100827) and 0 of 4 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVVER AT JOHNSON'S BEACH has one line of evidence (LOE 100873) and 0 of 3 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT MONTE RIO BEACH has one line of evidence (LOE 100875) and 0 of 2 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT ODD FELLOWS CROSSING has one line of evidence (LOE 100871) and 0 of 1 sample exceeds the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT PRESTON has one line of evidence (LOE 318965) and 1 of 2 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER BELOW VACATION BEACH has one line of evidence (LOE 100874) and 0 of 1 sample exceeds the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER NEAR KORBEL has one line of evidence (LOE 100872) and 0 of 1 sample exceeds the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:	BIG SULPHUR CREEK has 1 line of evidence (LOE 318721) and 1 of 1 sample exceeds the MUN beneficial use objective. FRANZ CREEK has 1 line of evidence (LOE 318077) and 0 of 1 sample exceeds the MUN beneficial use objective. RUSSIAN RIVER has twelve lines of evidence (LOEs 100828, 318472, 318949, 318479, 34917, 100827, 100873, 100875, 100871, 318965, 100874, 100872) and 5 of 20 samples exceed the objective but there is insufficient data per station to use Table 3.2 of the Listing Policy. RUSSIAN RIVER AT ALEXANDER VALLEY BRIDGE has two lines of evidence (LOEs 100828, 318472) and 1 of 3 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT ASTI has one line of evidence (LOE 318949) and 2 of 2 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT CLOVERDALE AIRPORT has one line of evidence (LOE 318479) and 1 of 1 sample exceeds the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT CROCKER ROAD has two lines of evidence (LOEs 34917, 100827) and 0 of 4 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVVER AT JOHNSON'S BEACH has one line of evidence (LOE 100873) and 0 of 3 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT MONTE RIO BEACH has one line of evidence (LOE 100875) and 0 of 2 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT ODD FELLOWS CROSSING has one line of evidence (LOE 100871) and 0 of 1 sample exceeds the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT PRESTON has one line of evidence (LOE 318965) and 1 of 2 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER BELOW VACATION BEACH has one line of evidence (LOE 100874) and 0 of 1 sample exceeds the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER NEAR KORBEL has one line of evidence (LOE 100872) and 0 of 1 sample exceeds the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy.

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100827

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for specific conductance. Data range from 129 - 158 mg/L.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: Total dissolved solids concentrations shall conform to Table 3-1 which states that water quality objective for total dissolved solids has an 90% upper limit of 170 mg/L and a 50% upper limit of 150 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates 11/30/2010 - 11/30/2011

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100871

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR1644)

Temporal Representation:

The samples were collected between the dates 12/01/2011

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100828

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for specific conductance. Data range from 213 mg/L.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Re


DECISION ID	157607	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Terbutryn
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157607, Terbutryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327026

Pollutant:

Terbutryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Terbutryn.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157607, Terbutryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

112537

Pollutant:

Terbutryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Terbutryn.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157607, Terbutryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114491

Pollutant:

Terbutryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Terbutryn.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157607, Terbutryn	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114493

Pollutant:

Terbutryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Terbutryn.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

presentation:

The samples were collected between the dates 02/03/2014.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100873

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for specific conductance. Data range from 127 - 153 mg/L.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR1325).

Temporal Representation:

The samples were collected between the dates 12/01/2010 - 02/03/2014.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100874

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR1041).

Temporal Representation:

The samples were collected between the dates 08/02/2011 - 10/25/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100875

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for specific conductance. Data range from 125 - 163 mg/L.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

DECISION ID

157586

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Tetrachlorvinphos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157586, Tetrachlorvinphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114494

Pollutant:

Tetrachlorvinphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Tetrachlorvinphos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA expected safe lifetime exposure limit in drinking water for Tetrachlorvinphos, calculated using the IRIS Reference Dose, is 210 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumptign="top" width="67%">The samples were collected at 1 monitoring site(s) (114RR0898).

Temporal Representation:

The samples were collected between the dates 08/03/2011 - 02/03/2014.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

34917

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Zero of the 2 samples exceeded the objective.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The site specific objective for the mainstem Russian River upstream of the Laguna de Santa Rosa is a 90% upper limit of 170 mg/L. Therefore, 90% of the values in a calendar year must be lower than this limit. In addition the site specific objective of 50% upper limit of 150 mg/L which represents the 50 percentile values of the monthly means for a calendar year applies to this water body. Therefore, 50% or more of the monthly means in a calendar year must be less than or equal to an upper limit.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected from the Russian River at Crocker Road station (114RR5652).

Temporal Representation:

Samples were collected on the following dates: 11/26/2007 3/3/2008 4/7/2008 7/14/2008

Environmental Conditions:

QAPP Information:

N/A

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100872

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal &on, 20% relative source contribution from drinking water, and 0.03 mg/kg/day as the reference dose.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157586, Tetrachlorvinphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124338

Pollutant:

Tetrachlorvinphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tetrachlorvinphos, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR1599).

Temporal Representation:

The samples were collected between the dates 06/02/2011 - 10/25/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318949

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed total dissolved solids data for USGS California Water Science Center and determined that calendar year 2017 exceeds the 50% upper limit and calendar year 2018 exceeds both the 90% and 50% upper limit, so that 2 of 2 samples exceed the water quality objective.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The site specific objective is a 90% upper limit of 170 mg/L. Therefore, 90% of the values in a calendar year must be lower than this limit. In addition the site specific objective of 50% upper limit of 150 mg/L which represents the 50 percentile values of the monthly means for a calendar year applies to this water body. Therefore, 50% or more of the monthly means in a calendar year must be less than or equal to an upper limit.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Line of Evidence (LOE) for Decision ID 157586, Tetrachlorvinphos

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124328

Pollutant:

Tetrachlorvinphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tetrachlorvinphos, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157586, Tetrachlorvinphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327057

Pollutant:

Tetrachlorvinphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater HabitatThese samples were collected at sampling station name: RUSSIAN R A ASTI CA; station code: USGS-11463400.

Temporal Representation:

These samples were collected on 6/11/2017 and 6/10/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318479

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed total dissolved solids data for SWAMP RWB1 Monitoring and determined that calendar year 2017 does not exceed either the 90% upper limit of 200 mg/L or 50% upper limit of 170 mg/L, so that 1 of 1 sample exceeds the water quality objective.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Cloverdale Airport; station code: 114RR5407.

Temporal Representation:

These samples were from 3/5/2016-8/19/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318472

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipaltd>

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Tetrachlorvinphos.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for stirophos (tetrachlorvinphos) is the USEPA Aquatic Life Benchmark of 0.125 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157586, Tetrachlorvinphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124327

Pollutant:

Tetrachlorvinphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tetrachlorvinphos, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed total dissolved solids data from SWAMP RWB1 Monitoring and determined that calendar year 2014 exceeds both the 90% upper limit of 170 mg/L and 50% upper limit of 150 mg/L, so that 1 of 1 sample exceeds the water quality objective.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Alexander Valley Road; station code: 114RR4234.

Temporal Representation:

These samples were collected from 5/19/2011-6/24/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318721

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed total dissolved solids data for USGS California Water Science Center and determined that calendar year 2018 exceeds both the 90% and 50% upper limit, so that 1 of 1 sample exceeds the water quality objective.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: BIG SULPHUR C NR CLOVERDALE CA; station code: USG align="left" valign="top" width="33%">Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157586, Tetrachlorvinphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327061

Pollutant:

Tetrachlorvinphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Tetrachlorvinphos.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for stirophos (tetrachlorvinphos) is the USEPA Aquatic Life Benchmark of 0.125 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157586, Tetrachlorvinphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114495

Pollutant:

Tetrachlorvinphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Tetrachlorvinphos.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA expected safe lifetime exposure limit in drinking water for Tetrachlorvinphos, calculated using the IRIS Reference Dose, is 210 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.03 mg/kg/day as the reference dose.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157586, Tetrachlorvinphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114496

Pollutant:

Tetrachlorvinphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Tetrachlorvinphos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA expected safe lifetime exposure limit in drinking water for Tetrachlorvinphos, calculated using the IRIS Reference Dose, is 210 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.03 mg/kg/day as the reference dose.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157586, Tetrachlorvinphos	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327052

Pollutant:

Tetrachlorvinphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Tetrachlorvinphos.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA expected safe lifetime exposure limit in drinking water for Tetrachlorvinphos, calculated using the IRIS Reference Dose, is 210 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.03 mg/kg/day as the reference dose.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

S-11463200. Temporal Representation: This sample was collected on 6/10/2018. Environmental Conditions: QAPP Information: QAPP for USGS California Water Science Center QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 318077 Pollutant: Total Dissolved Solids LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data and determined that calendar year 2019 does not exceed either the 90% upper limit of 170 mg/L or the 50% upper limit of 150 mg/L, so that 0 of 1 sample exceeds the water quality objective for total dissolved solids. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The site specific objective is a 90% upper limit of 170 mg/L. Therefore, 90% of the values in a calendar year must be lower than this limit. In addition the site specific objective of 50% upper limit of 150 mg/L which represents the 50 percentile values of the monthly means for a calendar year applies to this water body. Therefore, 50% or more of the monthly means in a calendar year must be less than or equal to an upper limit. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: This sample was collected at sampling station name: Franz Creek at Chalk Hill Road; station code: 114FR0102. Temporal Representation: This sample was collected on 1/6/2019. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 318965 Pollutant: Total Dissolved Solids LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 1 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed total dissolved solids data for USGS California Water Science Center and determined that calendar year 2017 does not exceed either the 90% or 50% upper limit and calendar year 2018 exceeds the 50% upper limit, so that 1 of 2 samples exceed the water quality objective. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The site specific objective is a 90% upper limit of 170 mg/L. Therefore, 90% of the values in a calendar year must be lower than this limit. In addition the site specific objective of 50% upper limit of 150 mg/L which represents the 50 percentile values of the monthly means for a calendar year applies to this water body. Therefore, 50% or more of the monthly means in a calendar year must be less than or equal to an upper limit. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: These samples were collected at sampling station name: RUSSIAN R A PRESTON CA; station code: USGS-11463150. Temporal Representation: These samples were collected on 6/11/2017 and 7/8/2018. Environmental Conditions: QAPP Information: QAPP for USGS California Water Science Center QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle


DECISION ID	158777	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Toxicity
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 158777, Toxicity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

333410

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

1 of the 2 samples collected by SWAMP RWB1 Monitoring for Russian River HU, Middle Russian River HA, Geyserville HSA exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day and the same location. The following organisms and parameters were utilized for the toxicity tests: Hyalella azteca for Survival, Hyalella azteca for Growth (wt/surv indiv). The following tests exhibited toxicity: Hyalella azteca for Survival on 2019-10-17.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, bioassays of appropriate duration, or other appropriate methods as specified by the Regional Water Board (NCRWQCB 2018).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The sample is toxic when the response of the organisms exposed to the sample is significantly different (worse) than the response of the organisms exposed to the laboratory control based on statistical hypothesis testing. An exceedance is counted when the significant effect code is "Significant; Less Similarity," which means that the sample result is significantly different than the control result, and the percent effect is greater than the evaluation threshold. The default evaluation threshold is 20% unless otherwise stated.

Guideline Reference:

Short-term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Freshwater Organisms. Fourth Edition. Office of Water, U.S. Environmental Protection Agency. Washington, D.C. EPA-821-R-02-013

Spatial Representation:

The samples were collected at monitoring site: 114FR0102 ( Franz Creek at Chalk Hill Road ).

Temporal Representation:

The samples were collected between the dates of 2018-11-13 and 2019-10-17.

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 158777, Toxicity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

333412

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

0 of the 2 samples collected by SWAMP RWB1 Monitoring for Russian River HU, Middle Russian River HA, Geyserville HSA exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day and the same location. The following organisms and parameters were utilized for the toxicity tests: Ceriodaphnia dubia for Young/female, Ceriodaphnia dubia for Survival.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at monitoring site: 114FR0102 ( Franz Creek at Chalk Hill Road ).

Temporal Representation:

The samples were collected between the dates of 2019-01-06 and 2019-01-16.

DECISION ID

157613

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Thiobencarb
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114504

Pollutant:

Thiobencarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Thiobencarb.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Thiobencarb is the USEPA Aquatic Life Benchmark of 1 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327082

Pollutant:

Thiobencarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Thiobencarb.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for thiobencarb is the USEPA Aquatic Life Benchmark of 1 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114497

Pollutant:

Thiobencarb

LOE Subgroup:

Pollutant-Water

Matrix:

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 158777, Toxicity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

333420

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at monitoring site: 114FR0102 ( Franz Creek at Chalk Hill Road ).

Temporal Representation:

The samples were collected between the dates of 2019-01-06 and 2019-01-16.

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 158777, Toxicity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

333409

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at monitoring site: 114FR0102 ( Franz Creek at Chalk Hill Road ).

Temporal Representation:

The samples were collected between the dates of 2018-11-13 and 2019-10-17.

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

%">Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Thiobencarb. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Thiobencarb is the USEPA Aquatic Life Benchmark of 1 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 114498 Pollutant: Thiobencarb LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Thiobencarb. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for thiobencarb is 0.001 mg/L Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 351110 Pollutant: Thiobencarb LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed RWB1 Trend Maintenance Periods FYs 2007 2008 data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Thiobencarb. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for thiobencarb is the USEPA Aquatic Life Benchmark of 1 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road). Temporal Representation: The samples were collected between the dates of 2007-11-26 and 2008-07-14 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 351108 Pollutant: Thiobencarb LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total

DECISION ID

167523

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Trichlorfon
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167523, Trichlorfon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114512

Pollutant:

Trichlorfon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Trichlorfon.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The acceptable daily intake for Trichlorfon is 26 ug/l. This was calculated for a child assuming 10 kg body weight, 1 liter/day water consumption, 20% relative source contribution from drinking water, and 1.25 mg/kg/day as the reference dose. (National Academy of Sciences Drinking Water and Health, Volume 6, 1986)

Guideline Reference:

National Academy of Sciences Health Advisories document 1986

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167523, Trichlorfon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124162

Pollutant:

Trichlorfon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Trichlorfon, Total. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for thiobencarb is the USEPA Aquatic Life Benchmark of 1 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2007-11-26 and 2008-07-14

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114505

Pollutant:

Thiobencarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Thiobencarb.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 167523, Trichlorfon

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114513

Pollutant:

Trichlorfon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Trichlorfon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences Health Advisories document 1986

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167523, Trichlorfon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124172

Pollutant:

Trichlorfon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Trichlorfon, Total. Ten samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167523, Trichlorfon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124161

Pollutant:

Trichlorfon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Trichlorfon, Total. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327078 Pollutant: Thiobencarb LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Thiobencarb. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for thiobencarb is the USEPA Aquatic Life Benchmark of 1 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327086 Pollutant: Thiobencarb LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Thiobencarb. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for thiobencarb is 0.001 mg/L Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 43201 Pollutant: Thiobencarb/Bolero LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Thiobencarb. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for thiobencarb is 0.001 mg/L Objective/Criterion Reference: Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449. Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any


DECISION ID	158486	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Vanadium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 158486, Vanadium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329410

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentr special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124339

Pollutant:

Thiobencarb/Bolero

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Thiobencarb, Total. Forty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158486, Vanadium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329416

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

width="33%">LOE ID:

Line of Evidence (LOE) for Decision ID 158486, Vanadium

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

124340

Pollutant:

Thiobencarb/Bolero

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Thiobencarb, Total. Forty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124147

Pollutant:

Thiobencarb/Bolero

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

LOE ID:

329406

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158486, Vanadium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329417

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158486, Vanadium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329407

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158486, Vanadium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329421

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 114506 Pollutant: Thiobencarb LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Thiobencarb. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Thiobencarb is the USEPA Aquatic Life Benchmark of 1 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 114501 Pollutant: Thiobencarb LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Thiobencarb. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The evaluation guideline for Thiobencarb is the USEPA Aquatic Life Benchmark of 1 ug/L for an invertebrate (chronic). Guideline Reference: OPP Aquatic Life Benchmarks Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157613, Thiobencarb	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 114502 Pollutant: Thiobencarb LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Thiobencarb. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for thiobencarb is 0.001 mg/L Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2014-02-03 and 2014-02-03 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	157589	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Zinc
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Twenty-five lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objectives for the COLD, WARM, or MUN beneficial uses, and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

The samples were collected at 1 monitoring site(s) (114RR0898). These samples were collected at sampling station name: RUSSIAN R A ASTI CA; station code: USGS-11463400.

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114519

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327407

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Zinc.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The dissolved zinc criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 120 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA


DECISION ID	167522	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Tokuthion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167522, Tokuthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124148

Pollutant:

Tokuthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tokuthion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167522, Tokuthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124160

Pollutant:

Tokuthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tokuthion, Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167522, Tokuthion	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124149

Pollutant:

Tokuthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tokuthion, Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

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LOE ID:

114520

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114518

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43492

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for zinc is 459 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1


DECISION ID	155360	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Total Dissolved Solids
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available. BIG SULPHUR CREEK has 1 line of evidence (LOE 318721) and 1 of 1 sample exceeds the MUN beneficial use objective. FRANZ CREEK has 1 line of evidence (LOE 318077) and 0 of 1 sample exceeds the MUN beneficial use objective. RUSSIAN RIVER has twelve lines of evidence (LOEs 100828, 318472, 318949, 318479, 34917, 100827, 100873, 100875, 100871, 318965, 100874, 100872) and 5 of 20 samples exceed the objective but there is insufficient data per station to use Table 3.2 of the Listing Policy. RUSSIAN RIVER AT ALEXANDER VALLEY BRIDGE has two lines of evidence (LOEs 100828, 318472) and 1 of 3 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT ASTI has one line of evidence (LOE 318949) and 2 of 2 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT CLOVERDALE AIRPORT has one line of evidence (LOE 318479) and 1 of 1 sample exceeds the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT CROCKER ROAD has two lines of evidence (LOEs 34917, 100827) and 0 of 4 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVVER AT JOHNSON'S BEACH has one line of evidence (LOE 100873) and 0 of 3 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT MONTE RIO BEACH has one line of evidence (LOE 100875) and 0 of 2 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT ODD FELLOWS CROSSING has one line of evidence (LOE 100871) and 0 of 1 sample exceeds the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT PRESTON has one line of evidence (LOE 318965) and 1 of 2 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER BELOW VACATION BEACH has one line of evidence (LOE 100874) and 0 of 1 sample exceeds the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER NEAR KORBEL has one line of evidence (LOE 100872) and 0 of 1 sample exceeds the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:	BIG SULPHUR CREEK has 1 line of evidence (LOE 318721) and 1 of 1 sample exceeds the MUN beneficial use objective. FRANZ CREEK has 1 line of evidence (LOE 318077) and 0 of 1 sample exceeds the MUN beneficial use objective. RUSSIAN RIVER has twelve lines of evidence (LOEs 100828, 318472, 318949, 318479, 34917, 100827, 100873, 100875, 100871, 318965, 100874, 100872) and 5 of 20 samples exceed the objective but there is insufficient data per station to use Table 3.2 of the Listing Policy. RUSSIAN RIVER AT ALEXANDER VALLEY BRIDGE has two lines of evidence (LOEs 100828, 318472) and 1 of 3 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT ASTI has one line of evidence (LOE 318949) and 2 of 2 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT CLOVERDALE AIRPORT has one line of evidence (LOE 318479) and 1 of 1 sample exceeds the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT CROCKER ROAD has two lines of evidence (LOEs 34917, 100827) and 0 of 4 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVVER AT JOHNSON'S BEACH has one line of evidence (LOE 100873) and 0 of 3 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT MONTE RIO BEACH has one line of evidence (LOE 100875) and 0 of 2 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT ODD FELLOWS CROSSING has one line of evidence (LOE 100871) and 0 of 1 sample exceeds the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER AT PRESTON has one line of evidence (LOE 318965) and 1 of 2 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER BELOW VACATION BEACH has one line of evidence (LOE 100874) and 0 of 1 sample exceeds the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. RUSSIAN RIVER NEAR KORBEL has one line of evidence (LOE 100872) and 0 of 1 sample exceeds the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy.

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100827

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for specific conductance. Data range from 129 - 158 mg/L.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates 11/30/2010 - 11/30/2011

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100871

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal & DomesticGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43493

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for zinc is 459 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33124

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detri Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR1644)

Temporal Representation:

The samples were collected between the dates 12/01/2011

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100828

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for specific conductance. Data range from 213 mg/L.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Remental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples collected between 11/26/2007 and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124186

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 23 samples exceed the criterion for Zinc, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 6/22/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State opresentation:

The samples were collected between the dates 02/03/2014.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100873

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR1325).

Temporal Representation:

The samples were collected between the dates 12/01/2010 - 02/03/2014.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100874

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114523

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124175

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR1041).

Temporal Representation:

The samples were collected between the dates 08/02/2011 - 10/25/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100875

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for specific conductance. Data range from 125 - 163 mg/L.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/21/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124173

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Zinc, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Temporal Representation:

The samples were collected between the dates 08/03/2011 - 02/03/2014.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

34917

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Zero of the 2 samples exceeded the objective.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected from the Russian River at Crocker Road station (114RR5652).

Temporal Representation:

Samples were collected on the following dates: 11/26/2007 3/3/2008 4/7/2008 7/14/2008

Environmental Conditions:

QAPP Information:

N/A

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100872

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal &d align="left" valign="top" width="33%">Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43236

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124174

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR1599).

Temporal Representation:

The samples were collected between the dates 06/02/2011 - 10/25/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318949

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceed the criterion for Zinc, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Comminski Station - 114RRCOMM]

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114521

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

Temporal Representation:

These samples were collected on 6/11/2017 and 6/10/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318479

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Cloverdale Airport; station code: 114RR5407.

Temporal Representation:

These samples were from 3/5/2016-8/19/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318472

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal align="left" valign="top" width="67%">SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327392

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Zinc.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157589, Zinc

Region 1

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Alexander Valley Road; station code: 114RR4234.

Temporal Representation:

These samples were collected from 5/19/2011-6/24/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318721

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: BIG SULPHUR C NR CLOVERDALE CA; station code: USG>

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327385

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Zinc.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327390

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Zinc.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Temporal Representation:

This sample was collected on 6/10/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318077

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data and determined that calendar year 2019 does not exceed either the 90% upper limit of 170 mg/L or the 50% upper limit of 150 mg/L, so that 0 of 1 sample exceeds the water quality objective for total dissolved solids.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Franz Creek at Chalk Hill Road; station code: 114FR0102.

Temporal Representation:

This sample was collected on 1/6/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155360, Total Dissolved Solids	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318965

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed total dissolved solids data for USGS California Water Science Center and determined that calendar year 2017 does not exceed either the 90% or 50% upper limit and calendar year 2018 exceeds the 50% upper limit, so that 1 of 2 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: RUSSIAN R A PRESTON CA; station code: USGS-11463150.

Temporal Representation:

These samples were collected on 6/11/2017 and 7/8/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

ess of 100 mg/L is 120 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2016-12-15 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327441 Pollutant: Zinc LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 7 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Zinc. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The dissolved zinc criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 120 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2016-12-15 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327398 Pollutant: Zinc LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Zinc. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The dissolved zinc criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 120 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road). Temporal Representation: The samples were collected between the dates of 2019-01-16 and 2019-01-16 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327386 Pollutant: Zinc LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Zinc. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Zinc is 5 mg/L. Objective/Criterion Reference:

DECISION ID

158777

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Toxicity
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 158777, Toxicity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

333410

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at monitoring site: 114FR0102 ( Franz Creek at Chalk Hill Road ).

Temporal Representation:

The samples were collected between the dates of 2018-11-13 and 2019-10-17.

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 158777, Toxicity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

333412

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at monitoring site: 114FR0102 ( Franz Creek at Chalk Hill Road ).

Temporal Representation:

The samples were collected between the dates of 2019-01-06 and 2019-01-16.

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327427

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Zinc.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327453

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Zinc.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327417

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Zinc.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327400

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Zinc.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114517

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Zinc.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

="top" width="33%">Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 158777, Toxicity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 333420 Pollutant: Toxicity LOE Subgroup: Toxicity Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: TOXICITY TESTING Data Used to Assess Water Quality: 0 of the 2 samples collected by SWAMP RWB1 Monitoring for Russian River HU, Middle Russian River HA, Geyserville HSA exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day and the same location. The following organisms and parameters were utilized for the toxicity tests: Ceriodaphnia dubia for Young/female, Ceriodaphnia dubia for Survival. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, bioassays of appropriate duration, or other appropriate methods as specified by the Regional Water Board (NCRWQCB 2018). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The sample is toxic when the response of the organisms exposed to the sample is significantly different (worse) than the response of the organisms exposed to the laboratory control based on statistical hypothesis testing. An exceedance is counted when the significant effect code is "Significant; Less Similarity," which means that the sample result is significantly different than the control result, and the percent effect is greater than the evaluation threshold. The default evaluation threshold is 20% unless otherwise stated. Guideline Reference: Short-term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Freshwater Organisms. Fourth Edition. Office of Water, U.S. Environmental Protection Agency. Washington, D.C. EPA-821-R-02-013 Spatial Representation: The samples were collected at monitoring site: 114FR0102 ( Franz Creek at Chalk Hill Road ). Temporal Representation: The samples were collected between the dates of 2019-01-06 and 2019-01-16. Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 158777, Toxicity	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 333409 Pollutant: Toxicity LOE Subgroup: Toxicity Matrix: Sediment Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 1 Data and Information Type: TOXICITY TESTING Data Used to Assess Water Quality: 1 of the 2 samples collected by SWAMP RWB1 Monitoring for Russian River HU, Middle Russian River HA, Geyserville HSA exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day and the same location. The following organisms and parameters were utilized for the toxicity tests: Hyalella azteca for Survival, Hyalella azteca for Growth (wt/surv indiv). The following tests exhibited toxicity: Hyalella azteca for Survival on 2019-10-17. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, bioassays of appropriate duration, or other appropriate methods as specified by the Regional Water Board (NCRWQCB 2018). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: The sample is toxic when the response of the organisms exposed to the sample is significantly different (worse) than the response of the organisms exposed to the laboratory control based on statistical hypothesis testing. An exceedance is counted when the significant effect code is "Significant; Less Similarity," which means that the sample result is significantly different than the control result, and the percent effect is greater than the evaluation threshold. The default evaluation threshold is 20% unless otherwise stated. Guideline Reference: Short-term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Freshwater Organisms. Fourth Edition. Office of Water, U.S. Environmental Protection Agency. Washington, D.C. EPA-821-R-02-013 Spatial Representation: The samples were collected at monitoring site: 114FR0102 ( Franz Creek at Chalk Hill Road ). Temporal Representation: The samples were collected between the dates of 2018-11-13 and 2019-10-17. Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP


DECISION ID	104082	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	alpha-Endosulfan (Endosulfan 1)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Ten line(s) of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 104082, alpha-Endosulfan (Endosulfan 1)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116306

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan I.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for alpha-


DECISION ID	167523	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Trichlorfon
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167523, Trichlorfon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114512

Pollutant:

Trichlorfon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Trichlorfon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The acceptable daily intake for Trichlorfon is 26 ug/l. This was calculated for a child assuming 10 kg body weight, 1 liter/day water consumption, 20% relative source contribution from drinking water, and 1.25 mg/kg/day as the reference dose. (endosulfan to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 104082, alpha-Endosulfan (Endosulfan 1)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41770

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 104082, alpha-Endosulfan (Endosulfan 1)

Guideline Reference:

National Academy of Sciences Health Advisories document 1986

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167523, Trichlorfon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124162

Pollutant:

Trichlorfon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Trichlorfon, Total. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167523, Trichlorfon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114513

Pollutant:

Trichlorfon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Trichlorfon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences Health Advisories document 1986

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-05-31

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167523, Trichlorfon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124172

Pollutant:

Trichlorfon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Trichlorfon, Total. Ten samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167523, Trichlorfon	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124161

Pollutant:

Trichlorfon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Trichlorfon, Total. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

th: always">Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116303

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan I.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for alpha-endosulfan to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 104082, alpha-Endosulfan (Endosulfan 1)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116305

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan I.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for alpha-endosulfan to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 104082, alpha-Endosulfan (Endosulfan 1)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116302

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan I.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for alpha-endosulfan to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 104082, alpha-Endosulfan (Endosulfan 1)	Region 1


DECISION ID	158486	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Vanadium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 158486, Vanadium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329410

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrDDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41686

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 104082, alpha-Endosulfan (Endosulfan 1)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116304

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan I.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The establisations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158486, Vanadium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329416

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

hed numeric criteria for alpha-endosulfan to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).

Line of Evidence (LOE) for Decision ID 158486, Vanadium

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 104082, alpha-Endosulfan (Endosulfan 1)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41546

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 104082, alpha-Endosulfan (Endosulfan 1)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116307

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan I.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for alpha-endosulfan to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 104082, alpha-Endosulfan (Endosulfan 1)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41529

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

LOE ID: 329406 Pollutant: Vanadium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Vanadium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Drinking water notification levels are published by the Division of Drinking Water and are for chemicals for which there is no drinking water MCL. If a notification level is exceeded, local government notification is required and customer notification is recommended. The criteria for Vanadium is 0.05 mg/L. Guideline Reference: Drinking Water Notification and Response Levels: An Overview Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158486, Vanadium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 329417 Pollutant: Vanadium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Agricultural Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Vanadium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water Guideline Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158486, Vanadium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 329407 Pollutant: Vanadium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Vanadium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Drinking water notification levels are published by the Division of Drinking Water and are for chemicals for which there is no drinking water MCL. If a notification level is exceeded, local government notification is required and customer notification is recommended. The criteria for Vanadium is 0.05 mg/L. Guideline Reference: Drinking Water Notification and Response Levels: An Overview Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158486, Vanadium	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 329421 Pollutant: Vanadium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Agricultural Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Vanadium. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water Guideline Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle


DECISION ID	104040	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	alpha.-BHC (Benzenehexachloride or alpha-HCH)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Three line(s) of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 104040, alpha.-BHC (Benzenehexachloride or alpha-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123993

Pollutant:

alpha.-BHC (Benzenehexachloride or alpha-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for HCH, alpha-, Total. Seventy-nine sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 104040, alpha.-BHC (Benzenehexachloride or alpha-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123994

Pollutant:

alpha.-BHC (Benzenehexachloride or alpha-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for HCH, alpha-, Total. Twenty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 104040, alpha.-BHC (Benzenehexachloride or alpha-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123981

Pollutant:

alpha.-BHC (Benzenehexachloride or alpha-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for HCH, alpha-, Total. Seventy-nine sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	157589	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Zinc
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Twenty-five lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objectives for the COLD, WARM, or MUN beneficial uses, and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114519

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:


DECISION ID	167484	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	beta-Endosulfan (Endosulfan 2)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Objective/Criterion Reference:

Line of Evidence (LOE) for Decision ID 167484, beta-Endosulfan (Endosulfan 2)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116312

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan II.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for beta-endosulfan to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327407

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Zinc.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 167484, beta-Endosulfan (Endosulfan 2)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116310

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan II.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for beta-endosulfan to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167484, beta-Endosulfan (Endosulfan 2)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41598

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

LOE ID:

114520

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114518

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167484, beta-Endosulfan (Endosulfan 2)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116314

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan II.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for beta-endosulfan to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43492

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for zinc is 459 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

GHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157589, Zinc

Region 1

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167484, beta-Endosulfan (Endosulfan 2)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41626

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167484, beta-Endosulfan (Endosulfan 2)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41561

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

LOE ID:

43493

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for zinc is 459 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33124

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for zinc.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detri

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167484, beta-Endosulfan (Endosulfan 2)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116309

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan II.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for beta-endosulfan to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples collected between 11/26/2007 and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124186

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 23 samples exceed the criterion for Zinc, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 6/22/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State otop" width="67%">

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167484, beta-Endosulfan (Endosulfan 2)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116313

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan II.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167484, beta-Endosulfan (Endosulfan 2)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41620

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167484, beta-Endosulfan (Endosulfan 2)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116308

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan II.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for beta-endosulfan to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

f California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114523

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124175

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:


DECISION ID	167490	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	cis-Nonachlor
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167490, cis-Nonachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124110

Pollutant:

cis-Nonachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Nonachlor, cis-, Total. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter grated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/21/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124173

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Zinc, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167490, cis-Nonachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124120

Pollutant:

cis-Nonachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Nonachlor, cis-, Total. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167490, cis-Nonachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124121

Pollutant:

cis-Nonachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Nonachlor, cis-, Total. Ten samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

d align="left" valign="top" width="33%">Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43236

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124174

DECISION ID

167515

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	p,p'-DDMU
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167515, p,p'-DDMU	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124103

Pollutant:

p,p'-DDMU

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDMU(p,p'), Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceed the criterion for Zinc, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Comminski Station - 114RRCOMM]

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114521

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167515, p,p'-DDMU	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124102

Pollutant:

p,p'-DDMU

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDMU(p,p'), Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167515, p,p'-DDMU	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124104

Pollutant:

p,p'-DDMU

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDMU(p,p'), Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

align="left" valign="top" width="67%">SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Zinc is 5 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-09-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327392 Pollutant: Zinc LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Zinc. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Zinc is 5 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327385 Pollutant: Zinc LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Zinc. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The dissolved zinc criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 120 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road). Temporal Representation: The samples were collected between the dates of 2019-01-16 and 2019-01-16 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 327390 Pollutant: Zinc LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 6 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Zinc. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: The dissolved zinc criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardn


DECISION ID	155359	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	pH
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Twenty-eight lines of evidence are available in the administrative record to assess this pollutant. Eight of the 428 samples exceed the Objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Eight of the 428 samples exceed the Objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100868

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 9 samples exceeded the water quality standard for pH. Data range from 7.9 - 8.1.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: The pH shall conform to the values listed in Table 3-1 which states that the water quality objective for pH shall not be depressed below 6.5 or raised above 8.5.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR2599)

Temporal Representation:

The samples were collected between the dates 06/07/2011 - 10/24/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100890

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for pH. Data range from 8.1.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114PS0229).

Temporal Representation:

The samples were collected between the dates 06/04/2014.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327441

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Zinc.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE IDd align="left" valign="top" width="67%">100864

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for pH. Data range from 7.9 - 8.2.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR2899)

Temporal Representation:

The samples were collected between the dates 06/01/2011 - 10/24/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100893

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for pH. Data range from 8.1 - 8.2.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Bas:

327398

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Zinc.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327386

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Zinc.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114CR0903).

Temporal Representation:

The samples were collected between the dates 08/26/2013 - 09/25/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100863

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 25 samples exceeded the water quality standard for pH. Data range from 7.4 - 8.4.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR2940_SWAMP)

Temporal Representation:

The samples were collected between the dates 09/28/2010 - 02/03/2014.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100862

Pollutant:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327427

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Zinc.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327453

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Watth="67%">pH

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 20 samples exceeded the water quality standard for pH. Data range from 7.8 - 8.4.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR3119_SWAMP)

Temporal Representation:

The samples were collected between the dates 05/19/2011 - 10/04/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100866

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for pH. Data range from 7.9.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Zinc.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327417

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Zinc.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327400

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Zinc.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157589, Zinc	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

114517

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Zinc.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

="top" width="67%"> Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR2769) Temporal Representation: The samples were collected between the dates 06/01/2011. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 100861 Pollutant: pH LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 19 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 19 samples exceeded the water quality standard for pH. Data range from 7.7 - 8.0. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: The pH shall conform to the values listed in Table 3-1 which states that the water quality objective for pH shall not be depressed below 6.5 or raised above 8.5. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4751_SWAMP) Temporal Representation: The samples were collected between the dates 05/26/2011 - 10/06/2011. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 100870 Pollutant: pH LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 19 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 19 samples exceeded the water quality standard for pH. Data range from 7.8 - 8.1. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: The pH shall conform to the values listed in Table 3-1 which states that the water quality objective for pH shall not be depressed below 6.5 or raised above 8.5. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR1898) Temporal Representation: The samples were collected between the dates 05/24/2011 - 10/04/2011. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 318453 Pollutant: pH LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 1 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed pH data for SWAMP Perennial Stream Surveys and determined that 0 sample is less than pH 6.5 and 1 sample is greater than pH 8.5, so that 1 of 1 sample exceeds the water quality objective. Data Reference: Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: The pH shall conform to the values listed in Table 3-1 which states that the water quality objective for pH shall not be depressed below 6.5 or raised above 8.5. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference:

DECISION ID

104082

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	alpha-Endosulfan (Endosulfan 1)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Ten line(s) of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 104082, alpha-Endosulfan (Endosulfan 1)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116306

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan I.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 104082, alpha-Endosulfan (Endosulfan 1)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41770

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 104082, alpha-Endosulfan (Endosulfan 1)

Spatial Representation:

This sample was collected at sampling station name: Russian River ~1.1mi above Crocker Cr.; station code: 114PS0289.

Temporal Representation:

This sample was collected on 7/6/2015.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Perennial Stream Surveys

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100859

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR6273_SWAMP)

Temporal Representation:

The samples were collected between the dates 05/26/2011 - 10/06/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100867

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR2678)

Temporal Representation:

The samples were collected between the dates 06/29/2011 - 11/29/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

34209

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

One of the 4 samples exceeded the objective.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the lower limit pH for this water body is 6.5, and the upper limit pH for this water body is 8.5.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Russian River at Crocker Road station (114RR5652).

Temporal Representation:

Samples were collected approximately once per quarter year from November 2007 to July 2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116303

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan I.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 104082, alpha-Endosulfan (Endosulfan 1)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116305

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan I.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for alpha-endosulfan to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 104082, alpha-Endosulfan (Endosulfan 1)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116302

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan I.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for alpha-endosulfan to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 104082, alpha-Endosulfan (Endosulfan 1)

Region 1

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318484

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed pH data for SWAMP RWB1 Monitoring and determined that 0 samples are less than pH 6.5 and 0 samples are greater than pH 8.5, so that 0 of 2 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Del Rio Woods Park; station code: 114RR3173,

Temporal Representation:

These samples were collected from 8/24/2015-7/20/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ froDDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318502

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed pH data for SWAMP RWB1 Monitoring and determined that 0 samples are less than pH 6.5 and 0 samples are greater than pH 8.5, so that 0 of 20 samples exceed the water quality objective.

Data Reference:

LOE ID:

41686

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 104082, alpha-Endosulfan (Endosulfan 1)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116304

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan I.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The establism the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Highway 128; station code: 114RR4751.

Temporal Representation:

These samples were collected from 5/26/2011-10/6/2011.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318482

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed pH data for SWAMP RWB1 Monitoring and determined that 0 samples are less than pH 6.5 and 0 samples are greater than pH 8.5, so that 0 of 24 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Crocker Road; station code: 114RR5652.

Temporal Representation:

These samples were collected from 6/6/2012-7/20/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH

Region 1

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 104082, alpha-Endosulfan (Endosulfan 1)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41546

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 104082, alpha-Endosulfan (Endosulfan 1)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116307

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan I.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for alpha-endosulfan to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 104082, alpha-Endosulfan (Endosulfan 1)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41529

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 318480 Pollutant: pH LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 16 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed pH data for SWAMP RWB1 Monitoring and determined that 0 samples are less than pH 6.5 and 0 samples are greater than pH 8.5, so that 0 of 16 samples exceed the water quality objective. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: The pH shall conform to the values listed in Table 3-1 which states that the water quality objective for pH shall not be depressed below 6.5 or raised above 8.5. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: These samples were collected at sampling station name: Russian River at Cloverdale River Park; station code: 114RR5748. Temporal Representation: These samples were collected from 5/21/2012-8/24/2015. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 318477 Pollutant: pH LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 34 Number of Exceedances: 2 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed pH data for SWAMP RWB1 Monitoring and determined that 0 samples are less than pH 6.5 and 2 samples are greater than pH 8.5, so that 2 of 34 samples exceed the water quality objective. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: The pH shall conform to the values listed in Table 3-1 which states that the water quality objective for pH shall not be depressed below 6.5 or raised above 8.5. Objective/Criterion Reference:

DECISION ID

104040

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	alpha.-BHC (Benzenehexachloride or alpha-HCH)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Three line(s) of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 104040, alpha.-BHC (Benzenehexachloride or alpha-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123993

Pollutant:

alpha.-BHC (Benzenehexachloride or alpha-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for HCH, alpha-, Total. Seventy-nine sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Cloverdale Airport; station code: 114RR5407.

Temporal Representation:

These samples were from 3/5/2016-8/19/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318473

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed pH data for SWAMP RWB1 Monitoring and determined that 0 samples are less than pH 6.5 and 1 sample is greater than pH 8.5, so that 1 of 62 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Camp Rose Beach; station code: 114RR3119.

Temporal Representation:

These samples were collected from 5/19/2011-7/20/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318470

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 104040, alpha.-BHC (Benzenehexachloride or alpha-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123994

Pollutant:

alpha.-BHC (Benzenehexachloride or alpha-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for HCH, alpha-, Total. Twenty sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 104040, alpha.-BHC (Benzenehexachloride or alpha-HCH)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

123981

Pollutant:

alpha.-BHC (Benzenehexachloride or alpha-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for HCH, alpha-, Total. Seventy-nine sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

"top" width="33%">Beneficial Use: Cold Freshwater Habitat Number of Samples: 82 Number of Exceedances: 1 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed pH data from SWAMP RWB1 Monitoring and determined that 0 samples are less than pH 6.5 and 1 sample is greater than pH 8.5, so that 1 of 82 samples exceed the water qualtiy objective. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: The pH shall conform to the values listed in Table 3-1 which states that the water quality objective for pH shall not be depressed below 6.5 or raised above 8.5. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: These samples were collected at sampling station name: Russian River at Alexander Valley Road; station code: 114RR4234. Temporal Representation: These samples were collected from 5/19/2011-6/24/2019. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 318979 Pollutant: pH LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 1 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed pH data for EPA National Aquatic Resources Survey (NARS) and determined that 1 sample is less than the minimum of pH 6.5 and 0 samples are greater than the maximum of pH 8.5, so that 1 of 4 samples exceed the water quality objective. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: The pH shall conform to the values listed in Table 3-1 which states that the water quality objective for pH shall not be depressed below 6.5 nor raised above 8.5. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: These samples were collected at sampling station name: Russian River; station code: NARS_WQX-CAR9-0903. Temporal Representation: These samples were collected on 8/26/2913 and 9/25/2013. Environmental Conditions: QAPP Information: QAPP for EPA National Aquatic Resources Survey (NARS) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 317913 Pollutant: pH LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 9 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed data from parent project SWAMP RWB1 Monitoring and determined that 0 of 9 samples were less than pH 6.5 and 0 of 9 samples were greater than pH 8.5, so that 0 of 9 samples exceed the water quality objective for pH. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: The pH shall conform to the values listed in Table 3-1 which states that the water quality objective for pH shall not be depressed below 6.5 or raised above 8.5. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: These samples were collected at sampling station name: Big Sulphur Creek at River Road; station code: 114BS0310. Temporal Representation: These samples were collected from 12/15/2016-12/20/2017. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 318075 Pollutant: pH LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data and determined that 0 samples were less than pH 6.5 and 0 samples were greater than 8.5, so that 0 of 1 sample exceeds the water qualit


DECISION ID	167484	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	beta-Endosulfan (Endosulfan 2)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

in, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: The pH shall conform to the values listed in Table 3-1 which states that the water quality objective for pH shall not be depressed below 6.5 or raised above 8.5.

Line of Evidence (LOE) for Decision ID 167484, beta-Endosulfan (Endosulfan 2)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116312

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan II.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for beta-endosulfan to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167484, beta-Endosulfan (Endosulfan 2)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116310

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan II.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for beta-endosulfan to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167484, beta-Endosulfan (Endosulfan 2)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41598

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Franz Creek at Chalk Hill Road; station code: 114FR0102.

Temporal Representation:

This sample was collected on 1/6/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318259

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed pH data for SWAMP RWB1 Monitoring and determined that 0 samples are less than pH 6.5 and 0 samples are greater than pH 8.5, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Lytton Creek at Russian River; station code: 114LY0010.

Temporal Representation:

This sample was collected on 3/5/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100865

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 8 samples exceeded the water quality standard for pH. Data range from 7.7 - 8.2.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR2861)

Temporal Representation:

The samples were collected between the dates 06/07/2011 - 10/24/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100869

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Bas width="67%">Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167484, beta-Endosulfan (Endosulfan 2)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116314

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan II.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for beta-endosulfan to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167484, beta-Endosulfan (Endosulfan 2)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41626

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167484, beta-Endosulfan (Endosulfan 2)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41561

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR2036)

Temporal Representation:

The samples were collected between the dates 05/19/2011 - 02/03/2014.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

6210

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

One of the 2 pH samples collected in Foss Creek exceeds the specific conductivity water quality objective. The sample concentrations range from 6.3 to 3.8 uS. The samples were collected as part of the Russian River First Flush sampling event. Data are summarized by Katznelson et al. (2003).

Data Reference:

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): The maximum pH objective is 8.5. The minimum pH objective is 6.5.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from 2 sites in Foss Creek as follows: (1) in Foss Creek in downtown Healdsburg, and (2) in Upper Foss Creek.

Temporal Representation:

The samples were collected on November 7, 2002. At each site, 3 instantaneous grab samples were collected over half hour increments. The data are averaged for each site.

Environmental Conditions:

Samples were collected during the first runoff event of the rainy season.

QAPP Information:

Samples were collected in accordance with the study plan and quality control procedures described by Katznelson et al. (2003).

QAPP Information Reference(s):

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100860

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates 09/28/2010 - 11/30/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan II. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-endosulfan to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167484, beta-Endosulfan (Endosulfan 2)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116309 Pollutant: beta-Endosulfan (Endosulfan 2) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan II. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The established numeric criteria for beta-endosulfan to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167484, beta-Endosulfan (Endosulfan 2)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116313 Pollutant: beta-Endosulfan (Endosulfan 2) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan II. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The established numeric criteria for beta-endosulfan to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 167484, beta-Endosulfan (Endosulfan 2)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 41620 Pollutant: beta-Endosulfan (Endosulfan 2) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan II. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-endosulfan to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 167484, beta-Endosulfan (Endosulfan 2)	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116308 Pollutant: beta-Endosulfan (Endosulfan 2) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Endosulfan II. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: The established numeric criteria for beta-endosulfan to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-11-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	167490	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	cis-Nonachlor
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167490, cis-Nonachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124110

Pollutant:

cis-Nonachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Nonachlor, cis-, Total. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167490, cis-Nonachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124120

Pollutant:

cis-Nonachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Nonachlor, cis-, Total. Forty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167490, cis-Nonachlor	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124121

Pollutant:

cis-Nonachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Nonachlor, cis-, Total. Ten samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	167515	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	p,p'-DDMU
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Listing Extent:

Line of Evidence (LOE) for Decision ID 167515, p,p'-DDMU	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124103

Pollutant:

p,p'-DDMU

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA3 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDMU(p,p'), Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA3 was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167515, p,p'-DDMU	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124102

Pollutant:

p,p'-DDMU

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA4 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDMU(p,p'), Total. Twenty samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA4 was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 2/6/2002-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 167515, p,p'-DDMU	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124104

Pollutant:

p,p'-DDMU

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA1 to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDMU(p,p'), Total. Five samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29953 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA1 was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	155359	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	pH
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Twenty-eight lines of evidence are available in the administrative record to assess this pollutant. Eight of the 428 samples exceed the Objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Eight of the 428 samples exceed the Objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100868

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR2599)

Temporal Representation:

The samples were collected between the dates 06/07/2011 - 10/24/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100890

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for pH. Data range from 8.1.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114PS0229).

Temporal Representation:

The samples were collected between the dates 06/04/2014.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100864

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR2899)

Temporal Representation:

The samples were collected between the dates 06/01/2011 - 10/24/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100893

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114CR0903).

Temporal Representation:

The samples were collected between the dates 08/26/2013 - 09/25/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100863

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR2940_SWAMP)

Temporal Representation:

The samples were collected between the dates 09/28/2010 - 02/03/2014.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100862

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR3119_SWAMP)

Temporal Representation:

The samples were collected between the dates 05/19/2011 - 10/04/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100866

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for pH. Data range from 7.9.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR2769)

Temporal Representation:

The samples were collected between the dates 06/01/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100861

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 19 samples exceeded the water quality standard for pH. Data range from 7.7 - 8.0.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4751_SWAMP)

Temporal Representation:

The samples were collected between the dates 05/26/2011 - 10/06/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100870

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR1898)

Temporal Representation:

The samples were collected between the dates 05/24/2011 - 10/04/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318453

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed pH data for SWAMP Perennial Stream Surveys and determined that 0 sample is less than pH 6.5 and 1 sample is greater than pH 8.5, so that 1 of 1 sample exceeds the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Russian River ~1.1mi above Crocker Cr.; station code: 114PS0289.

Temporal Representation:

This sample was collected on 7/6/2015.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Perennial Stream Surveys

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100859

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR6273_SWAMP)

Temporal Representation:

The samples were collected between the dates 05/26/2011 - 10/06/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100867

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR2678)

Temporal Representation:

The samples were collected between the dates 06/29/2011 - 11/29/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

34209

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

One of the 4 samples exceeded the objective.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the lower limit pH for this water body is 6.5, and the upper limit pH for this water body is 8.5.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Russian River at Crocker Road station (114RR5652).

Temporal Representation:

Samples were collected approximately once per quarter year from November 2007 to July 2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318484

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Del Rio Woods Park; station code: 114RR3173,

Temporal Representation:

These samples were collected from 8/24/2015-7/20/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318502

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Highway 128; station code: 114RR4751.

Temporal Representation:

These samples were collected from 5/26/2011-10/6/2011.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318482

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Crocker Road; station code: 114RR5652.

Temporal Representation:

These samples were collected from 6/6/2012-7/20/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318480

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed pH data for SWAMP RWB1 Monitoring and determined that 0 samples are less than pH 6.5 and 0 samples are greater than pH 8.5, so that 0 of 16 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Cloverdale River Park; station code: 114RR5748.

Temporal Representation:

These samples were collected from 5/21/2012-8/24/2015.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318477

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed pH data for SWAMP RWB1 Monitoring and determined that 0 samples are less than pH 6.5 and 2 samples are greater than pH 8.5, so that 2 of 34 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Cloverdale Airport; station code: 114RR5407.

Temporal Representation:

These samples were from 3/5/2016-8/19/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318473

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Camp Rose Beach; station code: 114RR3119.

Temporal Representation:

These samples were collected from 5/19/2011-7/20/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318470

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed pH data from SWAMP RWB1 Monitoring and determined that 0 samples are less than pH 6.5 and 1 sample is greater than pH 8.5, so that 1 of 82 samples exceed the water qualtiy objective.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Alexander Valley Road; station code: 114RR4234.

Temporal Representation:

These samples were collected from 5/19/2011-6/24/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318979

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed pH data for EPA National Aquatic Resources Survey (NARS) and determined that 1 sample is less than the minimum of pH 6.5 and 0 samples are greater than the maximum of pH 8.5, so that 1 of 4 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River; station code: NARS_WQX-CAR9-0903.

Temporal Representation:

These samples were collected on 8/26/2913 and 9/25/2013.

Environmental Conditions:

QAPP Information:

QAPP for EPA National Aquatic Resources Survey (NARS)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

317913

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project SWAMP RWB1 Monitoring and determined that 0 of 9 samples were less than pH 6.5 and 0 of 9 samples were greater than pH 8.5, so that 0 of 9 samples exceed the water quality objective for pH.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Big Sulphur Creek at River Road; station code: 114BS0310.

Temporal Representation:

These samples were collected from 12/15/2016-12/20/2017.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318075

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data and determined that 0 samples were less than pH 6.5 and 0 samples were greater than 8.5, so that 0 of 1 sample exceeds the water quality objective for pH.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Franz Creek at Chalk Hill Road; station code: 114FR0102.

Temporal Representation:

This sample was collected on 1/6/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318259

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Lytton Creek at Russian River; station code: 114LY0010.

Temporal Representation:

This sample was collected on 3/5/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100865

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR2861)

Temporal Representation:

The samples were collected between the dates 06/07/2011 - 10/24/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100869

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR2036)

Temporal Representation:

The samples were collected between the dates 05/19/2011 - 02/03/2014.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

6210

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): The maximum pH objective is 8.5. The minimum pH objective is 6.5.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from 2 sites in Foss Creek as follows: (1) in Foss Creek in downtown Healdsburg, and (2) in Upper Foss Creek.

Temporal Representation:

The samples were collected on November 7, 2002. At each site, 3 instantaneous grab samples were collected over half hour increments. The data are averaged for each site.

Environmental Conditions:

Samples were collected during the first runoff event of the rainy season.

QAPP Information:

Samples were collected in accordance with the study plan and quality control procedures described by Katznelson et al. (2003).

QAPP Information Reference(s):

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

Line of Evidence (LOE) for Decision ID 155359, pH	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

100860

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates 09/28/2010 - 11/30/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	157616	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Anatoxin-A
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. *MUNICIPAL & DOMESTIC SUPPLY BENEFICIAL USE RUSSIAN RIVER has one line of evidence (LOE 323612) and 4 of 10 samples exceed the objective, which exceeds the allowable frequency in Table 3.1 of the Listing Policy. *WATER CONTACT RECREATION BENEFICIAL USE RUSSIAN RIVER has one line of evidence (LOE 323587) and 2 of 10 samples exceed the objective, which exceeds the allowable frequency in Table 3.1 of the Listing Policy. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. The Municipal & Domestic Supply beneficial use has one line of evidence and 4 of 10 samples exceed the objective. The Water Contact Recreation beneficial use has one line of evidence and 2 of 10 samples exceed the objective. This exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. This listing applies to the mainstem Russian River.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:	This listing applies to the mainstem Russian River.

Line of Evidence (LOE) for Decision ID 157616, Anatoxin-A	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323587

Pollutant:

Anatoxin-A

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 10 samples exceeded the water quality threshold for Anatoxin-A.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 20 ug/L of anatoxin-A as the water concentration protective of swimmers and other contact recreational users including water-skiing/jet-skiing, fishing, boating, sail boarding, and canoeing.

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2017-05-24 and 2017-10-17

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157616, Anatoxin-A	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323612

Pollutant:

Anatoxin-A

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 4 of 10 samples exceeded the water quality threshold for Anatoxin-A.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for anatoxin-A for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.7 ug/L.

Guideline Reference:

Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2017-05-24 and 2017-10-17

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1


DECISION ID	157616	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Anatoxin-A
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. *MUNICIPAL & DOMESTIC SUPPLY BENEFICIAL USE RUSSIAN RIVER has one line of evidence (LOE 323612) and 4 of 10 samples exceed the objective, which exceeds the allowable frequency in Table 3.1 of the Listing Policy. *WATER CONTACT RECREATION BENEFICIAL USE RUSSIAN RIVER has one line of evidence (LOE 323587) and 2 of 10 samples exceed the objective, which exceeds the allowable frequency in Table 3.1 of the Listing Policy. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. The Municipal & Domestic Supply beneficial use has one line of evidence and 4 of 10 samples exceed the objective. The Water Contact Recreation beneficial use has one line of evidence and 2 of 10 samples exceed the objective. This exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. This listing applies to the mainstem Russian River.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:	This listing applies to the mainstem Russian River.

Line of Evidence (LOE) for Decision ID 157616, Anatoxin-A	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323587

Pollutant:

Anatoxin-A

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 10 samples exceeded the water quality threshold for Anatoxin-A.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2017-05-24 and 2017-10-17

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157616, Anatoxin-A	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323612

Pollutant:

Anatoxin-A

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 4 of 10 samples exceeded the water quality threshold for Anatoxin-A.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for anatoxin-A for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.7 ug/L.

Guideline Reference:

Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2017-05-24 and 2017-10-17

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1


DECISION ID	169332	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Benthic Community Effects
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Benthic Community Effects are being considered for placement on the CWA section 303(d) List under sections 3.9 of the Listing Policy. Under section 3.9, additional lines of evidence (LOEs) associating the Benthic Community Effects decision with a water or sediment concentration of pollutants other than benthic-macroinvertebrate bioassessment or habitat assessment LOEs are necessary to place a water body on the 303(d) List for Benthic Community Effects. Three line(s) of evidence evaluating benthic-macroinvertebrate bioassessment data is/are available in the administrative record to assess this indicator. Two of 3 benthic-macroinvertebrate samples exceed the California Stream Condition Index (CSCI) impairment threshold. Additionally, there are associated pollutant impairments on the waterbody (including but not necessarily limited to Copper, Diazinon, Aluminum, Dissolved Oxygen, Temperature, and Turbidity). Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for placing Benthic Community Effects in this waterbody segment on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 2 of 3 benthic-macroinvertebrate bioassessment samples had CSCI scores below 0.79. Therefore, this water body is exceeding the water quality threshold for the protection of the WARM and/or COLD beneficial use. 4. Pursuant to section 3.9 of the Listing Policy, the water segment has associated pollutant(s) samples that exceed water quality objectives. 5. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

Listing Extent:

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324526

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:


DECISION ID	169332	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Benthic Community Effects
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Benthic Community Effects are being considered for placement on the CWA section 303(d) List under sections 3.9 of the Listing Policy. Under section 3.9, additional lines of evidence (LOEs) associating the Benthic Community Effects decision with a water or sediment concentration of pollutants other than benthic-macroinvertebrate bioassessment or habitat assessment LOEs are necessary to place a water body on the 303(d) List for Benthic Community Effects. Three line(s) of evidence evaluating benthic-macroinvertebrate bioassessment data is/are available in the administrative record to assess this indicator. Two of 3 benthic-macroinvertebrate samples exceed the California Stream Condition Index (CSCI) impairment threshold. Additionally, there are associated pollutant impairments on the waterbody (including but not necessarily limited to Copper, Diazinon, Aluminum, Dissolved Oxygen, Temperature, and Turbidity). Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for placing Benthic Community Effects in this waterbody segment on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 2 of 3 benthic-macroinvertebrate bioassessment samples had CSCI scores below 0.79. Therefore, this water body is exceeding the water quality threshold for the protection of the WARM and/or COLD beneficial use. 4. Pursuant to section 3.9 of the Listing Policy, the water segment has associated pollutant(s) samples that exceed water quality objectives. 5. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

Listing Extent:

3 Number of Samples: Benthic macroinvertebrate surveys >Water Quality Control Plan (Basin Plan) for the North Coast RegionMONITORING" valign="top" width="67%">SWAMP QAPrP ords/region_1/2018/ref4527.pdf" >Water Quality Control Plan (Basin Plan) for the North Coast RegionGuideline Reference:

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324526

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Diazinon.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116282

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Diazinon.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116280

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Diazinon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116277

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Diazinon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43584

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was coll

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Diazinon.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116282

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Diazinon.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116280

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Diazinon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116277

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Diazinon.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-11-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43584

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41277

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

As stated in CDFG documents from Siepmann and Finlayson, the 4-day freshwater continuous criterion concentration for diazinon is 0.10 µg/L.

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43585

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324528

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Diazinon.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.10ected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41277

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

As stated in CDFG documents from Siepmann and Finlayson, the 4-day freshwater continuous criterion concentration for diazinon is 0.10 µg/L.

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43585

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324528

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Diazinon.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.10 ug/L (4 day average)(Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41283

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

4764

Pollutant:

Sedimentation/Siltation

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

Unspecified

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108340

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Copper.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2014-02-03 and 2014-02-03

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41283

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328281

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved copper criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 9 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43640

Pollutant:

Copper

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

4764

Pollutant:

Sedimentation/Siltation

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

Unspecified

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108340

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Copper.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for copper is 149 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108339

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328281

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43640

Pollutant:

Copper

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328273

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

34132

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for copper is 149 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108339

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)4

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples collected exceeded the objective.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The site specific objective for the mainstem Russian River above the Laguna de Santa Rosa is a minimum value of 7.0 mg/L. In addition, the 90% lower limit for this pollutant is 7.5 mg/L. Therefore, 90% of the values in a calendar year must be lower than this limit. Lastly, the site specific objective of 50% lower limit of 10 mg/L which represents the 50 percentile values of the monthly means for a calendar year applies to this water body. Therefore, 50% or more of the monthly means in a calendar year must be less than or equal to an upper limit.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Russian River at Crocker Road station (114RR5652).

Temporal Representation:

Samples were collected approximately once per quarter year from November 2007 to July 2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

32637

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Six of the 18 samples had a DO concentration below 7 mg/L.

Data Reference:

Data for Bacteria and Nutrient in Sonoma County Water Agency, 2009-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The minimum dissolved oxygen objective is 7.0 mg/L. The 90% lower limit dissolved oxygen objective is 7.5 mg/L. The 50% lower limit dissolved oxygen objective is 10.0 mg/L. The 90% and 50% lower limits represent the 90/50 percentile values for a calendar year. 90% or 50% or more of the values must be greater than or equal to the lower limit.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at three different locations: Cloverdale River Park (Russian River at Cloverdale River Park Geyserville Bridge), Russian River at Highway 128, and Russian River at Alexander Valley Campground.

Temporal Representation:

Samples collected between 5/28/2009 and 10/1/2009.

Environmental Conditions:

QAPP Information:

Per the Sonoma County Water Agency (SCWA) the data are provisional and may contain inaccuracies as they have not gone through QA procedures.

QAPP Information Reference(s):

Quality Assurance Project Plan for Region One for Bacteriological Sampling.

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326153

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for COLD beneficial use waters to be a daily minimum of 6.0 mg/L and a 7-day moving average of 8.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5748 (Russian River at Cloverdale River Park).

Temporal Representation:

The samples were collected between the dates of 2012-05-21 and 2015-08-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328870

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328273

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

34132

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326280

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples collected exceeded the objective.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Russian River at Crocker Road station (114RR5652).

Temporal Representation:

Samples were collected approximately once per quarter year from November 2007 to July 2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

32637

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Six of the 18 samples had a DO concentration below 7 mg/L.

Data Reference:

Data for Bacteria and Nutrient in Sonoma County Water Agency, 2009-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Samples collected between 5/28/2009 and 10/1/2009.

Environmental Conditions:

QAPP Information:

Per the Sonoma County Water Agency (SCWA) the data are provisional and may contain inaccuracies as they have not gone through QA procedures.

QAPP Information Reference(s):

Quality Assurance Project Plan for Region One for Bacteriological Sampling.

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326153

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5748 (Russian River at Cloverdale River Park).

Temporal Representation:

The samples were collected between the dates of 2012-05-21 and 2015-08-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328870

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

ww.waterboards.ca.gov/water_issues/programs/tmdl/records/state_board/2023/ref6541.pdf" >SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326089

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3173 (Russian River at Del Rio Woods Park).

Temporal Representation:

The samples were collected between the dates of 2015-08-24 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104957

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326280

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR3119_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-06-14 and 2011-10-04

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111597

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111607

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 19 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5748)

Temporal Representation:

The samples were collected between the dates of 2011-05-26 and 2011-10-06

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326270

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326089

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3173 (Russian River at Del Rio Woods Park).

Temporal Representation:

The samples were collected between the dates of 2015-08-24 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104957

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Oxygen, Dissolved.

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2012-06-06 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323206

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Ref width="33%">Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR3119_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-06-14 and 2011-10-04

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111597

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323239

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323199

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111607

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 19 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5748)

Temporal Representation:

The samples were collected between the dates of 2011-05-26 and 2011-10-06

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326270

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 3 of 6 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327881

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The aluminum criterion for the protection of aquatic life, is pH, total hardness, and dissolved organic carbon (DOC) dependent. When total hardness or DOC data were not available, default values based on the level III ecoregions developed by U.S EPA were substituted (EPA, 2018). When pH data were not available, the median pH value for the ecoregion, a pH value from a comparable waterbody, or a pH value from a local study ca.gov/water_issues/programs/tmdl/records/region_1/2022/ref5888.xlsx">Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2012-06-06 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323206

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Refin the same waterbody was used as a comparable surrogate.

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323153

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects

Region 1

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323239

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323199

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323182

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323180

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 3 of 6 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327881

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327891

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:in the same waterbody was used as a comparable surrogate.

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323153

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects

Region 1

QAPP not required for USGS projects

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323186

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327892

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323182

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323180

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323216

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327891

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:s developed by U.S EPA were substituted (EPA, 2018). When pH data were not available, the median pH value for the ecoregion, a pH value from a comparable waterbody, or a pH value from a local study in the same waterbody was used as a comparable surrogate.

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323214

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects

Region 1 &

QAPP not required for USGS projects

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323186

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-16 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327892

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

352595

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for 114PS0289 to determine beneficial use support and the results are as follows: 1 of 1 samples exceeded the water quality standard. CSCI scores were from 0.724274158 to 0.724274158 .

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Stream Condition Index (CSCI) is a biological scoring tool that helps aquatic resource managers translate complex data about benthic macroinvertebrates found living in a stream into an overall measure of stream health. The CSCI score is calculated by comparing the expected condition with actual (observed) results (Rhen, A.C. et al., 2015). CSCI scores range from 0 (highly degraded) to greater than 1 (equivalent to reference). CSCI scoring of biological condition are as follows (per the scientific paper supporting the development of the CSCI scoring tool): greater than or equal to 0.92 = likely intact condition, 0.91 to 0.80 = possibly altered condition, 0.79 to 0.63 = likely altered condition, less than or equal to 0.62 = very likely altered condition. Sites with scores below 0.79 are considered to have exceeded the water quality objective for the aquatic life beneficial use.)

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

Samples were collected from 2015-07-06 to 2015-07-06.

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

353511

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323216

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Data Used to Assess Water Quality:

The site in the Russian River had a CSCI score(s) of 0.841923935.This meets the water quality objective and therefore, does support the aquatic life beneficial use.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

These samples were collected at the following station: 114PS0229

Temporal Representation:

These samples were collected on: 6/4/2013

Environmental Conditions:

QAPP Information:

Data collected following SWAMP QA protocols. QAPP for SWAMP Perennial Stream Surveys.

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33218

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Three of the fifty-seven (57) grab sample values were above the evaluation guideline. Temperatures ranged from 15.7 degrees C to 24.8 degrees C.

Data Reference:

Data for Bacteria and Nutrient in Sonoma County Water Agency, 2009-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323214

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-14 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Quality Assurance Project Plan for Region One for Bacteriological Sampling.

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects

Region 1 &>Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Grab samples were collected at three different locations on the Russian River: Cloverdale River Park, Geyserville @ Highway 128 Bridge, and Alexander Valley Campground.

Temporal Representation:

Grab samples collected between 5/28/09 and 10/1/2009.

Environmental Conditions:

QAPP Information:

Per the Sonoma County Water Agency (SCWA) the data are provisional and may contain inaccuracies as they have not gone through QA procedures.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

4765

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

Unspecified

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

31517

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

352595

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

Samples were collected from 2015-07-06 to 2015-07-06.

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Presentation: Interpreting Temperature Standards in the North Coast Region. North Coast Regional Water Quality Control Board.

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

353511

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Biological Opinion for the Proposed License Amendment to the Potter Valley Project (FERC Project #77-110)

Guideline Reference:

Historical Salmonid Streams and Calwater 2.2a Hydrologic Subareas. Figure shows Chinook, coho, and steelhead distribution in the Russian River watershed.

Guideline Reference:

A History of the Salmonid Decline in the Russian River.

Spatial Representation:

Information pertains to Russian River HU, including the Geyserville HSA.

Temporal Representation:

Data are reflective of current conditions in this water body.

Environmental Conditions:

QAPP Information:

Information is considered to be of adequate quality for the Integrated Report.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

96476

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

The site in the Russian River had a CSCI score(s) of 0.841923935.This meets the water quality objective and therefore, does support the aquatic life beneficial use.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

These samples were collected at the following station: 114PS0229

Temporal Representation:

These samples were collected on: 6/4/2013

Environmental Conditions:

QAPP Information:

Data collected following SWAMP QA protocols. QAPP for SWAMP Perennial Stream Surveys.

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33218

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Three of the fifty-seven (57) grab sample values were above the evaluation guideline. Temperatures ranged from 15.7 degrees C to 24.8 degrees C.

Data Reference:

Data for Bacteria and Nutrient in Sonoma County Water Agency, 2009-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.

The sites in Kellogg Creek had a CSCI score(s) of 0.572244893 on 3/27/15 and 0.628815848 & 0.551867092 on 3/26/15. Given that the samples were collected in the same stream on consecutive days and stream conditions between those days did not change, all samples were averaged to 0.58430927.

Data Reference:

SWAMP Data:

Water Quality Objective/Criterion:

From the Water Quality Control Plan, North Coast Region: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

These samples were collected at the following station:
114KLCT41
114KLCT42
114KLCT53

Temporal Representation:

These samples were collected on:
3/26/2015
3/27/2015

Environmental Conditions:

QAPP Information:

Data collected following SWAMP QA protocols. DFW_ABL_Monitoring

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43279

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327885

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Grab samples were collected at three different locations on the Russian River: Cloverdale River Park, Geyserville @ Highway 128 Bridge, and Alexander Valley Campground.

Temporal Representation:

Grab samples collected between 5/28/09 and 10/1/2009.

Environmental Conditions:

QAPP Information:

Per the Sonoma County Water Agency (SCWA) the data are provisional and may contain inaccuracies as they have not gone through QA procedures.

QAPP Information Reference(s):

Quality Assurance Project Plan for Region One for Bacteriological Sampling.

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

4765

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

Presentation: Interpreting Temperature Standards in the North Coast Region. North Coast Regional Water Quality Control Board.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

Unspecified

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

31517

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Biological Opinion for the Proposed License Amendment to the Potter Valley Project (FERC Project #77-110)

Guideline Reference:

Historical Salmonid Streams and Calwater 2.2a Hydrologic Subareas. Figure shows Chinook, coho, and steelhead distribution in the Russian River watershed.

Guideline Reference:

A History of the Salmonid Decline in the Russian River.

Spatial Representation:

Information pertains to Russian River HU, including the Geyserville HSA.

Temporal Representation:

Data are reflective of current conditions in this water body.

Environmental Conditions:

QAPP Information:

Information is considered to be of adequate quality for the Integrated Report.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

96476

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323187

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 3 of 6 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318948

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL align="left" valign="top" width="33%">Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

These samples were collected at the following station:
114KLCT41
114KLCT42
114KLCT53

Temporal Representation:

These samples were collected on:
3/26/2015
3/27/2015

Environmental Conditions:

QAPP Information:

Data collected following SWAMP QA protocols. DFW_ABL_Monitoring

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43279

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: RUSSIAN R A ASTI CA; station code: USGS-11463400.

Temporal Representation:

These samples were collected on 6/11/2017 and 6/10/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318474

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Camp Rose Beach; station code: 114RR3119.

Temporal Representation:

These samples were collected from 5/19/2011-7/20/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

327885

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318478

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Cloverdale Airport; station code: 114RR5407.

Temporal Representation:

These samples were from 3/5/2016-8/19/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

317914

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Big Sulphur Creek at River Road; station code: 114BS0310.

Temporal Representation:

These samples were collected from 12/15/2016-12/20/2017.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318720

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: BIG SULPHUR C NR CLOVERDALE CA; station code: USGS-11463200.

Temporal Representation:

This sample was collected on 6/10/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

323187

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 3 of 6 samples exceeded the water quality threshold for Aluminum.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318948

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL ONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318076

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Franz Creek at Chalk Hill Road; station code: 114FR0102.

Temporal Representation:

This sample was collected on 1/6/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318950

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: RUSSIAN R A ASTI CA; station code: USGS-11463400.

Temporal Representation:

These samples were collected on 6/11/2017 and 6/10/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318474

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Camp Rose Beach; station code: 114RR3119.

Temporal Representation:

These samples were collected from 5/19/2011-7/20/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318478

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Cloverdale Airport; station code: 114RR5407.

Temporal Representation:

These samples were from 3/5/2016-8/19/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

317914

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: RUSSIAN R A DIGGER BEND NR HEALDSBURG CA; station code: USGS-11463980.

Temporal Representation:

These samples were collected from 7/26/2011-11/6/2017.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318964

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: RUSSIAN R A PRESTON CA; station code: USGS-11463150.

Temporal Representation:

These samples were collected on 6/11/2017 and 7/8/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318485

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Del Rio Woods Park; station code: 114RR3173,

Temporal Representation:

These samples were collected from 8/24/2015-7/20/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318481

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): The 90% upper limit specific conductance objecjective, so that 1 of 2 samples exceed the water quality objective for specific conductivity.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Big Sulphur Creek at River Road; station code: 114BS0310.

Temporal Representation:

These samples were collected from 12/15/2016-12/20/2017.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318720

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: BIG SULPHUR C NR CLOVERDALE CA; station code: USGS-11463200.

Temporal Representation:

This sample was collected on 6/10/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318076

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Franz Creek at Chalk Hill Road; station code: 114FR0102.

Temporal Representation:

This sample was collected on 1/6/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318950

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Cloverdale River Park; station code: 114RR5748.

Temporal Representation:

These samples were collected from 5/21/2012-8/24/2015.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318454

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Russian River ~1.1mi above Crocker Cr.; station code: 114PS0289.

Temporal Representation:

This sample was collected on 7/6/2015.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Perennial Stream Surveys

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318471

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Alexander Valley Road; station code: 114RR4234.

Temporal Representation:

These samples were collected from 5/19/2011-6/24/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318260

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for SWAMP RWB1 Monitoring and determined that 1 of 1 sample exceeds the water quality objective for calendar year 2016.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/gn="left" valign="top" width="67%">Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: RUSSIAN R A DIGGER BEND NR HEALDSBURG CA; station code: USGS-11463980.

Temporal Representation:

These samples were collected from 7/26/2011-11/6/2017.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318964

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: RUSSIAN R A PRESTON CA; station code: USGS-11463150.

Temporal Representation:

These samples were collected on 6/11/2017 and 7/8/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318485

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Del Rio Woods Park; station code: 114RR3173,

Temporal Representation:

These samples were collected from 8/24/2015-7/20/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318481

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): The 90% upper limit specific conductance objecCriterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Lytton Creek at Russian River; station code: 114LY0010.

Temporal Representation:

This sample was collected on 3/5/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318960

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: RUSSIAN R A JIMTOWN CA; USGS-11463682.

Temporal Representation:

These samples were collected from 8/13/2015-10/28/2016.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318503

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Highway 128; station code: 114RR4751.

Temporal Representation:

These samples were collected from 5/26/2011-10/6/2011.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318483

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Cloverdale River Park; station code: 114RR5748.

Temporal Representation:

These samples were collected from 5/21/2012-8/24/2015.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318454

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Russian River ~1.1mi above Crocker Cr.; station code: 114PS0289.

Temporal Representation:

This sample was collected on 7/6/2015.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Perennial Stream Surveys

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318471

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Alexander Valley Road; station code: 114RR4234.

Temporal Representation:

These samples were collected from 5/19/2011-6/24/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318260

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for SWAMP RWB1 Monitoring and determined that 1 of 1 sample exceeds the water quality objective for calendar year 2016.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/td>

Spatial Representation:

These samples were collected at sampling station name: Russian River at Crocker Road; station code: 114RR5652.

Temporal Representation:

These samples were collected from 6/6/2012-7/20/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318884

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA; station code: USGS-383719122462501.

Temporal Representation:

These samples were collected on 5/1/2017 and 5/8/2017.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318980

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River; station code: NARS_WQX-CAR9-0903.

Temporal Representation:

These samples were collected on 8/26/2913 and 9/25/2013.

Environmental Conditions:

QAPP Information:

QAPP for EPA National Aquatic Resources Survey (NARS)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329255

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial RepresCriterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Lytton Creek at Russian River; station code: 114LY0010.

Temporal Representation:

This sample was collected on 3/5/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318960

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: RUSSIAN R A JIMTOWN CA; USGS-11463682.

Temporal Representation:

These samples were collected from 8/13/2015-10/28/2016.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318503

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River at Highway 128; station code: 114RR4751.

Temporal Representation:

These samples were collected from 5/26/2011-10/6/2011.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318483

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-05-01 and 2017-05-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329274

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: DCRBPI_ WQX-VY1 (Vineyard reach stage and temp).

Temporal Representation:

The samples were collected between the dates of 2016-06-02 and 2016-06-02

Environmental Conditions:

QAPP Information:

Dry Creek Rancheria Band of Pomo Indians QA

QAPP Information Reference(s):

Data collected by a California Tribe QAPP Approved by U.S. EPA QAPP Reference

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326934

Pollutant:

Temperature, water

Spatial Representation:

These samples were collected at sampling station name: Russian River at Crocker Road; station code: 114RR5652.

Temporal Representation:

These samples were collected from 6/6/2012-7/20/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318884

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA; station code: USGS-383719122462501.

Temporal Representation:

These samples were collected on 5/1/2017 and 5/8/2017.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

318980

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 2 samples exceeded the water quality threshold for Temperature.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3173 (Russian River at Del Rio Woods Park).

Temporal Representation:

The samples were collected between the dates of 2015-08-24 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329310

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Russian River; station code: NARS_WQX-CAR9-0903.

Temporal Representation:

These samples were collected on 8/26/2913 and 9/25/2013.

Environmental Conditions:

QAPP Information:

QAPP for EPA National Aquatic Resources Survey (NARS)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329255

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Represe natural receiving water temperature (Basin Plan, North Coast Region).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463980 (RUSSIAN R A DIGGER BEND NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2014-09-15 and 2017-11-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326943

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Temperature.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-06 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-05-01 and 2017-05-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329274

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: DCRBPI_ WQX-VY1 (Vineyard reach stage and temp).

Temporal Representation:

The samples were collected between the dates of 2016-06-02 and 2016-06-02

Environmental Conditions:

QAPP Information:

Dry Creek Rancheria Band of Pomo Indians QA

QAPP Information Reference(s):

Data collected by a California Tribe QAPP Approved by U.S. EPA QAPP Reference

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326934

Pollutant:

Temperature, water

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326976

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Temperature.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114LY0010 (Lytton Creek at Russian River).

Temporal Representation:

The samples were collected between the dates of 2016-03-05 and 2016-03-05

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329249

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed EPA National Aquatic Resourign="top" width="33%">LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 2 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3173 (Russian River at Del Rio Woods Park).

Temporal Representation:

The samples were collected between the dates of 2015-08-24 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329310

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) abovces Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 2 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River).

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326975

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463980 (RUSSIAN R A DIGGER BEND NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2014-09-15 and 2017-11-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326943

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Temperature.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-06 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329270

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463682 (RUSSIAN R A JIMTOWN CA).

Temporal Representation:

The samples were collected between the dates of 2015-08-13 and 2016-10-28

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326968

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326976

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Temperature.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114LY0010 (Lytton Creek at Russian River).

Temporal Representation:

The samples were collected between the dates of 2016-03-05 and 2016-03-05

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329249

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed EPA National Aquatic Resour align="left" valign="top" width="33%">Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326911

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 4 of 12 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature (Basin Plan, North Coastces Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 2 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River).

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326975

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5748 (Russian River at Cloverdale River Park).

Temporal Representation:

The samples were collected between the dates of 2012-05-23 and 2015-08-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326927

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 24 of 58 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2011-05-24 and 2019-06-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329270

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463682 (RUSSIAN R A JIMTOWN CA).

Temporal Representation:

The samples were collected between the dates of 2015-08-13 and 2016-10-28

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326968

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329278

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326945

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 15 of 25 samples exceeded the water quality threshold for Temperature.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2016-03-05 and 2019-07-30

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329300

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Temperature.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326911

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 4 of 12 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature (Basin Plan, North Coast="67%">The samples were collected at 1 monitoring site: USGS-11463000 (RUSSIAN R NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2015-07-08 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326929

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 7 of 19 samples exceeded the water quality threshold for Temperature.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4751 (Russian River at Highway 128-114RR4751).

Temporal Representation:

The samples were collected between the dates of 2011-05-26 and 2011-10-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326920

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2012-06-11 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326956

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 33 of 44 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5748 (Russian River at Cloverdale River Park).

Temporal Representation:

The samples were collected between the dates of 2012-05-23 and 2015-08-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326927

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 24 of 58 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2011-05-24 and 2019-06-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3119 (Russian River at Camp Rose Beach-114RR3119).

Temporal Representation:

The samples were collected between the dates of 2011-05-24 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329254

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329278

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326945

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use NG-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329288

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326274

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2016-03-05 and 2019-07-30

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329300

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328868

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463000 (RUSSIAN R NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2015-07-08 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328823

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326222

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 8 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Repor="67%">The samples were collected at 1 monitoring site: USGS-11463000 (RUSSIAN R NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2015-07-08 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326929

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 7 of 19 samples exceeded the water quality threshold for Temperature.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4751 (Russian River at Highway 128-114RR4751).

Temporal Representation:

The samples were collected between the dates of 2011-05-26 and 2011-10-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326920

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2012-06-11 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326956

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 33 of 44 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326104

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 76 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2019-06-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects

Objective/Criterion Reference:

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3119 (Russian River at Camp Rose Beach-114RR3119).

Temporal Representation:

The samples were collected between the dates of 2011-05-24 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329254

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

107330

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114PS0229)

Temporal Representation:

The samples were collected between the dates of 2013-06-04 and 2013-06-04

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328789

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

329288

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326274

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Perennial Stream Surveys data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as ft" valign="top" width="67%">Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463682 (RUSSIAN R A JIMTOWN CA).

Temporal Representation:

The samples were collected between the dates of 2015-08-13 and 2016-10-28

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328815

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-05-01 and 2017-05-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects

Region 1

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328868

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463000 (RUSSIAN R NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2015-07-08 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104959

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 21 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR3119_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2011-10-04

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328855

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concenle="background-color:#CCCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328823

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326222

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 8 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Reportration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

1745

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

Draft QAPP for Volunteer Water Quality Monitoring Project for the Community Clean Water Institute.

QAPP Information Reference(s):

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326104

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 76 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2019-06-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

31550

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

At the present time, natural background turbidity levels have not been determined for this watershed, and exceedence probabilities (the turbidity, associated with flow, that is exceeded X% of the time) have not been calculated. Thus, there is currently no appropriate evaluation guideline for this watershed, and no way to determine whether the objective is being exceeded. This LOE and LOE 46509 replace LOE 1745 which (1) utilized an evaluation guideline that was determined to be inappropriate by the Intagrated Report Roundtable comprised of State and Regional Water Board staff members, and (2) included the evaluation of data from the Russian River at Healdsburg which is in the Guerneville HSA (not the Geyserville HSA).

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Turbidity shall not be increased more than 20 percent above naturally occurring background levels. Allowable zones of dilution within which higher percentages can be tolerated may be defined for specific discharges upon the issuance of discharge permits or waiver thereof.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

There were two sampling locations along the Russian River at Cloverdale. They are as follows: -Sample site RUS080 is located at the Cloverdale 1st St. bridge, Cloverdale. -Sample site RUS090 is located at the Cloverdale River Park, Cloverdale.

Temporal Representation:

RUS080 and RUS090 were sampled once a month, January through May 2003, and in July and August 2003. Samples were taken on the same days of the month at each location.

Environmental Conditions:

QAPP Information:

Draft QAPP for Volunteer Water Quality Monitoring Project for the Community Clean Water Institute.

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324304

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to deterADDING-BOTTOM: 3px; WIDTH: 100%; text-align: right; PADDING-TOP: 3px; font-smooth: always">Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

107330

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114PS0229)

Temporal Representation:

The samples were collected between the dates of 2013-06-04 and 2013-06-04

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328789

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324356

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 6 samples exceeded the water quality threshold for Copper.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

&ft" valign="top" width="67%">Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463682 (RUSSIAN R A JIMTOWN CA).

Temporal Representation:

The samples were collected between the dates of 2015-08-13 and 2016-10-28

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328815

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-05-01 and 2017-05-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104959

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 21 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR3119_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2011-10-04

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328855

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

1745

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

Draft QAPP for Volunteer Water Quality Monitoring Project for the Community Clean Water Institute.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

31550

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

RUS080 and RUS090 were sampled once a month, January through May 2003, and in July and August 2003. Samples were taken on the same days of the month at each location.

Environmental Conditions:

QAPP Information:

Draft QAPP for Volunteer Water Quality Monitoring Project for the Community Clean Water Institute.

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324304

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 3 of 7 samples exceeded the water quality threshold for Copper.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324356

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 6 samples exceeded the water quality threshold for Copper.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328251

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108338

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Copper.

Data Reference:

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328251

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108338

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328282

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328269

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324286

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 6 samples exceeded the water quality threshold for Copper.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP 52.zip">Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328282

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328269

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324286

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 6 samples exceeded the water quality threshold for Copper.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328280

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324292

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 3 of 7 samples exceeded the water quality threshold for Copper.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108337

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Copper.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardnData:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328280

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324292

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 3 of 7 samples exceeded the water quality threshold for Copper.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108337

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Copper.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43639

Pollutant:

Copper

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for copper is 149 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33202

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for copper.

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples collected between 11/26/2007 and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104965

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43639

Pollutant:

Copper

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for copper is 149 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33202

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for copper.

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples collected between 11/26/2007 and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104965

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4751_SWAMP)

Temporal Representation:

The sample was collected on 2011-05-26.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328798

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed EPA National Aquatic Resources Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River).

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328796

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326117

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 59 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4751_SWAMP)

Temporal Representation:

The sample was collected on 2011-05-26.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328798

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed EPA National Aquatic Resources Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River).

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328796

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326117

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 59 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3119 (Russian River at Camp Rose Beach-114RR3119).

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104963

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4751_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-06-09 and 2011-10-06

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3119 (Russian River at Camp Rose Beach-114RR3119).

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104963

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4751_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-06-09 and 2011-10-06

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104950

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected on 2010-09-30, 2011-08-03, and 2011-10-12.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111596

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 4 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

104950

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected on 2010-09-30, 2011-08-03, and 2011-10-12.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111596

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 4 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-05-19 to 2011-05-31 and on 2014-02-03.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328876

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463682 (RUSSIAN R A JIMTOWN CA).

Temporal Representation:

The samples were collected between the dates of 2015-08-13 and 2016-10-28

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328869

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-05-19 to 2011-05-31 and on 2014-02-03.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328876

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463682 (RUSSIAN R A JIMTOWN CA).

Temporal Representation:

The samples were collected between the dates of 2015-08-13 and 2016-10-28

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328869

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326195

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Watd>

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326195

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2012-06-06 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326284

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4751 (Russian River at Highway 128-114RR4751).

Temporal Representation:

The samples were collected between the dates of 2011-05-26 and 2011-10-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104971

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2012-06-06 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326284

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4751 (Russian River at Highway 128-114RR4751).

Temporal Representation:

The samples were collected between the dates of 2011-05-26 and 2011-10-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104971

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5748)

Temporal Representation:

The sample was collected on 5/26/11.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104968

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Regionop" width="67%">Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5748)

Temporal Representation:

The sample was collected on 5/26/11.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104968

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected on 11/30/10, 4/12/11, 5/31/11, and 11/30/11.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101369

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

If DO concentrations fall below the numeric objectives set forth by the Basin Plan (2018). If NO, then the waterbody is supporting that beneficial use, if YES, then that waterbody is considered impaired.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Dissolved oxygen (DO) concentrations shall conform to the numeric objectives expressed in section 3.3.5.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EVIDENCE OF SALMONID PRESENCE & LIFE CYCLE USE: Coho, steelhead, and Chinook are all present in the Russian River watershed (CDFG 2002). Spawning, incubation, and emergence for these three salmonid species cumulatively occurs November through the end of May. Steelhead juveniles rear year-round in the Russian River (Steiner Environmental Consulting 1996).

Guideline Reference:

Historical Salmonid Streams and Calwater 2.2a Hydrologic Subareas. Figure shows Chinook, coho, and steelhead distribution in the Russian River watershed.

Guideline Reference:

A History of the Salmonid Decline in the Russian River.

Guideline Reference:

Biological Opinion for the Proposed License Amendment to the Potter Valley Project (FERC Project #77-110)

Spatial Representation:

Information pertains to Russian River HU, including the Geyserville HSA.

Temporal Representation:

Data are reflective of current conditions in this water body.

Environmental Conditions:

QAPP Information:

Information is considered to be of adequate quality for the Integrated Report process.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects

Region 1

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected on 11/30/10, 4/12/11, 5/31/11, and 11/30/11.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101369

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Dissolved oxygen (DO) concentrations shall conform to the numeric objectives expressed in section 3.3.5.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Historical Salmonid Streams and Calwater 2.2a Hydrologic Subareas. Figure shows Chinook, coho, and steelhead distribution in the Russian River watershed.

Guideline Reference:

A History of the Salmonid Decline in the Russian River.

Guideline Reference:

Biological Opinion for the Proposed License Amendment to the Potter Valley Project (FERC Project #77-110)

Spatial Representation:

Information pertains to Russian River HU, including the Geyserville HSA.

Temporal Representation:

Data are reflective of current conditions in this water body.

Environmental Conditions:

QAPP Information:

Information is considered to be of adequate quality for the Integrated Report process.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328804

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463000 (RUSSIAN R NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2015-07-08 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326256

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 76 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5.CCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328804

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463000 (RUSSIAN R NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2015-07-08 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326256

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 76 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2019-06-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328826

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463980 (RUSSIAN R A DIGGER BEND NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2014-09-15 and 2017-11-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2019-06-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328826

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463980 (RUSSIAN R A DIGGER BEND NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2014-09-15 and 2017-11-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326296

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2016-07-27 and 2019-08-19

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104970

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

326296

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2016-07-27 and 2019-08-19

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104970

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5748)

Temporal Representation:

The samples were collected between the dates of 2011-06-09 and 2011-10-06.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104951

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected on 11/30/10, 4/12/11-5/31/11, and 11/30/11.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111595

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5748)

Temporal Representation:

The samples were collected between the dates of 2011-06-09 and 2011-10-06.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104951

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected on 11/30/10, 4/12/11-5/31/11, and 11/30/11.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111595

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-06-14 and 2011-10-04.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104967

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-06-14 and 2011-10-04.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104967

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected on 9/28/10, 8/3/11, and 10/12/11.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104958

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 3 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR3119_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2011-05-31.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326233

~~Water Quality Control Plan (Basin Plan) for the North Coast Region~~

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected on 9/28/10, 8/3/11, and 10/12/11.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104958

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 3 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR3119_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2011-05-31.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326233

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 8 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328875

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Co/td>

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 8 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328875

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-05-01 and 2017-05-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326172

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-06 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

112474

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-05-01 and 2017-05-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326172

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-06 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

112474

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114PS0229)

Temporal Representation:

The samples were collected between the dates of 2013-06-04 and 2013-06-04

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326096

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114PS0229)

Temporal Representation:

The samples were collected between the dates of 2013-06-04 and 2013-06-04

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326096

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3173 (Russian River at Del Rio Woods Park).

Temporal Representation:

The samples were collected between the dates of 2015-08-24 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104969

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111587

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3173 (Russian River at Del Rio Woods Park).

Temporal Representation:

The samples were collected between the dates of 2015-08-24 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104969

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111587

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

6216

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Migration | Fish Spawning | Preservation of Rare & Endangered Species | Warm Freshwater Habitat | Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Per the National Recommended Water Quality Criteria (USEPA 2006): The 1-hour average maximum concentration criterion for freshwater aquatic life protection is 0.0d align="left" valign="top" width="33%">Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

6216

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Migration | Fish Spawning | Preservation of Rare & Endangered Species | Warm Freshwater Habitat | Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Per the National Recommended Water Quality Criteria (USEPA 2006): The 1-hour average maximum concentration criterion for freshwater aquatic life protection is 0.08 ug/l.

Guideline Reference:

Spatial Representation:

The samples were collected from 2 sites in Foss Creek as follows: (1) in Foss Creek in downtown Healdsburg, and (2) in Upper Foss Creek.

Temporal Representation:

The samples were collected on November 7, 2002. At each site, 3 instantaneous grab samples were collected over half hour increments. The data are averaged for each site.

Environmental Conditions:

Samples were collected during the first runoff event of the rainy season.

QAPP Information:

Samples were collected in accordance with the study plan and quality control procedures described by Katznelson et al. (2003).

QAPP Information Reference(s):

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104966

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4751_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-05-26 and 2011-10-06

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328860

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328829

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Guideline Reference:

Spatial Representation:

The samples were collected from 2 sites in Foss Creek as follows: (1) in Foss Creek in downtown Healdsburg, and (2) in Upper Foss Creek.

Temporal Representation:

The samples were collected on November 7, 2002. At each site, 3 instantaneous grab samples were collected over half hour increments. The data are averaged for each site.

Environmental Conditions:

Samples were collected during the first runoff event of the rainy season.

QAPP Information:

Samples were collected in accordance with the study plan and quality control procedures described by Katznelson et al. (2003).

QAPP Information Reference(s):

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104966

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4751_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-05-26 and 2011-10-06

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSAWater Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463980 (RUSSIAN R A DIGGER BEND NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2014-09-15 and 2017-11-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326259

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-06 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326087

Pollutant:

Oxygen, Dissolved

LOE ID:

328860

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328829

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4751 (Russian River at Highway 128-114RR4751).

Temporal Representation:

The samples were collected between the dates of 2011-05-26 and 2011-10-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326293

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463980 (RUSSIAN R A DIGGER BEND NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2014-09-15 and 2017-11-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326259

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-06 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326087

Pollutant:

Oxygen, Dissolved

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2016-07-27 and 2019-08-19

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326085

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 59 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3119 (Russian River at Camp Rose Beach-114RR3119).

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326116

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5748 (Russian River at Cloverdale River Park).

Temporal Representation:

The samples were collected between the dates of 2012-05-21 and 2015-08-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328834

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed EPA National Aquatic Resources Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River).

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

OE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4751 (Russian River at Highway 128-114RR4751).

Temporal Representation:

The samples were collected between the dates of 2011-05-26 and 2011-10-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326293

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2016-07-27 and 2019-08-19

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326085

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 59 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3119 (Russian River at Camp Rose Beach-114RR3119).

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326116

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None


DECISION ID	157549	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Copper
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Thirty-one lines of evidence are available in the administrative record to assess this pollutant. **DISSOLVED FRACTION OF WATER FOR COLD FRESHWATER HABITAT BENEFICIAL USE OBJECTIVE: BIG SULPHUR CREEK: There are three lines of evidence (LOEs 108337, 324292, 328269) and 3 of 14 samples exceed the objective, and this exceeds the allowable frequency in Table 3.1 of the Listing Policy. RUSSIAN RIVER: There are four lines of evidence (LOEs 108339, 324286, 328273, 328280) and 2 of 15 samples exceed the objective, and this exceeds the allowable frequency in Table 3.1 of the Listing Policy. *DISSOLVED FRACTION OF WATER FOR THE MUNICIPAL & DOMESTIC SUPPLY BENEFICIAL USE OBJECTIVE: BIG SUPHUR CREEK: Two lines of evidence are available (LOEs 324359, 328260) and 0 of two samples exceed the objective, and this is insufficient data to apply Table 3.1 of the Listing Policy. RUSSIAN RIVER: Three lines of evidence are available (LOEs 324294, 328257, 328285) and 0 of four samples exceed the objective and this is insufficient data to apply Table 3.1 of the Listing Policy. *DISSOLVED FRACTION OF WATER FOR THE WARM FRESHWATER HABITAT BENEFICIAL USE OBJECTIVE: BIG SULPHUR CREEK: Three lines of evidence are available (LOEs 108338, 324304, 328251) and 3 of 14 samples exceed the objective, and this exceeds the allowable frequency in Table 3.1 of the Listing Policy. *RUSSIAN RIVER: Four lines of evidence are available (LOEs 108340, 324356, 328281, 328282) and 2 of 15 samples exceed the objective, and this exceeds the allowable frequency in Table 3.1 of the Listing Policy. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Three of 14 samples for Big Sulphur Creek and 2 of 15 samples for Russian River exceed the objective and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. This listing applies to the mainstem Russian River and Big Sulphur Creek.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:	This listing applies to the mainstem Russian River and Big Sulphur Creek.

;

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108340

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5748 (Russian River at Cloverdale River Park).

Temporal Representation:

The samples were collected between the dates of 2012-05-21 and 2015-08-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169332, Benthic Community Effects	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328834

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed EPA National Aquatic Resources Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River).

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Copper.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108338

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43639

Pollutant:

Copper

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for copper is 149 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43640

Pollutant:

Copper

LOE Subgroup:

Pollutant-Sediment


DECISION ID	157549	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Copper
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Thirty-one lines of evidence are available in the administrative record to assess this pollutant. **DISSOLVED FRACTION OF WATER FOR COLD FRESHWATER HABITAT BENEFICIAL USE OBJECTIVE: BIG SULPHUR CREEK: There are three lines of evidence (LOEs 108337, 324292, 328269) and 3 of 14 samples exceed the objective, and this exceeds the allowable frequency in Table 3.1 of the Listing Policy. RUSSIAN RIVER: There are four lines of evidence (LOEs 108339, 324286, 328273, 328280) and 2 of 15 samples exceed the objective, and this exceeds the allowable frequency in Table 3.1 of the Listing Policy. *DISSOLVED FRACTION OF WATER FOR THE MUNICIPAL & DOMESTIC SUPPLY BENEFICIAL USE OBJECTIVE: BIG SUPHUR CREEK: Two lines of evidence are available (LOEs 324359, 328260) and 0 of two samples exceed the objective, and this is insufficient data to apply Table 3.1 of the Listing Policy. RUSSIAN RIVER: Three lines of evidence are available (LOEs 324294, 328257, 328285) and 0 of four samples exceed the objective and this is insufficient data to apply Table 3.1 of the Listing Policy. *DISSOLVED FRACTION OF WATER FOR THE WARM FRESHWATER HABITAT BENEFICIAL USE OBJECTIVE: BIG SULPHUR CREEK: Three lines of evidence are available (LOEs 108338, 324304, 328251) and 3 of 14 samples exceed the objective, and this exceeds the allowable frequency in Table 3.1 of the Listing Policy. *RUSSIAN RIVER: Four lines of evidence are available (LOEs 108340, 324356, 328281, 328282) and 2 of 15 samples exceed the objective, and this exceeds the allowable frequency in Table 3.1 of the Listing Policy. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Three of 14 samples for Big Sulphur Creek and 2 of 15 samples for Russian River exceed the objective and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. This listing applies to the mainstem Russian River and Big Sulphur Creek.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:	This listing applies to the mainstem Russian River and Big Sulphur Creek.

="33%">Matrix: <"left" valign="top" width="33%">Beneficial Use:

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108340

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for copper is 149 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33202

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Code

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Copper.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108338

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples collected between 11/26/2007 and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108343

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124122

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43639

Pollutant:

Copper

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for copper is 149 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43640

Pollutant:

Copper

LOE Subgroup:

Pollutant-Sediment

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Copper, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108341

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Co

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for copper is 149 mg/Kg dry weight (MacDonald et al. 2000).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Alexander RV Park - 114RRAXRV ]

Temporal Representation:

Data was collected on a single day 10/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

33202

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for copper.

Data Reference:

Codeast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124133

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 23 samples exceed the criterion for Copper, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/21/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacrament of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

Samples collected between 11/26/2007 and 7/14/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108343

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124122

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124132

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceed the criterion for Copper, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Comminski Station - 114RRCOMM]

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124134

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 23 samples exceed the criterion for Copper, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 6/22/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41218

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324286

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 6 samples exceeded the water quality threshold for Copper.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324292

Pollutan="33%">Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Copper, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Cloverdale d/s STP - 114CLOSTP]

Temporal Representation:

Data was collected over the time period 10/5/2004-6/30/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108341

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Cot:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 3 of 7 samples exceeded the water quality threshold for Copper.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324359

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124133

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 23 samples exceed the criterion for Copper, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 6/21/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramentn="left" valign="top" width="33%">Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324294

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324304

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124132

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceed the criterion for Copper, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Comminski Station - 114RRCOMM]

Temporal Representation:

Data was collected over the time period 6/21/2001-6/25/2001.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

124134

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 3 of 7 samples exceeded the water quality threshold for Copper.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324303

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Copper.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Tetr>

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 23 samples exceed the criterion for Copper, Total. This LOE re-assesses data from LOE 21544 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Healdsburg Memorial Beach - 114RR2940]

Temporal Representation:

Data was collected over the time period 6/22/2001-11/13/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

41218

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324308

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Copper.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324356

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Inf="https://www.waterboards.ca.gov/water_issues/programs/tmdl/records/state_board/2012/ref3821.pdf" >Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324286

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 6 samples exceeded the water quality threshold for Copper.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324292

Pollutanormation Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 6 samples exceeded the water quality threshold for Copper.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328281

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 3 of 7 samples exceeded the water quality threshold for Copper.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324359

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324294

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324304

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328251

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328280

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328273

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 3 of 7 samples exceeded the water quality threshold for Copper.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324303

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Copper.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324308

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Copper.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

324356

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and InfG-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 157549, Copper

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328269

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328285

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328282

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157549, Copper

Region 1

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 6 samples exceeded the water quality threshold for Copper.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328281

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328257

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328260

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108339

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

108337

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

top" width="33%">QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328251 Pollutant: Copper LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Warm Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The dissolved copper criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 9 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328280 Pollutant: Copper LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The dissolved copper criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 9 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2017-06-11 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328273 Pollutant: Copper LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Copper. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The dissolved copper criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 9 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle



DECISION ID	157568	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Manganese
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Eleven lines of evidence are available in the administrative record to assess this pollutant. BIG SULPHUR CREEK has two lines of evidence for the total fraction of water samples (LOEs 116391, 325229) and 4 of 11 samples exceed the objective, which exceeds the allowable frequency in Table 3.1 of the Listing Policy. RUSSIAN RIVER has three lines of evidence for the total fraction of water samples (LOEs 42629, 116392, 325250) and 5 of 15 samples exceed the objective, which exceeds the allowable frequency in Table 3.1 of the Listing Policy. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Four of 11 samples exceed the objective for Big Sulphur Creek and 5 of 15 samples exceed the objective for the mainstem Russian River, and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. This listing applies to Big Sulphur Creek and the mainstem Russian River.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:	This listing applies to Big Sulphur Creek and the mainstem Russian River.

Line of Evidence (LOE) for Decision ID 157568, Manganese	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120778

Pollutant:

Manganese

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Line of Evidence (LOE) for Decision ID 157549, Copper

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328269 Pollutant: Copper LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The dissolved copper criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 9 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328285 Pollutant: Copper LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Manganese is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (USGS-11463980) Temporal Representation: The samples were collected between the dates of 2011-07-28 and 2011-07-28 Environmental Conditions: QAPP Information: QAPP not required for federal data QAPP Information Reference(s): This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 157568, Manganese	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 42629 Pollutant: Manganese LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Manganese. Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Manganese is 0.05 mg/L. Objective/Criterion Reference: Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449. Evaluation Guideline: Guideline Reference: Spatial Representation: Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652] Temporal Representation: Data was collected over the time period 11/26/2007-7/14/2008. Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data. QAPP Information: The SWAMP QAPP (2008) was followed. QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan -RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2017-06-11

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328282

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Line of Evidence (LOE) for Decision ID 157568, Manganese		Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116392

Pollutant:

Manganese

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Manganese.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157568, Manganese	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

116391

Pollutant:

Manganese

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Manganese.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

LOE ID: 328257 Pollutant: Copper LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Copper. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328260 Pollutant: Copper LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108339 Pollutant: Copper LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 6 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Copper. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-09-28 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157549, Copper	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 108337 Pollutant: Copper LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Cold Freshwater Habitat Number of Samples: 6 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Copper. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-09-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Manganese is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-09-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157568, Manganese	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325250 Pollutant: Manganese LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 5 Number of Exceedances: 3 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 3 of 5 samples exceeded the water quality threshold for Manganese. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Manganese is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2016-12-15 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157568, Manganese

DECISION ID	157568	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Manganese
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Eleven lines of evidence are available in the administrative record to assess this pollutant. BIG SULPHUR CREEK has two lines of evidence for the total fraction of water samples (LOEs 116391, 325229) and 4 of 11 samples exceed the objective, which exceeds the allowable frequency in Table 3.1 of the Listing Policy. RUSSIAN RIVER has three lines of evidence for the total fraction of water samples (LOEs 42629, 116392, 325250) and 5 of 15 samples exceed the objective, which exceeds the allowable frequency in Table 3.1 of the Listing Policy. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Four of 11 samples exceed the objective for Big Sulphur Creek and 5 of 15 samples exceed the objective for the mainstem Russian River, and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. This listing applies to Big Sulphur Creek and the mainstem Russian River.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:	This listing applies to Big Sulphur Creek and the mainstem Russian River.

Line of Evidence (LOE) for Decision ID 157568, Manganese	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

120778

Pollutant:

Manganese

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328465 Pollutant: Manganese LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Manganese. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Manganese is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157568, Manganese	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325229 Pollutant: Manganese LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 5 Number of Exceedances: 4 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 4 of 5 samples exceeded the water quality threshold for Manganese. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (Mth="33%">Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for the USGS National Water Information System SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Manganese is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (USGS-11463980) Temporal Representation: The samples were collected between the dates of 2011-07-28 and 2011-07-28 Environmental Conditions: QAPP Information: QAPP not required for federal data QAPP Information Reference(s): This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 157568, Manganese	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157568, Manganese	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325251

Pollutant:

Manganese

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Manganese.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157568, Manganese	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328467

Pollutant:

Manganese

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157568, Manganese	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328474

Pollutant:

Manganese

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157568, Manganese	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

325241

Pollutant:

Manganese

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Manganese.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2017-12-20 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

CCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 157568, Manganese

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116392 Pollutant: Manganese LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 6 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Manganese. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Manganese is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected between the dates of 2010-09-28 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157568, Manganese	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 116391 Pollutant: Manganese LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 6 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Manganese. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Manganese is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected between the dates of 2010-09-30 and 2011-11-30 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157568, Manganese	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157568, Manganese

DECISION ID	157575	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Oxygen, Dissolved
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Seventy-six lines of evidence are available in the administrative record to assess this pollutant. ***COLD FRESHWATER HABITAT BENEFICIAL USE* DO NOT LIST There are 33 lines of evidence for the COLD beneficial use and 3 of the 352 samples exceed the objective, which does not exceed the allowable frequency in Table 3.2 of the Listing Policy. *FISH SPAWNING BENEFICIAL USE* DO NOT LIST** For BIG SULPHUR CREEK, there are two lines of evidence (LOEs 326180, 328835) and 0 of the 9 samples exceed the objective, which is insufficient data to apply Table 3.2 of the Listing Policy. For FRANZ CREEK, there is one line of evidence (LOE 326289) and 0 of the two samples exceed the objective, which is insufficient data to apply Table 3.2 of the Listing Policy. For MAACAMA CREEK, there is one line of evidence (LOE 328787) and 0 of the 2 samples exceed the objective, which is insufficient data to apply Table 3.2 of the Listing Policy. LIST* For RUSSIAN RIVER, there are 14 lines of evidence (LOEs 326082, 326090, 326155, 326184, 326248, 326275, 326287, 326298, 328781, 328797, 328831, 328852, 328856, 328879) and 139 of the 238 samples exceed the objective, which exceeds the allowable frequency in Table 3.2 of the Listing Policy. **WARM FRESHWATER HABITAT BENEFICIAL USE* DO NOT LIST** There are 25 lines of evidence for the WARM beneficial use and 0 of the 344 samples exceed the objective, which does not exceed the allowable frequency in Table 3.2 of the Listing Policy. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. For the Fish Spawning beneficial use in the Russian River, 139 of 238 samples exceed the objective and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. This listing applies to the mainstem Russian River.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:	This listing applies to the mainstem Russian River.

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104968

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157568, Manganese	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325229 Pollutant: Manganese LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Municipal & Domestic Supply Number of Samples: 5 Number of Exceedances: 4 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 4 of 5 samples exceeded the water quality threshold for Manganese. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (Mgn="top" width="67%">Cold Freshwater Habitat Aquatic Life Use: Fish Spawning Number of Samples: 4 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Oxygen, Dissolved. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected on 11/30/10, 4/12/11, 5/31/11, and 11/30/11. Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 101369 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 0 Number of Exceedances: 0 Data and Information Type: Not Specified Data Used to Assess Water Quality: If DO concentrations fall below the numeric objectives set forth by the Basin Plan (2018). If NO, then the waterbody is supporting that beneficial use, if YES, then that waterbody is considered impaired. Data Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Dissolved oxygen (DO) concentrations shall conform to the numeric objectives expressed in section 3.3.5. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: EVIDENCE OF SALMONID PRESENCE & LIFE CYCLE USE: Coho, steelhead, and Chinook are all present in the Russian River watershed (CDFG 2002). Spawning, incubation, and emergence for these three salmonid species cumulatively occurs November through the end of May. Steelhead juveniles rear year-round in the Russian River (Steiner Environmental Consulting 1996). Guideline Reference: Historical Salmonid Streams and Calwater 2.2a Hydrologic Subareas. Figure shows Chinook, coho, and steelhead distribution in the Russian River watershed. Guideline Reference: A History of the Salmonid Decline in the Russian River. Guideline Reference: Biological Opinion for the Proposed License Amendment to the Potter Valley Project (FERC Project #77-110) Spatial Representation: Information pertains to Russian River HU, including the Geyserville HSA. Temporal Representation: Data are reflective of current conditions in this water body. Environmental Conditions: QAPP Information: Information is considered to be of adequate quality for the Integrated Report process. QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104951 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning Number of Samples: 5 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Oxygen, Dissolved. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected on 11/30/10, 4/12/11-5/31/11, and 11/30/11. Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2016-12-15 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157568, Manganese	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325251 Pollutant: Manganese LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Manganese. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Manganese is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157568, Manganese	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328467 Pollutant: Manganese LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Manganese. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Manganese is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157568, Manganese	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328474 Pollutant: Manganese LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Manganese. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Manganese is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157568, Manganese	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 325241 Pollutant: Manganese LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved Beneficial Use: Municipal & Domestic Supply Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Manganese. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Manganese is 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road). Temporal Representation: The samples were collected between the dates of 2017-12-20 and 2017-12-20 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP colspan="2"> LOE ID: 104950 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Oxygen, Dissolved. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for COLD beneficial use waters to be a daily minimum of 6.0 mg/L and a 7-day moving average of 8.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114BS0310) Temporal Representation: The samples were collected on 2010-09-30, 2011-08-03, and 2011-10-12. Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104959 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 21 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 21 samples exceeded the water quality standard for Oxygen, Dissolved. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR3119_SWAMP) Temporal Representation: The samples were collected between the dates of 2011-05-19 and 2011-10-04 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 111607 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Warm Freshwater Habitat Number of Samples: 19 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 19 samples exceeded the water quality standard for Oxygen, Dissolved. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5748) Temporal Representation: The samples were collected between the dates of 2011-05-26 and 2011-10-06 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 111597 <


DECISION ID	157575	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Oxygen, Dissolved
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Seventy-six lines of evidence are available in the administrative record to assess this pollutant. ***COLD FRESHWATER HABITAT BENEFICIAL USE* DO NOT LIST There are 33 lines of evidence for the COLD beneficial use and 3 of the 352 samples exceed the objective, which does not exceed the allowable frequency in Table 3.2 of the Listing Policy. *FISH SPAWNING BENEFICIAL USE* DO NOT LIST** For BIG SULPHUR CREEK, there are two lines of evidence (LOEs 326180, 328835) and 0 of the 9 samples exceed the objective, which is insufficient data to apply Table 3.2 of the Listing Policy. For FRANZ CREEK, there is one line of evidence (LOE 326289) and 0 of the two samples exceed the objective, which is insufficient data to apply Table 3.2 of the Listing Policy. For MAACAMA CREEK, there is one line of evidence (LOE 328787) and 0 of the 2 samples exceed the objective, which is insufficient data to apply Table 3.2 of the Listing Policy. LIST* For RUSSIAN RIVER, there are 14 lines of evidence (LOEs 326082, 326090, 326155, 326184, 326248, 326275, 326287, 326298, 328781, 328797, 328831, 328852, 328856, 328879) and 139 of the 238 samples exceed the objective, which exceeds the allowable frequency in Table 3.2 of the Listing Policy. **WARM FRESHWATER HABITAT BENEFICIAL USE* DO NOT LIST** There are 25 lines of evidence for the WARM beneficial use and 0 of the 344 samples exceed the objective, which does not exceed the allowable frequency in Table 3.2 of the Listing Policy. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. For the Fish Spawning beneficial use in the Russian River, 139 of 238 samples exceed the objective and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. This listing applies to the mainstem Russian River.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:	This listing applies to the mainstem Russian River.

Oxygen, Dissolved Fraction: assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved. valign="top" width="67%">1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104968

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

107330

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected on 11/30/10, 4/12/11, 5/31/11, and 11/30/11.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

101369

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Dissolved oxygen (DO) concentrations shall conform to the numeric objectives expressed in section 3.3.5.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114PS0229)

Temporal Representation:

The samples were collected between the dates of 2013-06-04 and 2013-06-04

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104966

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4751_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-05-26 and 2011-10-06

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104969

Pollutant:

Historical Salmonid Streams and Calwater 2.2a Hydrologic Subareas. Figure shows Chinook, coho, and steelhead distribution in the Russian River watershed.

Guideline Reference:

A History of the Salmonid Decline in the Russian River.

Guideline Reference:

Biological Opinion for the Proposed License Amendment to the Potter Valley Project (FERC Project #77-110)

Spatial Representation:

Information pertains to Russian River HU, including the Geyserville HSA.

Temporal Representation:

Data are reflective of current conditions in this water body.

Environmental Conditions:

QAPP Information:

Information is considered to be of adequate quality for the Integrated Report process.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104951

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected on 11/30/10, 4/12/11-5/31/11, and 11/30/11.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

34132

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples collected exceeded the objective.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

LOE ID:

104950

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected on 2010-09-30, 2011-08-03, and 2011-10-12.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104959

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 21 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Russian River at Crocker Road station (114RR5652).

Temporal Representation:

Samples were collected approximately once per quarter year from November 2007 to July 2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326248

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 12 of 17 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4751 (Russian River at Highway 128-114RR4751).

Temporal Representation:

The samples were collected between the dates of 2011-05-26 and 2011-10-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326085

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fracti"left" valign="top" width="33%">Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR3119_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2011-10-04

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111607

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 19 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5748)

Temporal Representation:

The samples were collected between the dates of 2011-05-26 and 2011-10-06

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111597

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2014-02-03

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

107330

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114PS0229)

Temporal Representation:

The samples were collected between the dates of 2013-06-04 and 2013-06-04

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104966

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4751_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-05-26 and 2011-10-06

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104969

Pollutant:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 59 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3119 (Russian River at Camp Rose Beach-114RR3119).

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104971

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5748)

Temporal Representation:

The sample was collected on 5/26/11.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104958

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 3 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR3119_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2011-05-31.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111587

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected between the dates of 2010-09-28 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

34132

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples collected exceeded the objective.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328868

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representat>

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Russian River at Crocker Road station (114RR5652).

Temporal Representation:

Samples were collected approximately once per quarter year from November 2007 to July 2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326248

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 12 of 17 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4751 (Russian River at Highway 128-114RR4751).

Temporal Representation:

The samples were collected between the dates of 2011-05-26 and 2011-10-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326085

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fractiion:

The samples were collected at 1 monitoring site: USGS-11463000 (RUSSIAN R NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2015-07-08 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328860

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328855

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Sampleon:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 59 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3119 (Russian River at Camp Rose Beach-114RR3119).

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104971

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5748)

Temporal Representation:

The sample was collected on 5/26/11.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104958

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 3 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR3119_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2011-05-31.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111587

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114BS0310)

Temporal Representation:

The samples were collected between the dates of 2010-09-30 and 2011-11-30

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328868

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463000 (RUSSIAN R NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2015-07-08 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328860

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328855

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328834

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed EPA National Aquatic Resources Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River).

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328829

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463980 (RUSSIAN R A DIGGER BEND NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2014-09-15 and 2017-11-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328823

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff s:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328834

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed EPA National Aquatic Resources Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River).

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328829

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463980 (RUSSIAN R A DIGGER BEND NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2014-09-15 and 2017-11-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328823

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328815

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-05-01 and 2017-05-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328815

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-05-01 and 2017-05-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328789

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463682 (RUSSIAN R A JIMTOWN CA).

Temporal Representation:

The samples were collected between the dates of 2015-08-13 and 2016-10-28

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328869

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326087

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4751 (Russian River at Highway 128-114RR4751).

Temporal Representation:

The samples were collected between the dates of 2011-05-26 and 2011-10-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326096

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3173 (Russian River at Del Rio Woods Park).

Temporal Representation:

The samples were collected between the dates of 2015-08-24 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326104

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 76 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objec

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328789

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463682 (RUSSIAN R A JIMTOWN CA).

Temporal Representation:

The samples were collected between the dates of 2015-08-13 and 2016-10-28

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328869

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326087

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4751 (Russian River at Highway 128-114RR4751).

Temporal Representation:

The samples were collected between the dates of 2011-05-26 and 2011-10-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2019-06-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326116

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5748 (Russian River at Cloverdale River Park).

Temporal Representation:

The samples were collected between the dates of 2012-05-21 and 2015-08-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326096

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3173 (Russian River at Del Rio Woods Park).

Temporal Representation:

The samples were collected between the dates of 2015-08-24 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326104

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 76 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objec 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326259

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-06 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326270

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2019-06-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326116

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5748 (Russian River at Cloverdale River Park).

Temporal Representation:

The samples were collected between the dates of 2012-05-21 and 2015-08-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved

Region 1

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2012-06-06 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326274

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326293

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2016-07-27 and 2019-08-19

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326222

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 8 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326172

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-06 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326089

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3173 (Russian River at Del Rio Woods Park).

Temporal Representation:

The samples were collected between the dates of 2015-08-24 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326117

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 59 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326259

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-06 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326270

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for ign="top" width="67%">The samples were collected at 1 monitoring site: 114RR3119 (Russian River at Camp Rose Beach-114RR3119).

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326153

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5748 (Russian River at Cloverdale River Park).

Temporal Representation:

The samples were collected between the dates of 2012-05-21 and 2015-08-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326280

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2012-06-06 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326274

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326293

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326284

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4751 (Russian River at Highway 128-114RR4751).

Temporal Representation:

The samples were collected between the dates of 2011-05-26 and 2011-10-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326296

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2016-07-27 and 2019-08-19

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326195

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2012-06-06 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326233

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 8 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326256

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 76 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2019-06-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326082

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3173 (Russian River at Del Rio Woods Park).

Temporal Representation:

The samples were collected between the dates of 2015-08-24 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326090

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 43 of 59 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3119 (Russian River at Camp Rose Beach-114RR3119).

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2016-07-27 and 2019-08-19

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326222

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 8 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for WARM beneficial use waters to be a daily minimum of 5.0 mg/L and a 7-day moving average of 6.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326172

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-06 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326089

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326155

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 11 of 16 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5748 (Russian River at Cloverdale River Park).

Temporal Representation:

The samples were collected between the dates of 2012-05-21 and 2015-08-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326275

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 17 of 22 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2012-06-06 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326180

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 8 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved

Regidth="33%">Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3173 (Russian River at Del Rio Woods Park).

Temporal Representation:

The samples were collected between the dates of 2015-08-24 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326117

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 59 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326287

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326289

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuarign="top" width="67%">The samples were collected at 1 monitoring site: 114RR3119 (Russian River at Camp Rose Beach-114RR3119).

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326153

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5748 (Russian River at Cloverdale River Park).

Temporal Representation:

The samples were collected between the dates of 2012-05-21 and 2015-08-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326280

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-06 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326184

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 49 of 76 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2019-06-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326284

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4751 (Russian River at Highway 128-114RR4751).

Temporal Representation:

The samples were collected between the dates of 2011-05-26 and 2011-10-06

LOE ID:

326298

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 4 of 26 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2016-07-27 and 2019-08-19

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328879

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326296

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport).

Temporal Representation:

The samples were collected between the dates of 2016-07-27 and 2019-08-19

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326195

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328856

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463682 (RUSSIAN R A JIMTOWN CA).

Temporal Representation:

The samples were collected between the dates of 2015-08-13 and 2016-10-28

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328852

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463980 (RUSSIAN R A DIGGER BEND NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2014-09-15 and 2017-11-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328835

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2012-06-06 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326233

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 8 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328831

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463000 (RUSSIAN R NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2015-07-08 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328797

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328787

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-05-01 and 2017-05-08

Environmental Conditions:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326256

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 76 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2019-06-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326082

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328876

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463682 (RUSSIAN R A JIMTOWN CA).

Temporal Representation:

The samples were collected between the dates of 2015-08-13 and 2016-10-28

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328875

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3173 (Russian River at Del Rio Woods Park).

Temporal Representation:

The samples were collected between the dates of 2015-08-24 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326090

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 43 of 59 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR3119 (Russian River at Camp Rose Beach-114RR3119).

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2017-05-01 and 2017-05-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328870

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-10 and 2018-06-10

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328781

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River).

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328826

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463980 (RUSSIAN R A DIGGER BEND NR HEALDSBURG CA).

Temporal Representation:

The samples were collected between the dates of 2014-09-15 and 2017-11-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328804

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463000 (RUSSIAN R NR CLOVERDALE CA).

Temporal Representation:

The samples were collected between the dates of 2015-07-08 and 2017-07-06

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328798

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed EPA National Aquatic Resources Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River).

Temporal Representation:

The samples were collected between the dates of 2013-08-26 and 2013-09-25

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

328796

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and EstuarieEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved

Region 1

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326155

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 11 of 16 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5748 (Russian River at Cloverdale River Park).

Temporal Representation:

The samples were collected between the dates of 2012-05-21 and 2015-08-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326275

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 17 of 22 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA).

Temporal Representation:

The samples were collected between the dates of 2017-06-11 and 2018-06-08

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

112474

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114PS0229)

Temporal Representation:

The samples were collected between the dates of 2013-06-04 and 2013-06-04

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved

Region 1

Russian River HU, Middle Rud>

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR5652 (Russian River at Crocker Road).

Temporal Representation:

The samples were collected between the dates of 2012-06-06 and 2016-07-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326180

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 8 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114BS0310 (Big Sulphur Creek at River Road).

Temporal Representation:

The samples were collected between the dates of 2016-12-15 and 2017-12-20

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved

Regissian River HA, Geyserville HSA

LOE ID:

104957

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR3119_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-06-14 and 2011-10-04

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111596

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 4 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326287

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114PS0289 (Russian River ~1.1mi above Crocker Cr.).

Temporal Representation:

The samples were collected between the dates of 2015-07-06 and 2015-07-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326289

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuarse limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-05-19 to 2011-05-31 and on 2014-02-03.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104965

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4751_SWAMP)

Temporal Representation:

The sample was collected on 2011-05-26.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

EIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Russian River HU, Middle Russian River HA, Geyserville HSA

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved

Region 1

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114FR0102 (Franz Creek at Chalk Hill Road).

Temporal Representation:

The samples were collected between the dates of 2019-01-06 and 2019-01-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

326184

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 49 of 76 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 114RR4234 (Russian River at Alexander Valley Campground-114RR4234).

Temporal Representation:

The samples were collected between the dates of 2011-05-19 and 2019-06-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

111595

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-06-14 and 2011-10-04.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104970

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5748)

Temporal Representation:

The samples were collected between the dates of 2011-06-09 and 2011-10-06.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104963

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR4751_SWAMP)

Temporal Representation:

The samples were collected between the dates of 2011-06-09 and 2011-10-06

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

104967

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Oxygen, Dissolved.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (114RR5652)

Temporal Representation:

The samples were collected on 9/28/10, 8/3/11, and 10/12/11.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

LOE ID: 326298 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Fish Spawning Number of Samples: 26 Number of Exceedances: 4 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 4 of 26 samples exceeded the water quality threshold for Oxygen, Dissolved. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: 114RR5407 (Russian River at Cloverdale Airport). Temporal Representation: The samples were collected between the dates of 2016-07-27 and 2019-08-19 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328879 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Fish Spawning Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463400 (RUSSIAN R A ASTI CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328856 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Fish Spawning Number of Samples: 3 Number of Exceedances: 1 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 3 samples exceeded the water quality threshold for Oxygen, Dissolved. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463682 (RUSSIAN R A JIMTOWN CA). Temporal Representation: The samples were collected between the dates of 2015-08-13 and 2016-10-28 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328852 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Fish Spawning Number of Samples: 7 Number of Exceedances: 1 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 7 samples exceeded the water quality threshold for Oxygen, Dissolved. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463980 (RUSSIAN R A DIGGER BEND NR HEALDSBURG CA). Temporal Representation: The samples were collected between the dates of 2014-09-15 and 2017-11-06 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328835 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Fish Spawning Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Oxygen, Dissolved. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328831 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Fish Spawning Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Oxygen, Dissolved. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463000 (RUSSIAN R NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2015-07-08 and 2017-07-06 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328797 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Fish Spawning Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328787 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Fish Spawning Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA). Temporal Representation: The samples were collected between the dates of 2017-05-01 and 2017-05-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328876 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Oxygen, Dissolved. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for COLD beneficial use waters to be a daily minimum of 6.0 mg/L and a 7-day moving average of 8.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463682 (RUSSIAN R A JIMTOWN CA). Temporal Representation: The samples were collected between the dates of 2015-08-13 and 2016-10-28 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328875 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for COLD beneficial use waters to be a daily minimum of 6.0 mg/L and a 7-day moving average of 8.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-383719122462501 (MAACAMA C A CHALK HILL RD BR NR HEALDSBURG CA). Temporal Representation: The samples were collected between the dates of 2017-05-01 and 2017-05-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328870 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Oxygen, Dissolved. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for COLD beneficial use waters to be a daily minimum of 6.0 mg/L and a 7-day moving average of 8.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463200 (BIG SULPHUR C NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2018-06-10 and 2018-06-10 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328781 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Fish Spawning Number of Samples: 2 Number of Exceedances: 1 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed EPA National Aquatic Resources Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 1 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River). Temporal Representation: The samples were collected between the dates of 2013-08-26 and 2013-09-25 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328826 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 7 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Oxygen, Dissolved. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for COLD beneficial use waters to be a daily minimum of 6.0 mg/L and a 7-day moving average of 8.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463980 (RUSSIAN R A DIGGER BEND NR HEALDSBURG CA). Temporal Representation: The samples were collected between the dates of 2014-09-15 and 2017-11-06 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328804 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Oxygen, Dissolved. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for COLD beneficial use waters to be a daily minimum of 6.0 mg/L and a 7-day moving average of 8.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463000 (RUSSIAN R NR CLOVERDALE CA). Temporal Representation: The samples were collected between the dates of 2015-07-08 and 2017-07-06 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328798 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed EPA National Aquatic Resources Survey (NARS) data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for COLD beneficial use waters to be a daily minimum of 6.0 mg/L and a 7-day moving average of 8.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: NARS_WQX-CAR9-0903 (Russian River). Temporal Representation: The samples were collected between the dates of 2013-08-26 and 2013-09-25 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 328796 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Cold Freshwater Habitat Number of Samples: 2 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed USGS California Water Science Center data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Oxygen, Dissolved. Data Reference: WQX from the NWQMP for the 2026 Integrated Report in Region 1 SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for COLD beneficial use waters to be a daily minimum of 6.0 mg/L and a 7-day moving average of 8.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site: USGS-11463150 (RUSSIAN R A PRESTON CA). Temporal Representation: The samples were collected between the dates of 2017-06-11 and 2018-06-08 Environmental Conditions: QAPP Information: QAPP not required for USGS projects QAPP Information Reference(s): QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 112474 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP Perennial Stream Surveys data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Oxygen, Dissolved. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for COLD beneficial use waters to be a daily minimum of 6.0 mg/L and a 7-day moving average of 8.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114PS0229) Temporal Representation: The samples were collected between the dates of 2013-06-04 and 2013-06-04 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104957 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 18 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Oxygen, Dissolved. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for COLD beneficial use waters to be a daily minimum of 6.0 mg/L and a 7-day moving average of 8.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR3119_SWAMP) Temporal Representation: The samples were collected between the dates of 2011-06-14 and 2011-10-04 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 111596 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning Number of Samples: 4 Number of Exceedances: 2 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 2 of 4 samples exceeded the water quality standard for Oxygen, Dissolved. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2011-05-19 to 2011-05-31 and on 2014-02-03. Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104965 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning Number of Samples: 1 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Oxygen, Dissolved. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4751_SWAMP) Temporal Representation: The sample was collected on 2011-05-26. Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 111595 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 18 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Oxygen, Dissolved. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for COLD beneficial use waters to be a daily minimum of 6.0 mg/L and a 7-day moving average of 8.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4234_SWAMP) Temporal Representation: The samples were collected between the dates of 2011-06-14 and 2011-10-04. Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104970 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 18 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Oxygen, Dissolved. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for COLD beneficial use waters to be a daily minimum of 6.0 mg/L and a 7-day moving average of 8.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5748) Temporal Representation: The samples were collected between the dates of 2011-06-09 and 2011-10-06. Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104963 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 18 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Oxygen, Dissolved. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for COLD beneficial use waters to be a daily minimum of 6.0 mg/L and a 7-day moving average of 8.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR4751_SWAMP) Temporal Representation: The samples were collected between the dates of 2011-06-09 and 2011-10-06 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157575, Oxygen, Dissolved	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID: 104967 Pollutant: Oxygen, Dissolved LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Beneficial Use: Cold Freshwater Habitat Number of Samples: 3 Number of Exceedances: 0 Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Russian River HU, Middle Russian River HA, Geyserville HSA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Oxygen, Dissolved. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . SWAMP Data: SWAMP Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for COLD beneficial use waters to be a daily minimum of 6.0 mg/L and a 7-day moving average of 8.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s) (114RR5652) Temporal Representation: The samples were collected on 9/28/10, 8/3/11, and 10/12/11. Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	75402	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Sedimentation/Siltation
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)(2016)
Revision Status	Original
Sources:	Flow Alteration/Regulation/Modification \| Removal of Riparian Vegetation
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the section 303(d) list under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. It should be noted that data from a third LOE (1745) were re-evaluated in LOE 31150 (and LOE 46509 in the Geyserville HSA water body). Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the section 303(d) list. This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. (3) 303(d) listing determinations made prior to 2006 were not held in an assessment database. LOE 4764 is a placeholder for the 303(d) listing data and information from a previous assessment cycle that was initially utilized to make this listing determination. (4) Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.

Regional Board Decision Recommendation:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:	Sediment impacts in Russian River tributaries prompted listing entire Russian River watershed for sediment TMDL.

Line of Evidence (LOE) for Decision ID 75402, Sedimentation/Siltation	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

1745

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

Draft QAPP for Volunteer Water Quality Monitoring Project for the Community Clean Water Institute.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 75402, Sedimentation/Siltation	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

31550

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

RUS080 and RUS090 were sampled once a month, January through May 2003, and in July and August 2003. Samples were taken on the same days of the month at each location.

Environmental Conditions:

QAPP Information:

Draft QAPP for Volunteer Water Quality Monitoring Project for the Community Clean Water Institute.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 75402, Sedimentation/Siltation	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

4764

Pollutant:

Sedimentation/Siltation

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

Unspecified

QAPP Information Reference(s):


DECISION ID	75402	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Sedimentation/Siltation
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)(2016)
Revision Status	Original
Sources:	Flow Alteration/Regulation/Modification \| Removal of Riparian Vegetation
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the section 303(d) list under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. It should be noted that data from a third LOE (1745) were re-evaluated in LOE 31150 (and LOE 46509 in the Geyserville HSA water body). Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the section 303(d) list. This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. (3) 303(d) listing determinations made prior to 2006 were not held in an assessment database. LOE 4764 is a placeholder for the 303(d) listing data and information from a previous assessment cycle that was initially utilized to make this listing determination. (4) Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.

Regional Board Decision Recommendation:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:	Sediment impacts in Russian River tributaries prompted listing entire Russian River watershed for sediment TMDL.

Line of Evidence (LOE) for Decision ID 75402, Sedimentation/Siltation	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

1745

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

Draft QAPP for Volunteer Water Quality Monitoring Project for the Community Clean Water Institute.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 75402, Sedimentation/Siltation	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

31550

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

RUS080 and RUS090 were sampled once a month, January through May 2003, and in July and August 2003. Samples were taken on the same days of the month at each location.

Environmental Conditions:

QAPP Information:

Draft QAPP for Volunteer Water Quality Monitoring Project for the Community Clean Water Institute.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 75402, Sedimentation/Siltation	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

4764

Pollutant:

Sedimentation/Siltation

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

Unspecified

QAPP Information Reference(s):


DECISION ID	78098	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Phenol
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the Section 303(d) List under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status. One line of evidence is available to assess protection of the cold freshwater habitat (COLD) beneficial use and one line of evidence is available to assess the warm freshwater habitat (WARM) beneficial use. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (3) Zero of three water samples exceed the criteria used to assess both the COLD and WARM beneficial uses, and this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (A) 16 samples, or (B) greater than or equal 2 exceedances of the objective with less than 16 samples is needed for application of Table 3.1. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 78098, Phenol	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42998

Pollutant:

Nonylphenol

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to nonylphenol is 6.6 ug/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 78098, Phenol	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43058

Pollutant:

Nonylphenol

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to nonylphenol is 6.6 ug/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan


DECISION ID	78098	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Phenol
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the Section 303(d) List under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status. One line of evidence is available to assess protection of the cold freshwater habitat (COLD) beneficial use and one line of evidence is available to assess the warm freshwater habitat (WARM) beneficial use. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (3) Zero of three water samples exceed the criteria used to assess both the COLD and WARM beneficial uses, and this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (A) 16 samples, or (B) greater than or equal 2 exceedances of the objective with less than 16 samples is needed for application of Table 3.1. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 78098, Phenol	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

42998

Pollutant:

Nonylphenol

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to nonylphenol is 6.6 ug/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 78098, Phenol	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

43058

Pollutant:

Nonylphenol

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to nonylphenol is 6.6 ug/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Russian River HU, Middle Russian River HA, Geyserville HSA was collected at 1 monitoring site [ Russian River at Crocker Road - 114RR5652]

Temporal Representation:

Data was collected over the time period 11/26/2007-7/14/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan


DECISION ID	68478	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Phosphorus
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the Section 303(d) List under Section 3.1 of the Listing Policy. Under Section 3.1 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant (LOEs 6212 and 46511). It should be noted that a third LOE from the 2006 Integrated Report cycle (LOE 1744) was not used in this decsions as the data were re-evaluated in LOEs 46511 in this water body and 46510 in Guerneville HSA. It is unknown if any of the phosphorus samples exceed the water quality objective as there is insufficient information available to determine exceedance. Specifically, the samples cannot be compared to the objective because diel samples for dissolved oxygen (DO), pH, and/or chlorophyll-a are not available. Nutrients such as phosphorus do not impair beneficial uses by themselves, or cause non-attainment of the objective. Rather, they cause indirect impacts through algal growth and extreme diel patterns for DO and pH, which then impair uses. Waterbody-specific factors such as riparian cover, flow conditions, and stream channel configuration also affect how nutrients are processed within the stream and play a large role in determining whether or not nuisance algal conditions will prevail. For these reasons, comparing a single nutrient value to the biostimulatory objective is not recommended. Instead, nutrient-related indicator parameters, such as diel measurements of DO, pH, and/or chlorophyll-a, should be evaluated to determine attainment of the objective and protection of beneficial uses. When nutrient-related indicator parameters exceed targets, nutrient concentrations will then be analyzed to determine whether phosphorus should be added to a possible listing under the 303(d) List. Therefore, the weight of evidence indicates that there is insufficient information available to determine if it is appropriate to place this water segment-pollutant combination on the Section 303(d) List in the Water Quality Limited Segments category. This conclusion is also based on the staff findings that: (1) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (3) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Note: Lines of evidence for both orthophosphate and total dissolved phosphorus data support this Decision. Total dissolved phosphorus includes orthophosphate. Phosphorus is used as the pollutant for this Decision because it includes both fractions and is easier to understand its relationship to other nutrients and the water quality objective.

Regional Board Decision Recommendation:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 68478, Phosphorus	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

6212

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

It is unknown whether any of the 2 phosphorus samples collected in Foss Creek exceed the objective as there is insufficient information available to determine exceedance. Specifically, the samples cannot be compared to the objective because diel samples for dissolved oxygen (DO), pH, and/or chlorophyll-a are not available. Nutrients, such as phosphorus, alone do not impair beneficial uses or cause non-attainment of the objective. Rather, they cause indirect impacts through algal growth and extreme diel patterns for DO and pH, which then impair uses. Waterbody-specific factors such as riparian cover, flow conditions, and stream channel configuration also affect how nutrients are processed within the stream and play a large role in determining whether or not nuisance algal conditions will prevail. For these reasons, comparing a single nutrient value to the biostimulatory objective is not recommended. Instead, nutrient-related indicator parameters, such as diel measurements of DO, pH, and/or chlorophyll-a, should be evaluated to determine attainment of the objective and protection of beneficial uses. When nutrient-related indicator parameters exceed targets, nutrient concentrations will then be analyzed to determine whether phosphorus should be added to a possible listing under the 303(d) List. The samples ranged from 0.32 to 0.62 mg/l. The samples were collected as part of the Russian River First Flush sampling event. Data are summarized by Katznelson et al. (2003).

Data Reference:

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance, or that otherwise adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from 2 sites in Foss Creek as follows: (1) in Foss Creek in downtown Healdsburg, and (2) in Upper Foss Creek.

Temporal Representation:

The samples were collected on November 7, 2002. At each site, 3 instantaneous grab samples were collected over half hour increments. The data are averaged for each site.

Environmental Conditions:

Samples were collected during the first runoff event of the rainy season.

QAPP Information:

Samples were collected in accordance with the study plan and quality control procedures described by Katznelson et al. (2003).

QAPP Information Reference(s):

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

Line of Evidence (LOE) for Decision ID 68478, Phosphorus	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

1744

Pollutant:

Phosphate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Of the total 8 samples from the three sites values ranged from non-detectable to 0.163 mg/L (Sandler, 2004).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Basin Plan does not have a water quality objective for orthophosphate.

Objective/Criterion Reference:

Evaluation Guideline:

There is no appropriate interpretive evaluation guideline for orthophosphate.

Guideline Reference:

303(d) list solicitation submittal data. 2004. Occidental, CA: Community Clean Water Institute

Spatial Representation:

Sampling was limited to three locations along the Russian River, one at Healdsburg, and two at Cloverdale. Sample site RUS070 is located at the Healdsburg Veteran's beach, Healdsburg. Sample site RUS080 is located at the Cloverdale 1st St. bridge, Cloverdale. Sample site RUS090 is located at the Cloverdale River Park, Cloverdale.

Temporal Representation:

RUS070 was sampled once in April 2003.
RUS080 was sampled once a month April through August 2003.
RUS090 was sampled once in May, once in July and once in August 2003.

Environmental Conditions:

QAPP Information:

Draft QAPP for Volunteer Water Quality Monitoring Project for the Community Clean Water Institute.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 68478, Phosphorus	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

46511

Pollutant:

Phosphate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Orthophosphate values for the 7 samples from the two sites ranged from non-detectable to 0.163 mg/L (Sandler, 2004). This LOE and LOE 46510 contain data originally evaluated in LOE 1744, which included data from a site that is not in this water body. The data from LOE 1744 have been split into two LOEs, with data now evaluated under the correct water body.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Basin Plan does not have a water quality objective for orthophosphate.

Objective/Criterion Reference:

Evaluation Guideline:

There is no appropriate interpretive evaluation guideline for orthophosphate.

Guideline Reference:

303(d) list solicitation submittal data. 2004. Occidental, CA: Community Clean Water Institute

Spatial Representation:

Sampling was limited to two locations along the Russian River at Cloverdale. Sample site RUS080 is located at the Cloverdale 1st St. bridge, Cloverdale. Sample site RUS090 is located at the Cloverdale River Park, Cloverdale.

Temporal Representation:

RUS080 was sampled once in April, once in May, once in July, and once in August 2003. RUS090 was sampled once in May, once in July and once in August 2003.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Draft QAPP for Volunteer Water Quality Monitoring Project for the Community Clean Water Institute

QAPP Information Reference(s):


DECISION ID	68478	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Phosphorus
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the Section 303(d) List under Section 3.1 of the Listing Policy. Under Section 3.1 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant (LOEs 6212 and 46511). It should be noted that a third LOE from the 2006 Integrated Report cycle (LOE 1744) was not used in this decsions as the data were re-evaluated in LOEs 46511 in this water body and 46510 in Guerneville HSA. It is unknown if any of the phosphorus samples exceed the water quality objective as there is insufficient information available to determine exceedance. Specifically, the samples cannot be compared to the objective because diel samples for dissolved oxygen (DO), pH, and/or chlorophyll-a are not available. Nutrients such as phosphorus do not impair beneficial uses by themselves, or cause non-attainment of the objective. Rather, they cause indirect impacts through algal growth and extreme diel patterns for DO and pH, which then impair uses. Waterbody-specific factors such as riparian cover, flow conditions, and stream channel configuration also affect how nutrients are processed within the stream and play a large role in determining whether or not nuisance algal conditions will prevail. For these reasons, comparing a single nutrient value to the biostimulatory objective is not recommended. Instead, nutrient-related indicator parameters, such as diel measurements of DO, pH, and/or chlorophyll-a, should be evaluated to determine attainment of the objective and protection of beneficial uses. When nutrient-related indicator parameters exceed targets, nutrient concentrations will then be analyzed to determine whether phosphorus should be added to a possible listing under the 303(d) List. Therefore, the weight of evidence indicates that there is insufficient information available to determine if it is appropriate to place this water segment-pollutant combination on the Section 303(d) List in the Water Quality Limited Segments category. This conclusion is also based on the staff findings that: (1) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (3) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Note: Lines of evidence for both orthophosphate and total dissolved phosphorus data support this Decision. Total dissolved phosphorus includes orthophosphate. Phosphorus is used as the pollutant for this Decision because it includes both fractions and is easier to understand its relationship to other nutrients and the water quality objective.

Regional Board Decision Recommendation:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:

Line of Evidence (LOE) for Decision ID 68478, Phosphorus	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

6212

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from 2 sites in Foss Creek as follows: (1) in Foss Creek in downtown Healdsburg, and (2) in Upper Foss Creek.

Temporal Representation:

The samples were collected on November 7, 2002. At each site, 3 instantaneous grab samples were collected over half hour increments. The data are averaged for each site.

Environmental Conditions:

Samples were collected during the first runoff event of the rainy season.

QAPP Information:

Samples were collected in accordance with the study plan and quality control procedures described by Katznelson et al. (2003).

QAPP Information Reference(s):

2002 Russian River First Flush Summary Report. Clean Water Team, Citizen Monitoring Program of the State Water Resources Control Board

Line of Evidence (LOE) for Decision ID 68478, Phosphorus	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

1744

Pollutant:

Phosphate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Of the total 8 samples from the three sites values ranged from non-detectable to 0.163 mg/L (Sandler, 2004).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Basin Plan does not have a water quality objective for orthophosphate.

Objective/Criterion Reference:

Evaluation Guideline:

There is no appropriate interpretive evaluation guideline for orthophosphate.

Guideline Reference:

303(d) list solicitation submittal data. 2004. Occidental, CA: Community Clean Water Institute

Spatial Representation:

Temporal Representation:

RUS070 was sampled once in April 2003.
RUS080 was sampled once a month April through August 2003.
RUS090 was sampled once in May, once in July and once in August 2003.

Environmental Conditions:

QAPP Information:

Draft QAPP for Volunteer Water Quality Monitoring Project for the Community Clean Water Institute.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 68478, Phosphorus	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

46511

Pollutant:

Phosphate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Basin Plan does not have a water quality objective for orthophosphate.

Objective/Criterion Reference:

Evaluation Guideline:

There is no appropriate interpretive evaluation guideline for orthophosphate.

Guideline Reference:

303(d) list solicitation submittal data. 2004. Occidental, CA: Community Clean Water Institute

Spatial Representation:

Temporal Representation:

RUS080 was sampled once in April, once in May, once in July, and once in August 2003. RUS090 was sampled once in May, once in July and once in August 2003.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Draft QAPP for Volunteer Water Quality Monitoring Project for the Community Clean Water Institute

QAPP Information Reference(s):


DECISION ID	169056	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Sediment
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Original
Sources:	Flow Alteration/Regulation/Modification \| Removal of Riparian Vegetation
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant was formerly assessed under the pollutant name Sedimentation/Siltation. This pollutant is being considered for removal from the CWA section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. The original 303(d) listing was made prior to 2006. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. The original 303(d) listing was made prior to 2006 and this exceeds the allowable frequency listed in Table 4.2 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met. This listing applies to the entire waterbody. This listing applies to the entire waterbody.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:	This listing applies to the entire waterbody.

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:	This listing applies to the entire waterbody.

Line of Evidence (LOE) for Decision ID 169056, Sediment	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

4764

Pollutant:

Sedimentation/Siltation

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

Unspecified

QAPP Information Reference(s):


DECISION ID	169056	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

Pollutant:	Sediment
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Original
Sources:	Flow Alteration/Regulation/Modification \| Removal of Riparian Vegetation
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant was formerly assessed under the pollutant name Sedimentation/Siltation. This pollutant is being considered for removal from the CWA section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. The original 303(d) listing was made prior to 2006. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. The original 303(d) listing was made prior to 2006 and this exceeds the allowable frequency listed in Table 4.2 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met. This listing applies to the entire waterbody. This listing applies to the entire waterbody.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:	This listing applies to the entire waterbody.

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Listing Extent:	This listing applies to the entire waterbody.

Line of Evidence (LOE) for Decision ID 169056, Sediment	Region 1
Russian River HU, Middle Russian River HA, Geyserville HSA

LOE ID:

4764

Pollutant:

Sedimentation/Siltation

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference: