Draft California 2024 Integrated Report (303(d) List/305(b) Report)

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline value for bifenthrin, 0.043 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 0.43 ug/g OC). The LC50 (0.43 ug/g OC) is the geometric mean of OC-normalized 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:

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 was collected at one monitoring site [ American R @ Discovery Park - 519AMNDVY]

Temporal Representation:

Data was collected on 7/16/2008.

Environmental Conditions:

Staff is not 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 146227, Bifenthrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

186584

Pollutant:

Bifenthrin

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 RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Bifenthrin. Although a total of 2 samples were collected, 2 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:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

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 for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)

Evaluation Guideline:

The chronic concentration goal 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:

Amendment to the Water Quality Control Plan for the Sacramento River and San Joaquin River Basins for the Control of Pyrethroid Pesticide Discharges

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (519SAC111).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-12-16 to 2010-12-19

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 146227, Bifenthrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

186647

Pollutant:

Bifenthrin

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 RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 1 of the 1 samples exceeded the water quality threshold for Bifenthrin. Although a total of 2 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:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

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:

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

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (519SAC126).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-12-18 to 2010-12-19

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 146227, Bifenthrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

186602

Pollutant:

Bifenthrin

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:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

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:

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

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (519LSAC53).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-12-18 to 2010-12-19

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 146227, Bifenthrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

215100

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:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 3 of 6 samples exceeded the water quality threshold for Bifenthrin.

Data Reference:

Data for Various Pollutants in American River, 2009-2010.

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:

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

Guideline Reference:

Spatial Representation:

Samples were collected along the bank of the American River at Sunrise Blvd, Howe Avenue and Discovery Park.

Temporal Representation:

Samples were collected after four storm events in February to May 2009, and once in March 2009 after two weeks with no rain. Samples were also collected during a 2 day storm event (October 13-14, 2009) and a 6 day storm event from January 17-22, 2010.

Environmental Conditions:

QAPP Information:

Data quality: Excellent. Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 146227, Bifenthrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293548

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:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

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:

Evaluation Guideline:

The chronic concentration goal for bifenthrin is 0.1 ng/LÂ (expressed as a 4-day average).Â If the freely dissolved concentrations of bifenthrin were reported or could be calculated then these values were used for this assessment.Â 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

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-12-16 to 2010-12-19

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146227, Bifenthrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

215099

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:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Bifenthrin. 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 RWB5 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:

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

Guideline Reference:

Spatial Representation:

Data was collected from 2 station(s) (Station Code(s) 519LSAC53, 519SAC111).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-12-16 to 2010-12-19

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program Â

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 146227, Bifenthrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

215101

Pollutant:

Bifenthrin

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:

Data for Various Pollutants in American River, 2009-2010.

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:

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

Guideline Reference:

Spatial Representation:

Samples were collected along the bank of the American River at Sunrise Blvd, Howe Avenue, and Discovery Park.

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 146227, Bifenthrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293549

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support and the results are as follows: 1 of the 1 samples exceeded the water quality threshold for Bifenthrin. Although a total of 13 samples were collected, 12 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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-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:

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

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Nimbus).

Temporal Representation:

Data for this waterbody was collected over the date range 2011-04-19 to 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146227, Bifenthrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297218

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:

Water Board staff assessed SWAMP Stream Pollution Trends data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 6 of the 7 samples exceeded the evaluation guideline for Bifenthrin. Although a total of 9 samples were collected, 2 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:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for bifenthrin, 0.043 ug/g, is one-tenth of the median lethal concentration (LC50; 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:

Whole-sediment toxicity identification evaluation tools for pyrethroid insecticides: I. piperonyl butoxide addition. Environ. Toxicol. Chem. 26:2389-2396.

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-08-19 to 2019-07-18

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146227, Bifenthrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293568

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 8 of the 9 samples exceeded the water quality threshold for Bifenthrin. Although a total of 18 samples were collected, 9 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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-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:

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

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Discovery).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-10-24 to 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB5 Monitoring

Line of Evidence (LOE) for Decision ID 146227, Bifenthrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

215098

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:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Bifenthrin. 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:

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:

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

Guideline Reference:

Spatial Representation:

Data was collected from 2 station(s) (Station Code(s) 519LSAC53, 519SAC111).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-12-16 to 2010-12-19

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program Â

QAPP Information Reference(s):

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


DECISION ID	148725	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Indicator Bacteria
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)(2020)
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2027
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. The State Water Board’s Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California (the “ISWEBE Plan”) contains two bacteria water quality objectives applicable to the REC-1 beneficial use, which were adopted on August 7, 2018. Because the salinity level of this waterbody is equal to or less than 1 part per thousand 95 percent or more of the time, the E. coli bacteria objective applies Therefore, this waterbody is being considered for removal from the CWA section 303(d) List under section 4.3 of the Listing Policy using the E. coli objective. A total of 57 lines of evidence of E. coli data were evaluated for this waterbody. Of these lines of evidence, two are based on historic E. coli data collected prior to 2010. Nineteen are based on recent E.coli data, collected since 2010, and compared to the newer E. coli bacteria water quality objective. In accordance with section 6.1.5.3 of the Listing Policy, data should be representative of the critical timing that the pollutant is expected to impact the waterbody. Indicator bacteria (total coliform, fecal coliform, E. coli, enterococci) populations may fluctuate substantially on a daily, seasonal, or yearly basis. Lacking constant inputs, they do not persist in the environment for a long period and effects are of relatively short duration. As a result, the historic levels of indicator bacteria in the waterbody may be a poor indicator of current risks to human health, particularly when more recent data are available to sufficiently assess the water quality standard. Unrepresentative data may result in incorrectly placing or not placing a water body segment on the list, which could result in the unnecessary expenditure of public resources or missing a human health problem. The two historic lines of evidence were evaluated pursuant to these considerations and were not used to assess water quality standards attainment because they do not meet the temporal representation requirements of section 6.1.5.3 of the Listing Policy. The 55 recent E. coli lines of evidence were relied upon to assess water quality standards attainment in this waterbody. The data were collected from 2010-2020. There are adequate data to determine beneficial use support in accordance with the Listing Policy. The data are representative of existing conditions in the waterbody and represent a range of hydrologic conditions (both wet and dry years). With respect to the recent lines of evidence, 149 of 692 geometric means and 124 of 538 STV for E. coli calculated from 2010 to 2020 exceed the E. coli bacteria objective. For these data, Listing Policy section 4.3 instructs to use the binomial distribution table in section 4.2. Using this exceedance frequency, the number of exceedances is not sufficient to remove this waterbody from the list. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification to against removing this waterbody from the list. The data used satisfy 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 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.

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301062

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 6 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The bacteria water quality objective applicable to all waters, except Lake Tahoe, where the salinity is less than 10 parts per thousand (ppth) 95 percent or more of the time is a six-week rolling GEOMETRIC MEAN (GM) of Escherichia coli (E. coli) not to exceed 100 colony forming units per 100 milliliters (cfu/100 mL) (calculated weekly).

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC110 (American River at Paradise Beach Downstream right bank).

Temporal Representation:

The samples were collected between the days of 2019-08-13 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301069

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 6 of the 35 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC104 (American River at Sutter's Landing Regional Park).

Temporal Representation:

The samples were collected between the days of 2019-03-12 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301100

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 31 of the 70 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The bacteria water quality objective applicable to all waters, except Lake Tahoe, where the salinity is less than 10 parts per thousand (ppth) 95 percent or more of the time is a STATISTICAL THRESHOLD VALUE (STV) of 320 cfu/100 mL not to be exceeded more than 10 percent of the time (calculated monthly).

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

The samples were collected between the days of 2010-11-09 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301103

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 3 of the 5 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC119 (American River at Sutters Landing Regional Park right bank).

Temporal Representation:

The samples were collected between the days of 2019-08-13 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301114

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC118 (American River at Sutters Landing Regional Park midstream).

Temporal Representation:

The samples were collected between the days of 2019-08-13 and 2019-10-01 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301131

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 4 of the 15 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 514SAC009 (American River at North 10th Street).

Temporal Representation:

The samples were collected between the days of 2019-03-12 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301133

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 2 of the 15 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC105 (American River near Glenn Hall Park).

Temporal Representation:

The samples were collected between the days of 2019-03-12 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301147

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 14 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519LSAC52 (American R at Lower Sunrise Area).

Temporal Representation:

The samples were collected between the days of 2019-03-12 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301072

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 1 of the 28 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC106 (American River at Camp Pollock).

Temporal Representation:

The samples were collected between the days of 2019-03-12 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301145

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC107 (American River at Paradise Beach Upstream midstream).

Temporal Representation:

The samples were collected between the days of 2019-08-13 and 2019-09-03 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301160

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 3 of the 14 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519LSAC53 (American R at Howe Ave Access).

Temporal Representation:

The samples were collected between the days of 2019-03-12 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301079

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 6 of the 6 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC119 (American River at Sutters Landing Regional Park right bank).

Temporal Representation:

The samples were collected between the days of 2019-08-13 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301101

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 2 of the 15 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC104 (American River at Sutter's Landing Regional Park).

Temporal Representation:

The samples were collected between the days of 2019-03-12 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301197

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support and the results are as follows: 3 of the 19 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the days of 2010-10-05 and 2015-05-12 .

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301117

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 5 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC110 (American River at Paradise Beach Downstream right bank).

Temporal Representation:

The samples were collected between the days of 2019-08-13 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301059

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 28 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519LSAC53 (American R at Howe Ave Access).

Temporal Representation:

The samples were collected between the days of 2019-03-12 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59677

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

SWAMP data indicates that one of two sample results exceed the evaluation guideline value for Escherichia coli.

Data Reference:

RWB5 Bacti Source ID FY0809

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

Evaluation Guideline:

The U.S. EPA recommended objective for a single-sample maximum allowable density of E. coli in freshwater designated-beach areas is 235 MPN/100mL.

Guideline Reference:

40 CFR Part 131 Water Quality Standards for Coastal and Great Lakes Recreation Waters; Final Rule [Federal Register / Vol. 69, No. 220]

Spatial Representation:

Data for this line of evidence was collected at one monitoring site [ American R @ Discovery Park - 519AMNDVY]

Temporal Representation:

Data was collected over the time period 5/18/2009-5/26/2009.

Environmental Conditions:

Staff is not 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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59667

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

SWAMP data indicates that 4 of 14 sample results exceed the evaluation guideline value for Escherichia coli.

Data Reference:

RWB5 Safe to Swim FY0708 FY0809

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

Evaluation Guideline:

The U.S. EPA recommended objective for a single-sample maximum allowable density of E. coli in freshwater designated-beach areas is 235 MPN/100mL.

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:

Data for this line of evidence was collected at 6 monitoring sites [ American River at Hagan Community Park - 514SAC012, American River at Watt Ave Bridge - 514SAC011, American River at H Street_Fair Oaks - 514SAC010, American River at North 10th Street - 514SAC009, American R @ Discovery Park - 519AMNDVY, American R at Lower Sunrise Area - 519LSAC52]

Temporal Representation:

Data was collected over the time period 8/30/2007-6/30/2009.

Environmental Conditions:

Staff is not 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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

194489

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 53 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519LSAC53

Temporal Representation:

The samples were collected between the days of 2014-04-10 and 2019-02-28 .

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

194494

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 31 of the 45 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519AMNSAC

Temporal Representation:

The samples were collected between the days of 2013-05-28 and 2019-02-28 .

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

194554

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 25 of the 54 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 514SAC009

Temporal Representation:

The samples were collected between the days of 2011-04-20 and 2019-02-28 .

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

194558

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 2 of the 28 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519LSAC53

Temporal Representation:

The samples were collected between the days of 2014-04-10 and 2019-02-28 .

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

194560

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 1 of the 32 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC102

Temporal Representation:

The samples were collected between the days of 2011-04-20 and 2019-02-28 .

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

194562

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 25 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC103

Temporal Representation:

The samples were collected between the days of 2011-04-20 and 2015-08-20 .

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

194563

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 2 of the 12 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC105

Temporal Representation:

The samples were collected between the days of 2015-07-16 and 2019-02-28 .

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

194566

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 6 of the 21 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC106

Temporal Representation:

The samples were collected between the days of 2015-08-27 and 2019-02-20 .

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

194568

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 4 of the 22 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC104

Temporal Representation:

The samples were collected between the days of 2015-07-16 and 2019-02-28 .

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

194584

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 18 of the 44 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 514SAC009

Temporal Representation:

The samples were collected between the days of 2011-04-20 and 2019-02-28 .

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

194586

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 2 of the 17 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 514SAC011

Temporal Representation:

The samples were collected between the days of 2011-04-20 and 2013-09-26 .

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

194587

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 17 of the 33 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519AMNSAC

Temporal Representation:

The samples were collected between the days of 2013-05-28 and 2019-02-28 .

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

194588

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 1 of the 33 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519LSAC52

Temporal Representation:

The samples were collected between the days of 2011-05-04 and 2019-02-28 .

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

194590

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 1 of the 13 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 514SAC012

Temporal Representation:

The samples were collected between the days of 2011-04-20 and 2013-09-26 .

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

194597

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 26 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519LSAC52

Temporal Representation:

The samples were collected between the days of 2011-05-04 and 2019-02-28 .

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

194598

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 23 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC105

Temporal Representation:

The samples were collected between the days of 2015-07-16 and 2019-02-28 .

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

194599

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 18 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC102

Temporal Representation:

The samples were collected between the days of 2011-04-20 and 2019-02-28 .

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

194615

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 4 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC103

Temporal Representation:

The samples were collected between the days of 2011-04-20 and 2015-08-20 .

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

194617

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 2 of the 49 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC104

Temporal Representation:

The samples were collected between the days of 2015-07-16 and 2019-02-28 .

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

194623

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 10 of the 45 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC106

Temporal Representation:

The samples were collected between the days of 2015-08-27 and 2019-02-20 .

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301073

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC118 (American River at Sutters Landing Regional Park midstream).

Temporal Representation:

The samples were collected between the days of 2019-08-13 and 2019-10-01 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301118

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 1 of the 14 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC102 (American River at River Bend Park).

Temporal Representation:

The samples were collected between the days of 2019-03-12 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301082

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 6 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC109 (American River at Paradise Beach Downstream left bank).

Temporal Representation:

The samples were collected between the days of 2019-08-13 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301042

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 36 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC105 (American River near Glenn Hall Park).

Temporal Representation:

The samples were collected between the days of 2019-03-12 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301190

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 5 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC108 (American River at Paradise Beach Upstream right bank).

Temporal Representation:

The samples were collected between the days of 2019-08-13 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301193

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 1 of the 5 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC109 (American River at Paradise Beach Downstream left bank).

Temporal Representation:

The samples were collected between the days of 2019-08-13 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301115

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 9 of the 14 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519AMNSAC (American-Sacramento Confluence Beach).

Temporal Representation:

The samples were collected between the days of 2019-03-12 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301078

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 3 of the 14 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC106 (American River at Camp Pollock).

Temporal Representation:

The samples were collected between the days of 2019-03-12 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301174

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 5 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC113 (American River Downstream of Business 80 right bank).

Temporal Representation:

The samples were collected between the days of 2019-08-13 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301081

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 5 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC108 (American River at Paradise Beach Upstream right bank).

Temporal Representation:

The samples were collected between the days of 2019-08-13 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301049

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

GeoMean

Beneficial Use:

Water Contact Recreation

Number of Samples:

109

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 46 of the 109 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

The samples were collected between the days of 2010-11-09 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301051

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 17 of the 17 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519AMNSAC (American-Sacramento Confluence Beach).

Temporal Representation:

The samples were collected between the days of 2019-03-12 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301061

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 28 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC102 (American River at River Bend Park).

Temporal Representation:

The samples were collected between the days of 2019-03-12 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301198

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 8 of the 19 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): Discovery (Discovery).

Temporal Representation:

The samples were collected between the days of 2010-10-05 and 2015-05-12 .

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301063

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 4 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC112 (American River Upstream of Business 80 left bank).

Temporal Representation:

The samples were collected between the days of 2019-08-13 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301071

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 6 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC113 (American River Downstream of Business 80 right bank).

Temporal Representation:

The samples were collected between the days of 2019-08-13 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301102

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 5 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519SAC112 (American River Upstream of Business 80 left bank).

Temporal Representation:

The samples were collected between the days of 2019-08-13 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301041

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 5 of the 31 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 514SAC009 (American River at North 10th Street).

Temporal Representation:

The samples were collected between the days of 2019-03-12 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 148725, Indicator Bacteria	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

301053

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 27 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 519LSAC52 (American R at Lower Sunrise Area).

Temporal Representation:

The samples were collected between the days of 2019-03-12 and 2020-06-30 .

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.


DECISION ID	153028	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Mercury
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)(2020)
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2010
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 4.5 and 4.11 of the Listing Policy. Under section 4.5 a single line of evidence is necessary to assess listing status. Under section 4.11 when all other delisting factors do not result in the delisting of a water segment but information indicates attainment of standards, a water segment shall be evaluated to determine whether the weight of evidence demonstrates that water quality standard is attained. If the weight of evidence indicates attainment, the water segment shall be removed from the CWA section 303(d) List. Twenty-three lines of evidence are available in the administrative record to assess pollutant. COLD beneficial use: Sediment - 0 of 6 sediment samples exceed the mercury evaluation guideline. Water - 0 of 1 dissolved water sample exceeds the mercury evaluation guideline. Water - 0 of 35 total water samples exceed the mercury evaluation guideline. COMM beneficial use: 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. Tissue - LOE 297189: 1 of 1 sample exceeds the mercury objective and consists of 9 trophic level 4 fish. Water - 0 of 3 dissolved water sample exceeds the mercury evaluation guideline. Water - 0 of 47 total water samples exceed the mercury evaluation guideline. WILD beneficial use: Fish used in the WILD assessment are limited to lengths that are within Calif. Dept. of Fish and Wildlife legal size limits applicable to this waterbody. LOE 297190: 1 of 1 sample exceeds the mercury objective and consists of 9 trophic level 4 fish. MUN beneficial use: Water - 0 of 3 dissolved water sample exceeds the mercury evaluation guideline. Water - 0 of 47 total water samples exceed the mercury evaluation guideline. COMM and MUN beneficial uses: 0 of 1 water samples exceeds the CTR. 0 of 0 samples exceed the tissue guideline used in an assessment before 2006. 0 of 0 indicates fish tissue samples exceeded the guideline. In addition, there is an OEHHA Fish Advisory for this waterbody. 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. CDFW legal size limit fish fillet tissue samples were compared with the sport fish objective and 1 of 1 samples exceed for WILD beneficial use and 1 of 1 samples exceed for the COMM beneficial use. The samples consist of trophic level 4 fish and are from a minimum of 2 annual averages and this exceeds the allowable frequency listed in Table 4.1 of the Listing Policy. 4. A health advisory is available and fish in the water exceed OEHHA guidelines. The samples had sufficient sample size (more than 9 fish per species) of legal/edible size fish to be considered representative of mercury levels in those species, thereby allowing adequate estimation of the health risks associated with their consumption. 5. 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:	This decision was made by SWRCB staff.

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 removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.

Line of Evidence (LOE) for Decision ID 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

295192

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 SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality threshold for Mercury, Methyl.

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

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. (Water Quality Control Plan for the Sacramento and San Joaquin River Basins).

Objective/Criterion Reference:

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: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2011-04-19 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297721

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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:

Non-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 total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2020-01-15 and 2020-07-23

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

295114

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 SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support and results are as follows: 0 of 21 samples exceeded the water quality threshold for Mercury.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The mercury criteria 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:

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: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

295115

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:

The mercury criteria 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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2010-12-06

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

295134

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The mercury criteria 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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

295172

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:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The mercury criteria 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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

295091

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The mercury criteria 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: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297719

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Mercury.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The mercury criteria 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: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2019-10-17 and 2020-07-23

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297720

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Mercury.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The mercury criteria 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: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2019-10-17 and 2020-07-23

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

Habitat, Tissue data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297189

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 Sportfish Rivers and Streams data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 1 of the 1 samples exceeded the water quality threshold for Mercury. This LOE contains data only for trophic level 4 fish. The concentration of Mercury in fish collected within the same calendar year, for the same trophic level were averaged into a single sample for comparison with the objective. A total of 9 fish were aggregated into 1 annual averages, which consisted of 1 fish species (9 composite(s) of Largemouth Bass each composed of 1 fish per composite). Of these annual averages, 1 average(s), (Year(s): 2011) exceeded the objective.This LOE does not contain data from fish who's average length was outside of the legal size limits as described by the California Department of Fish and Wildlife Fishing Regulations.

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. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this line of evidence were collected between 2011-09-19 and 2011-09-19. 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:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297190

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:

Data Reference:

Habitat, Tissue data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

2649

Pollutant:

Mercury

LOE Subgroup:

Testimonial Evidence

Matrix:

Not Specified

Fraction:

None

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Supporting documentation - Fish consumption study documenting overlaps of fishing intensities with mercury concentrations in fish. Concentrations >0.3 ppm have been measured in largemouth bass, Smallmouth and white bass, Sacramento pike minnow, Suckers sampled from the following American River.

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:

QA Info Missing

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59688

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:

SWAMP data indicates that 0 of the sample results exceed the evaluation guideline value for Mercury.

Data Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)

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 was collected at one monitoring site [ American R @ Discovery Park - 519AMNDVY]

Temporal Representation:

Data was collected on 7/16/2008.

Environmental Conditions:

Staff is not 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 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

202428

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:

Water Board staff assessed STORET data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The mercury criteria 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 (CALWR_WQX-A0D83441350)

Temporal Representation:

The samples were collected between the dates of 2014-12-22 and 2014-12-22

Environmental Conditions:

QAPP Information:

STORET

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 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

202335

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:

WQX data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The mercury criteria 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 (CALWR_WQX-A0D83441350)

Temporal Representation:

The samples were collected between the dates of 2014-12-22 and 2014-12-22

Environmental Conditions:

QAPP Information:

STORET

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 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

202427

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:

WQX data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The mercury criteria 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 (CALWR_WQX-A0D83441350)

Temporal Representation:

The samples were collected between the dates of 2014-12-22 and 2014-12-22

Environmental Conditions:

QAPP Information:

STORET

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 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

202501

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:

Data Reference:

WQX data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The mercury criteria 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 (CALWR_WQX-A0D83441350)

Temporal Representation:

The samples were collected between the dates of 2014-12-22 and 2014-12-22

Environmental Conditions:

QAPP Information:

STORET

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 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297371

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:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Mercury from MacDonald et al., 2000a which states that the probable effect concentration for Mercury is 1.06 mg/kg. (dw = Dry Weight)

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-08-19 to 2018-07-09

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

2650

Pollutant:

Mercury

LOE Subgroup:

Health Advisories

Matrix:

Tissue

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

USGS and UCD collected a total of 11 fish species by electrofishing equipment or gill nets in August 2000, from September to October 2002, and in July 2003, at several sites in Lake Natoma, including the vicinity of Negro Bar and Mississippi Bar, the mouths of Willow Creek and Alder Creek, Natomas Slough, and near Nimbus Dam (Saiki et al., 2004; Alpers et al., 2004; Klasing, S. and R. Brodberg, 2004). Species collected included largemouth bass, smallmouth bass, spotted bass, channel catfish, white catfish, brown bullhead, black bullhead, redear sunfish, green sunfish, bluegill, and rainbow trout. Fish were measured and weighed; boneless and skinless individual fillets were submitted to University of California - Davis (the August 2000, and July 2003, samples) or the USGS Columbia Environmental Research Center (CERC) in Columbia, Missouri, (the September to October, 2002, samples) for total mercury analyses by atomic absorption spectrophotometry using either a Perkin Elmer Flow Injection Mercury System or a Milestone DMA-80 analyzer. Under TSMP, the California Department of Fish and Game (CDFG) collected largemouth bass (n= 15 in three composites), pike minnow (n= 16 in three composites), and sucker samples (n = 35 in nine composites) by electrofishing equipment or gill nets in 1979-1983, 1987, and 1990-1993 near the Highway 160 and Watt Avenue bridges on the lower American River. Fish were measured and weighed and made into composites using skin-off muscle fillet. Composite samples were homogenized at the CDFG Water Pollution Control Laboratory and analyzed for total mercury by cold vapor atomic absorption spectrophotometry (TSMP, 2002). For the Sacramento River Watershed Program, largemouth bass (n = 26 in seven composites), striped bass (n = 1), pike minnow (n = 25 in five composites), sucker (n = 35 in seven composites), white catfish (n = 9 in two composites), and redear sunfish (n = 10 in two composites) were collected by electroshock, nets, or hook and line from 1997 to 2002 at known fishing locations on the lower American River from Sunrise Avenue to Discovery Park. Fish were measured and weighed and made into composites using skin-off muscle fillet. Composite samples were homogenized at Moss Landing Marine Laboratory and analyzed for total mercury using a Perkin Elmer Flow Injection Mercury System.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Fish consumption health advisory issued by OEHHA in September 2004.

Objective/Criterion Reference:

Evaluation Guideline:

OEHHA guidance tissue levels for mercury (Brodberg & Pollock, 1999).

Guideline Reference:

WQX data for the 2020/2022 integrated report in Region 5.

Spatial Representation:

Sample locations included Lake Natoma at Willow Creek, Mississippi Bar, Nimbus Dam, Alder Creek, Natomas Slough and Negro Bar; on the American River samples were taken at Discovery Park, d/s Watt Ave. bridge, and at Sunrise.

Temporal Representation:

Collection dates for USGS and UCD sampling data from Lake Natoma ranged from Aug. 2000, Sept. and Oct. 2002, and July 2003. SRWP data was collected in 1997, 1998, 1999, 2000, and 2001. Additionally, composite fish samples were collected as part of TSMP and SRWP, periodically from 1978 until 2002, from sections of the lower American River. Only mercury data were considered for this advisory.

Environmental Conditions:

Of the samples collected at Lake Natoma and the lower American River, largemouth bass (n = 64), bluegill (n = 78), pike minnow (n = 41), sucker (n = 70), channel catfish (n =11), white catfish (n = 10) and redear sunfish (n = 20) had sufficient sample size (≥ 9 fish per species) of legal/edible size fish to be considered representative of mercury levels in those species, thereby allowing adequate estimation of the health risks associated with their consumption.

QAPP Information:

QA Info Missing

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

202673

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:

Data Reference:

SWAMP Data:

Non-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 total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (CALWR_WQX-A0D83441350)

Temporal Representation:

The samples were collected between the dates of 2014-12-22 and 2014-12-22

Environmental Conditions:

QAPP Information:

STORET

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 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

202480

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/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-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 total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (CALWR_WQX-A0D83441350)

Temporal Representation:

The samples were collected between the dates of 2014-12-22 and 2014-12-22

Environmental Conditions:

QAPP Information:

STORET

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 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

295073

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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The mercury criteria 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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2010-12-06

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 153028, Mercury	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

295175

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:

Data Reference:

SWAMP Data:

Non-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 total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2011-04-19 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146199	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	PCBs (Polychlorinated biphenyls)
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
Expected TMDL Completion Date:	2037
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) list under section 3.5 (Bioaccumulation of Pollutants in Aquatic Life Tissue) of the Listing Policy. Under section 3.5 a single line of evidence is necessary to assess listing status. Seven lines of evidence are available in the administrative record to assess this pollutant. Two of four tissue samples exceed the water quality objective for PCBs in fish tissue. The single sediment sample does not exceed the evaluation guideline for total PCBs. Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification in favor of removing this water segment-pollutant combination on the 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. The levels of total PCBs in two of the four fish tissue samples exceed the OEHHA fish contaminant goal for human health (3.6 ng/g) and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. Total PCBs in the single sediment sample do not exceed the probable effect concentration (predictive of sediment toxicity) of 676 ug/Kg dry weight. 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 removed from the section 303(d) list because applicable water quality standards are still 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.

Line of Evidence (LOE) for Decision ID 146199, PCBs (Polychlorinated biphenyls)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296151

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The PCB, total aroclors 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:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-10-05 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146199, PCBs (Polychlorinated biphenyls)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297342

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:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Total PCBs from MacDonald et al., 2000a which states that the probable effect concentration for Total PCBs is 676 ug/kg. (dw = Dry Weight)

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-08-19 to 2017-08-01

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146199, PCBs (Polychlorinated biphenyls)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296153

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA 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 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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

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: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-10-05 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Habitat, Tissue data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146199, PCBs (Polychlorinated biphenyls)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297195

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:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146199, PCBs (Polychlorinated biphenyls)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297194

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:

Data Reference:

Habitat, Tissue data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146199, PCBs (Polychlorinated biphenyls)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59711

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 for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain substances in concentrations that result in the deposition of material that causes nuisance or adversely affects beneficial uses (Water Quality Control Plan for the Sacramento and San Joaquin River Basins).

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 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

The samples were collected on 7/16/2008.

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 146199, PCBs (Polychlorinated biphenyls)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

25699

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:

Fish tissue analysis

Data Used to Assess Water Quality:

Samples were analyzed for the presence of 48 individual PCB congeners and Aroclors 1248, 1254 and 1260. For the purpose of this assessment, data considered were the sum of PCB congeners (¿total PCBs¿), reported as ng/g, wet weight. The OEHHA and SWAMP recommend use of total PCBs for evaluating contamination. The values for each of the PCB congeners were surrogate corrected. For the purpose of determining the sum of PCB congeners, results for individual congeners that were below the reporting limit (0.199 ng/g) were treated as non-detects.

Total PCBs in 2 of 3 composite samples exceeded 3.6 ng/g. The two composite samples that exceeded the OEHHA fish contaminant goal for human health were the white catfish sample (3.934 ng/g) collected at American River at Discovery Park on 26 July 2005 and the Sacramento sucker sample (44.094 ng/g) collected at American River at Discovery Park on 18 October 2005. The composite sample that did not exceed the OEHHA fish contaminant goal for human health was a Sacramento sucker sample (2.438 ng/g) collected at American River at Nimbus Dam.

Composite samples consisted of equal-weight tissue samples from up to five fish of similar size and combined into a single 200 g composite sample (SRWP 2006).

Data Source - Sacramento River Watershed Program. Final Proposition 50 Grant Monitoring Report, 2005-2007 (SRWP 2008) and electronic files containing raw data supplied by Larry Walker and Associates.

Data Reference:

Final Proposition 50 Grant Monitoring Report, 2005 - 2007. Includes Quality Assurance Project Plan (QAPP) Revision 1.2.0, Appendix A, March 2006

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. The objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances.

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

Evaluation Guideline:

The California Office of Environmental Health Hazard Assessment (OEHHA) Fish Contaminant Goal for total PCBs in fish is 3.6 ng/g (3.6 ppb), wet weight, to protect human health. This concentration in fish tissue should not be exceeded, based on a total fish and shellfish consumption rate of 8 ounces per week (prior to cooking) (32 g/day) (OEHHA 2008). This goal incorporates a maximum cancer risk level of one in a million (no more than one additional cancer in a population of one million people consuming these fish).

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:

Fish samples were collected at American River at Discovery Park (white catfish and Sacramento sucker), and American River at Nimbus Dam (Sacramento sucker).

Temporal Representation:

Fish samples were collected at American River at Discovery Park on 26 July 2005 and 18 October 2005; and American River at Nimbus Dam on 27 September 2005.

Environmental Conditions:

QAPP Information:

Sampling and analyses were conducted in accordance with the Quality Assurance Project Plan, Sacramento River Watershed Program, Monitoring 2005-2007 (SRWP 2006). Fish tissue samples were collected by the California Department of Fish and Game Moss Landing Marine Lab, using protocols detailed in Sampling and Processing Trace Metal and Synthetic Organic Samples of Marine Mussels, Freshwater Clams, Marine Crabs, Marine and Freshwater Fish and Sediments: DFG Method 102 (CDFG 2001). A holding time violation was noted in the dataset for all samples included in this line of evidence. The amount of time by which the holding time was exceeded was not provided.

QAPP Information Reference(s):


DECISION ID	146215	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Pyrethroids
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)(2020)
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2027
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. 11 lines of evidence are available in the administrative record to assess pollutant. 28 of 51 water samples, reported as either dissolved or total concentrations, exceed the evaluation guideline for COLD. Six of nine sediment samples exceed the evaluation guideline for COLD. 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. 28 of 51 water samples, reported as either dissolved or total concentrations, exceed the evaluation guideline for COLD. 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.

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.

Line of Evidence (LOE) for Decision ID 146215, Pyrethroids	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

215102

Pollutant:

Pyrethroids

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 19 of 38 samples exceeded the water quality threshold for Pyrethroids.

Data Reference:

Data for Various Pollutants in American River, 2009-2010.

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:

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:

Samples were collected along the bank of the American River at Sunrise Blvd, Howe Avenue and Discovery Park. TIEs were conducted for toxic water samples collected on 02/18/09, 02/23/09, 01/19/10 and 1/22/10 at Howe Avenue. TIEs were conducted for toxic water samples collected on 02/23/09, 01/18/10 and 01/20/10 at Discovery Park.

Temporal Representation:

Environmental Conditions:

QAPP Information:

Data quality: Acceptable. Monitoring was conducted in accordance with project QAPP. Samples collected on January 16 and 18, 2010 were out of holding time. The project QAPP identified this issue before the start of the study. QA qualifiers are associated with sample results in the SWAMP database as a result of holding time violations. The QA batch qualifier code for this data set was either A (batch met project QA/QC protocols) or A, MD (batch met project QA/QC protocols; acceptable with minor deviations; batch comment required). Asbell, A. and Weston, D., 2009. Quality Assurance Project Plan for Investigation of pyrethroid pesticides in the American River. UC Berkeley, Berkeley, CA. Prepared for the CVRWQCB.

QAPP Information Reference(s):

This is a placeholder for previously assessed data that does not have quality assurance information but would require it under newly developed policies. These LOEs were previously assessed and approved at the Regional, State and Federal level in past cycles. The LOEs needed to be moved and/or reassessed but required this reference code for movement within the decision making database.

Line of Evidence (LOE) for Decision ID 146215, Pyrethroids	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

193090

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:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Pyrethroids. Although a total of 2 samples were collected, 2 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:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

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:

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 (519SAC111).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-12-16 to 2010-12-19

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 146215, Pyrethroids	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

193204

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:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Pyrethroids. Although a total of 2 samples were collected, 2 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:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

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:

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 (519LSAC53).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-12-18 to 2010-12-19

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 146215, Pyrethroids	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

193371

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:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 1 of the 1 samples exceeded the water quality threshold for Pyrethroids. Although a total of 2 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:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

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:

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 (519SAC126).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-12-18 to 2010-12-19

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 146215, Pyrethroids	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296513

Pollutant:

Pyrethroids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support and results are as follows: 2 of 2 samples exceeded the water quality threshold for Pyrethroids.

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-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:

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.Â If the freely dissolved concentrations of these pesticides were reported or could be calculated then these values were used for this assessment.Â 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: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2014-02-27

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146215, Pyrethroids	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297354

Pollutant:

Pyrethroids

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:

Evaluation Guideline:

The evaluation guideline for the protection of aquatic life from pyrethroids is one toxic unit. Individual pyrethroid concentrations in sediment were normalized to organic carbon content, divided by the respective 1/10 LC50 and then summed. A sum over over one toxic unit is an exceedance of the evaluation guideline (Amweg et al. 2006).

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:

Partitioning, bioavailability, and toxicity of the pyrethroid insecticide cypermethrin in sediments. Environmental Toxicology and Chemistry 21:9-15

Guideline Reference:

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

Guideline Reference:

Whole-sediment toxicity identification evaluation tools for pyrethroid insecticides: I. piperonyl butoxide addition. Environ. Toxicol. Chem. 26:2389-2396.

Guideline Reference:

Compilation of freshwater OC-normalized sediment toxicity data for pyrethroids

Guideline Reference:

Pyrethroid insecticides and sediment toxicity in urban creeks from California and Tennessee. Environmental Science and Technology, 40(5): 1700-1706

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-08-19 to 2019-07-18

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146215, Pyrethroids	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296554

Pollutant:

Pyrethroids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Pyrethroids.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

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:

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.Â If the freely dissolved concentrations of these pesticides were reported or could be calculated then these values were used for this assessment.Â 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: 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

The samples were collected between the dates of 2010-12-19 and 2010-12-19

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146215, Pyrethroids	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296455

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Pyrethroids. Although a total of 17 samples were collected, 17 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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-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:

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.Â If the freely dissolved concentrations of these pesticides were reported or could be calculated then these values were used for this assessment.Â 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: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-02-16 to 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146215, Pyrethroids	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296492

Pollutant:

Pyrethroids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

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:

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

Objective/Criterion Reference:

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.Â If the freely dissolved concentrations of these pesticides were reported or could be calculated then these values were used for this assessment.Â 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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2015-02-07

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146215, Pyrethroids	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296512

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:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Pyrethroids. Although a total of 2 samples were collected, 2 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:

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:

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.Â If the freely dissolved concentrations of these pesticides were reported or could be calculated then these values were used for this assessment.Â 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: 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-12-16 to 2010-12-19

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146215, Pyrethroids	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296475

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Pyrethroids. Although a total of 15 samples were collected, 15 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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-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:

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.Â If the freely dissolved concentrations of these pesticides were reported or could be calculated then these values were used for this assessment.Â 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: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-04-19 to 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.


DECISION ID	134696	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Temperature, water
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)(2020)
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2034
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. 63 lines of evidence are available in the administrative record to assess this pollutant. Of these lines of evidence 9 were based on continuous monitoring data and 50 were based on grab sample data. Continuous temperature data were used as the primary source of evidence for this assessment. A rolling 7-Day Average of Daily Maximum (7DADM) was calculated for all available data and a 7DADM is evaluated as a single sample. In the absence of natural or historical temperature data, the samples were compared against USEPA Region 10 recommended temperature requirements for each appropriate salmonid life stage present in the waterbody segment (Listing Policy Section 6.1.5.9). A total of 4,976 of 10,209 samples exceed the evaluation guideline (USEPA 2003) applied to protect the COLD freshwater habitat beneficial use. The evaluation guideline was applied during the juvenile rearing (16 degrees Celsius between March 15 - June 15) and the steelhead summer rearing (18 degrees Celsius between June 15 – September 15) life stages. A total of 993 of 12,672 samples exceed the evaluation guideline (USEPA 2003) applied to protect the migration (MIGR) freshwater habitat beneficial use. The evaluation guideline was applied during the smolt migration (20 degrees Celsius between March 15 – June 15) and adult migration (20 degrees Celsius between September 1 – December 31) salmonid life stages. A total of 3,673 of 5,060 samples exceed the evaluation guideline (USEPA 2003) applied to protect the spawning (SPAWN) freshwater habitat beneficial use. The evaluation guideline was applied during the spawning (13 degrees Celsius between October 1 – December 15) life stage. Grab sample temperature data were available for this waterbody but were not used for this assessment because they did not satisfy the spatial and temporal representation requirements of the Listing Policy (Sections 6.1.5.2 and 6.1.5.3). The data were insufficient to determine if temperature conditions experienced by aquatic life were within the optimal temperature range throughout the entire water column or the length of time temperature conditions may have exceeded the optimal temperature range. 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. 3,673 of 5,060 samples exceed the evaluation 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 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.

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297835

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 6 of 91 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 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 (Sacramento-San Joaquin River Basin Plans).

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2011-12-13 and 2020-02-04

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQX data for the 2020/2022 integrated report in Region 5.

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

206447

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Migration

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 American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (USGS-11276600)

Temporal Representation:

The samples were collected between the dates of 2014-10-07 and 2017-08-18

Environmental Conditions:

QAPP Information:

QAPP not required

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296661

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 1 of 6 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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: 519SAC110 (American River at Paradise Beach Downstream right bank).

Temporal Representation:

The samples were collected between the dates of 2019-08-20 and 2020-06-16

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

206766

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Migration

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed STORET data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 1 of 12 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (CALWR_WQX-A0718000)

Temporal Representation:

The samples were collected between the dates of 2010-10-25 and 2016-04-13

Environmental Conditions:

QAPP Information:

STORET

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

205401

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed STORET data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 1 of 12 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (CALWR_WQX-A0718000)

Temporal Representation:

The samples were collected between the dates of 2010-10-25 and 2016-04-13

Environmental Conditions:

QAPP Information:

STORET

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

213201

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519SAC111)

Temporal Representation:

The samples were collected between the dates of 2010-12-16 and 2010-12-16

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

213200

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519SAC126)

Temporal Representation:

The samples were collected between the dates of 2010-12-18 and 2010-12-18

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

206037

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

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 data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (USGS-11276600)

Temporal Representation:

The samples were collected between the dates of 2014-10-07 and 2017-08-18

Environmental Conditions:

QAPP Information:

QAPP not required

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

213712

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519SAC111)

Temporal Representation:

The samples were collected between the dates of 2010-12-16 and 2010-12-16

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59730

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:

SWAMP data indicates that 6 of 18 sample results exceed the evaluation guideline value for Water Temperature.

Data Reference:

RWB5 Safe to Swim FY0708 FY0809

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Inland Fishes of California (1976)

Spatial Representation:

Temporal Representation:

Data was collected over the time period 8/30/2007-6/30/2009.

Environmental Conditions:

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

QAPP Information:

The SWAMP QAMP (2002) was used for data before Septemper 1, 2008 and SWAMP QAPP (2008) was thereafter.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59731

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:

SWAMP data indicates that 0 of two sample results exceed the evaluation guideline value for Water Temperature.

Data Reference:

RWB5 Bacti Source ID FY0809

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Spatial Representation:

Data for this line of evidence was collected at one monitoring site [ American R @ Discovery Park - 519AMNDVY]

Temporal Representation:

Data was collected on 5/18/2009 and 5/26/2009.

Environmental Conditions:

Staff is not 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 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

206498

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (USGS-11276600)

Temporal Representation:

The samples were collected between the dates of 2014-10-07 and 2017-08-18

Environmental Conditions:

QAPP Information:

QAPP not required

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

205809

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 STORET data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 1 of 12 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (CALWR_WQX-A0718000)

Temporal Representation:

The samples were collected between the dates of 2010-10-25 and 2016-04-13

Environmental Conditions:

QAPP Information:

STORET

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

212601

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519SAC126)

Temporal Representation:

The samples were collected between the dates of 2010-12-18 and 2010-12-18

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

213246

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Migration

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519SAC126)

Temporal Representation:

The samples were collected between the dates of 2010-12-18 and 2010-12-18

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

214061

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Migration

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519SAC111)

Temporal Representation:

The samples were collected between the dates of 2010-12-16 and 2010-12-16

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230699

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 6 of 69 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519SAC106)

Temporal Representation:

The samples were collected between the dates of 2015-08-27 and 2019-02-20

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230724

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 1 of 28 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (514SAC011)

Temporal Representation:

The samples were collected between the dates of 2011-04-20 and 2013-09-26

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230322

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Spawning

Number of Samples:

111

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 15 of 111 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (514SAC009)

Temporal Representation:

The samples were collected between the dates of 2011-04-20 and 2019-02-28

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

229826

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 13 of 86 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519AMNSAC)

Temporal Representation:

The samples were collected between the dates of 2013-05-28 and 2019-02-28

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230777

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 1 of 28 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (514SAC011)

Temporal Representation:

The samples were collected between the dates of 2011-04-20 and 2013-09-26

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230460

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 6 of 69 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519SAC106)

Temporal Representation:

The samples were collected between the dates of 2015-08-27 and 2019-02-20

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230685

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 9 of 87 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519LSAC53)

Temporal Representation:

The samples were collected between the dates of 2010-12-18 and 2019-02-28

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230890

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 2 of 65 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519SAC102)

Temporal Representation:

The samples were collected between the dates of 2011-04-20 and 2019-02-28

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230769

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 1 of 38 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519SAC105)

Temporal Representation:

The samples were collected between the dates of 2015-07-16 and 2019-02-28

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230454

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 21 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (514SAC012)

Temporal Representation:

The samples were collected between the dates of 2011-04-20 and 2013-09-26

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

229829

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 3 of 75 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519LSAC52)

Temporal Representation:

The samples were collected between the dates of 2011-04-20 and 2019-02-28

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230333

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 5 of 41 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519SAC103)

Temporal Representation:

The samples were collected between the dates of 2011-04-20 and 2015-08-20

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230787

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 11 of 78 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519SAC104)

Temporal Representation:

The samples were collected between the dates of 2015-07-16 and 2019-02-28

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230414

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Migration

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 5 of 41 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519SAC103)

Temporal Representation:

The samples were collected between the dates of 2011-04-20 and 2015-08-20

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230869

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Migration

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 1 of 38 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519SAC105)

Temporal Representation:

The samples were collected between the dates of 2015-07-16 and 2019-02-28

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230872

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Migration

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 3 of 75 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519LSAC52)

Temporal Representation:

The samples were collected between the dates of 2011-04-20 and 2019-02-28

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230746

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Migration

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 6 of 69 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519SAC106)

Temporal Representation:

The samples were collected between the dates of 2015-08-27 and 2019-02-20

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230743

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Migration

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 2 of 65 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519SAC102)

Temporal Representation:

The samples were collected between the dates of 2011-04-20 and 2019-02-28

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230359

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Migration

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 21 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (514SAC012)

Temporal Representation:

The samples were collected between the dates of 2011-04-20 and 2013-09-26

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230755

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Migration

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 11 of 78 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519SAC104)

Temporal Representation:

The samples were collected between the dates of 2015-07-16 and 2019-02-28

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230871

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Migration

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 9 of 87 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519LSAC53)

Temporal Representation:

The samples were collected between the dates of 2010-12-18 and 2019-02-28

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230744

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Migration

Number of Samples:

111

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 15 of 111 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (514SAC009)

Temporal Representation:

The samples were collected between the dates of 2011-04-20 and 2019-02-28

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230870

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Migration

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 1 of 28 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (514SAC011)

Temporal Representation:

The samples were collected between the dates of 2011-04-20 and 2013-09-26

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230867

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Migration

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 13 of 86 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519AMNSAC)

Temporal Representation:

The samples were collected between the dates of 2013-05-28 and 2019-02-28

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230288

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 3 of 75 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519LSAC52)

Temporal Representation:

The samples were collected between the dates of 2011-04-20 and 2019-02-28

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230700

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 2 of 65 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519SAC102)

Temporal Representation:

The samples were collected between the dates of 2011-04-20 and 2019-02-28

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230701

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 1 of 38 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519SAC105)

Temporal Representation:

The samples were collected between the dates of 2015-07-16 and 2019-02-28

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230289

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 11 of 78 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519SAC104)

Temporal Representation:

The samples were collected between the dates of 2015-07-16 and 2019-02-28

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230754

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 21 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (514SAC012)

Temporal Representation:

The samples were collected between the dates of 2011-04-20 and 2013-09-26

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

229734

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 13 of 86 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519AMNSAC)

Temporal Representation:

The samples were collected between the dates of 2013-05-28 and 2019-02-28

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230113

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 9 of 87 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519LSAC53)

Temporal Representation:

The samples were collected between the dates of 2010-12-18 and 2019-02-28

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230291

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

111

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 15 of 111 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (514SAC009)

Temporal Representation:

The samples were collected between the dates of 2011-04-20 and 2019-02-28

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

230367

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 5 of 41 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (519SAC103)

Temporal Representation:

The samples were collected between the dates of 2011-04-20 and 2015-08-20

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

232834

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Migration

Number of Samples:

4287

Number of Exceedances:

467

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data collected hourly from 1998 through 2018 at station LAR_2 (AMERICAN R BL WATT AVE BRDG NR CARMICHAEL CA). The data was provided by staff at the USGS. Only data from the smolt migration period, March 15 through June 15, and the adult migration period, September 1 through December 31, were assessed for this metric. The 7-DADM temperatures were computed for the contiguous 7-day periods available during this time frame. The 7-day average of maximum daily temperature exceeded the evaluation guideline during 467 of the 4287 7-day periods.

Data Reference:

Continuous temperature data for three USGS stations submitted by CDFW for the 2020 assessment.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

A 7-day average of daily maximum (7-DADM) temperature of 20 degrees Celsius is recommended by the USEPA for waterbodies that are used almost exclusively for migration during the period of summer maximum temperatures to protect migrating juveniles and adults from lethal temperatures (USEPA, 2003). This evaluation guideline was applied to both the smolt (March 15 - June 15) and adult (September 1 - December 31) migration periods.

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Data collected from USGS Station LAR_2 (AMERICAN R BL WATT AVE BRDG NR CARMICHAEL CA).

Temporal Representation:

Data collected hourly from 1998 through 2018. Data from the smolt migration period, March 15 through June 15, and the adult migration period, September 1 through December 31, were assessed for this metric.

Environmental Conditions:

QAPP Information:

The data were collected by the United States Geographic Survey and are deemed by USGS to be reliable and of sound quality. Information about the monitoring equipment used is available in the reference

QAPP Information Reference(s):

Guidelines and Standard Procedures for Continuous Water-Quality Monitors: Station Operation, Record Computation, and Data Reporting by Richard J. Wagner, Robert W. Boulger, Jr., Carolyn J. Oblinger, and Brett A. Smith

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

232835

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

1538

Number of Exceedances:

1257

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data collected hourly from 1998 through 2018 at station LAR_2 (AMERICAN R BL WATT AVE BRDG NR CARMICHAEL CA). The data was provided by staff at the USGS. Only data from the salmonid spawning period, October 1 through December 15, were assessed for this metric. The 7-day moving average of maximum daily temperatures were computed for the contiguous 7-day periods available during this time frame. The 7-DADM temperature exceeded the evaluation guideline during 1257 of the 1538 7-day periods.

Data Reference:

Continuous temperature data for three USGS stations submitted by CDFW for the 2020 assessment.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

A 7-day average of daily maximum (7-DADM) temperature of 13 degrees Celsius is recommended by the USEPA for waterbodies used or potentially used for salmonid spawning, egg incubation, and fry emergence. USEPA recommends that this criterion be applied from the average date that spawning begins to the average data incubation ends (USEPA, 2003). This evaluation guideline was applied during the spawning period (October 1 - December 15).

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Data collected from USGS Station LAR_2 (AMERICAN R BL WATT AVE BRDG NR CARMICHAEL CA).

Temporal Representation:

Data collected hourly from 1998 through 2018. Data from the salmonid spawning period - October 1 through December 15 - were assessed for this metric.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

232828

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

1540

Number of Exceedances:

1279

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data collected hourly from 1998 through 2018 at station LAR_1 (AMERICAN R A FAIR OAKS CA). The data was provided by staff at the USGS. Only data from the salmonid spawning period, October 1 through December 15, were assessed for this metric. The 7-day moving average of maximum daily temperatures were computed for the contiguous 7-day periods available during this time frame. The 7-DADM temperature exceeded the evaluation guideline during 1279 of the 1540 7-day periods.

Data Reference:

Continuous temperature data for three USGS stations submitted by CDFW for the 2020 assessment.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Data collected from USGS Station LAR_1 (AMERICAN R A FAIR OAKS CA).

Temporal Representation:

Data collected hourly from 1998 through 2018. Data from the salmonid spawning period - October 1 through December 15 - were assessed for this metric.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

232845

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Spawning

Number of Samples:

1265

Number of Exceedances:

1070

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data collected hourly from 2000 through 2018 at station LAR_3 (AMERICAN R A WILLIAM B POND PARK A CARMICHAEL CA). The data was provided by staff at the USGS. Only data from the salmonid spawning period, October 1 through December 15, were assessed for this metric. The 7-day moving average of maximum daily temperatures were computed for the contiguous 7-day periods available during this time frame. The 7-DADM temperature exceeded the evaluation guideline during 1070 of the 1265 7-day periods.

Data Reference:

Continuous temperature data for three USGS stations submitted by CDFW for the 2020 assessment.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Data collected from USGS Station LAR_3 (AMERICAN R A WILLIAM B POND PARK A CARMICHAEL CA).

Temporal Representation:

Data collected hourly from 2000 through 2018. Data from the salmonid spawning period - October 1 through December 15 - were assessed for this metric.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

232841

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Migration

Number of Samples:

3470

Number of Exceedances:

352

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data collected hourly from 2000 through 2018 at station LAR_3 (AMERICAN R A WILLIAM B POND PARK A CARMICHAEL CA). The data was provided by staff at the USGS. Only data from the smolt migration period, March 15 through June 15, and the adult migration period, September 1 through December 31, were assessed for this metric. The 7-DADM temperatures were computed for the contiguous 7-day periods available during this time frame. The 7-day average of maximum daily temperature exceeded the evaluation guideline during 352 of the 3470 7-day periods.

Data Reference:

Continuous temperature data for three USGS stations submitted by CDFW for the 2020 assessment.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Data collected from USGS Station LAR_3 (AMERICAN R A WILLIAM B POND PARK A CARMICHAEL CA).

Temporal Representation:

Data collected hourly from 2000 through 2018. Data from the smolt migration period, March 15 through June 15, and the adult migration period, September 1 through December 31, were assessed for this metric.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

232827

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Fish Migration

Number of Samples:

4198

Number of Exceedances:

107

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data collected hourly from 1998 through 2018 at station LAR_1 (AMERICAN R A FAIR OAKS CA). The data was provided by staff at the USGS. Only data from the smolt migration period, March 15 through June 15, and the adult migration period, September 1 through December 31, were assessed for this metric. The 7-DADM temperatures were computed for the contiguous 7-day periods available during this time frame. The 7-day average of maximum daily temperature exceeded the evaluation guideline during 107 of the 4198 7-day periods.

Data Reference:

Continuous temperature data for three USGS stations submitted by CDFW for the 2020 assessment.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Data collected from USGS Station LAR_1 (AMERICAN R A FAIR OAKS CA).

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

232823

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

1767

Number of Exceedances:

171

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data collected hourly from 1998 through 2018 at station LAR_1 (AMERICAN R A FAIR OAKS CA). The data was provided by staff at the USGS. Only Data from the juvenile rearing period, March 15 through June 15, were assessed for this metric. The 7-day moving average of maximum daily temperatures were computed for the contiguous 7-day periods available during this time frame. The 7-DADM temperature exceeded the evaluation guideline during 171 of the 1767 7-day periods.

Data Reference:

Continuous temperature data for three USGS stations submitted by CDFW for the 2020 assessment.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

A 7-day average of daily maximum (7-DADM) temperature of 16 degrees Celsius is recommended by the USEPA for waterbodies that are used for high density summertime salmonid juvenile rearing to protect juvenile salmonids from lethal temperatures and to provide upper optimal conditions for juvenile growth under limited food during the period of summer maximum temperatures and optimal temperatures for other times of the growth season (USEPA, 2003). This evaluation guideline was applied during the juvenile rearing period (March 15 - June 15)

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Data collected from USGS Station LAR_1 (AMERICAN R A FAIR OAKS CA).

Temporal Representation:

Data collected hourly from 1998 through 2018. Data from the juvenile rearing period - March 15 through June 15 - were assessed for this metric.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

232846

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

1471

Number of Exceedances:

1216

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data collected hourly from 2000 through 2018 at station LAR_3 (AMERICAN R A WILLIAM B POND PARK A CARMICHAEL CA). The data was provided by staff at the USGS. Only data from the steelhead summer rearing period, June 15 through September 15, were assessed for this metric. The 7-day moving average of maximum daily temperatures were computed for the contiguous 7-day periods available during this time frame. The 7-DADM temperature exceeded the evaluation guideline during 1216 of the 1471 7-day periods.

Data Reference:

Continuous temperature data for three USGS stations submitted by CDFW for the 2020 assessment.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

A 7-day average of daily maximum (7-DADM) temperature of 18 degrees Celsius is recommended by the USEPA for waterbodies that are used primarily for migrating adult and juvenile salmonids and moderate to low density (Non-Core) salmonid juvenile rearing during the period of summer maximum temperatures. The USEPA guidance recognizes that waterbodies meeting the 18 degrees 7-DADM criterion would also provide optimal or near optimal juvenile growth conditions (under limited food conditions) for much of the summer (USEPA, 2003). This evaluation guideline was applied during the steelhead summer rearing period (June 15 and September 15).

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Data collected from USGS Station LAR_3 (AMERICAN R A WILLIAM B POND PARK A CARMICHAEL CA).

Temporal Representation:

Data collected hourly from 2000 through 2018. Data from the steelhead summer rearing period - June 15 through September 15 - were assessed for this metric.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

232829

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

1795

Number of Exceedances:

656

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data collected hourly from 1998 through 2018 at station LAR_1 (AMERICAN R A FAIR OAKS CA). The data was provided by staff at the USGS. Only data from the steelhead summer rearing period, June 15 through September 15, were assessed for this metric. The 7-day moving average of maximum daily temperatures were computed for the contiguous 7-day periods available during this time frame. The 7-DADM temperature exceeded the evaluation guideline during 656 of the 1795 7-day periods.

Data Reference:

Continuous temperature data for three USGS stations submitted by CDFW for the 2020 assessment.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Data collected from USGS Station LAR_1 (AMERICAN R A FAIR OAKS CA).

Temporal Representation:

Data collected hourly from 1998 through 2018. Data from the steelhead summer rearing period - June 15 through September 15 - were assessed for this metric.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

232833

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

1846

Number of Exceedances:

691

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data collected hourly from 1998 through 2018 at station LAR_2 (AMERICAN R BL WATT AVE BRDG NR CARMICHAEL CA). The data was provided by staff at the USGS. Only Data from the juvenile rearing period, March 15 through June 15, were assessed for this metric. The 7-day moving average of maximum daily temperatures were computed for the contiguous 7-day periods available during this time frame. The 7-DADM temperature exceeded the evaluation guideline during 691 of the 1846 7-day periods.

Data Reference:

Continuous temperature data for three USGS stations submitted by CDFW for the 2020 assessment.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Data collected from USGS Station LAR_2 (AMERICAN R BL WATT AVE BRDG NR CARMICHAEL CA).

Temporal Representation:

Data collected hourly from 1998 through 2018. Data from the juvenile rearing period - March 15 through June 15 - were assessed for this metric.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

232839

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

1850

Number of Exceedances:

1733

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data collected hourly from 1998 through 2018 at station LAR_2 (AMERICAN R BL WATT AVE BRDG NR CARMICHAEL CA). The data was provided by staff at the USGS. Only data from the steelhead summer rearing period, June 15 through September 15, were assessed for this metric. The 7-day moving average of maximum daily temperatures were computed for the contiguous 7-day periods available during this time frame. The 7-DADM temperature exceeded the evaluation guideline during 1733 of the 1850 7-day periods.

Data Reference:

Continuous temperature data for three USGS stations submitted by CDFW for the 2020 assessment.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Data collected from USGS Station LAR_2 (AMERICAN R BL WATT AVE BRDG NR CARMICHAEL CA).

Temporal Representation:

Data collected hourly from 1998 through 2018. Data from the steelhead summer rearing period - June 15 through September 15 - were assessed for this metric.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

232840

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

1480

Number of Exceedances:

509

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data collected hourly from 2000 through 2018 at station LAR_3 (AMERICAN R A WILLIAM B POND PARK A CARMICHAEL CA). The data was provided by staff at the USGS. Only Data from the juvenile rearing period, March 15 through June 15, were assessed for this metric. The 7-day moving average of maximum daily temperatures were computed for the contiguous 7-day periods available during this time frame. The 7-DADM temperature exceeded the evaluation guideline during 509 of the 1480 7-day periods.

Data Reference:

Continuous temperature data for three USGS stations submitted by CDFW for the 2020 assessment.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Data collected from USGS Station LAR_3 (AMERICAN R A WILLIAM B POND PARK A CARMICHAEL CA).

Temporal Representation:

Data collected hourly from 2000 through 2018. Data from the juvenile rearing period - March 15 through June 15 - were assessed for this metric.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

243069

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 STORET data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 8 of 71 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (CALWR_WQX-A0714010)

Temporal Representation:

The samples were collected between the dates of 2010-09-08 and 2016-04-13

Environmental Conditions:

QAPP Information:

STORET

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

243344

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed STORET data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 8 of 71 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (CALWR_WQX-A0714010)

Temporal Representation:

The samples were collected between the dates of 2010-09-08 and 2016-04-13

Environmental Conditions:

QAPP Information:

STORET

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

243388

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Migration

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed STORET data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 8 of 71 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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 (CALWR_WQX-A0714010)

Temporal Representation:

The samples were collected between the dates of 2010-09-08 and 2016-04-13

Environmental Conditions:

QAPP Information:

STORET

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296802

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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: 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

The samples were collected between the dates of 2013-08-22 and 2020-08-19

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296801

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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: 519SAC112 (American River Upstream of Business 80 left bank).

Temporal Representation:

The samples were collected between the dates of 2019-08-20 and 2020-06-16

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296670

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296723

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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: 519SAC107 (American River at Paradise Beach Upstream midstream).

Temporal Representation:

The samples were collected between the dates of 2019-08-20 and 2019-09-03

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297886

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 752668 (R-011).

Temporal Representation:

The samples were collected between the dates of 2011-10-18 and 2011-11-01

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297863

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 752664 (R-007).

Temporal Representation:

The samples were collected between the dates of 2011-05-09 and 2011-11-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297861

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 752661 (R-004).

Temporal Representation:

The samples were collected between the dates of 2011-05-09 and 2011-11-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297859

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 4 of 98 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2011-12-05 and 2020-10-06

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296505

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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: 519LSAC53 (American R at Howe Ave Access).

Temporal Representation:

The samples were collected between the dates of 2019-03-12 and 2020-08-26

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297807

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 5 of 99 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2011-12-05 and 2020-10-06

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297910

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 55 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2011-12-05 and 2020-10-06

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296484

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 1 of 6 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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: 519SAC119 (American River at Sutters Landing Regional Park right bank).

Temporal Representation:

The samples were collected between the dates of 2019-08-20 and 2020-06-16

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297810

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 55 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2011-12-05 and 2020-10-06

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297808

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 4 of 98 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2011-12-05 and 2020-10-06

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297030

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 1 of 6 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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: 519SAC109 (American River at Paradise Beach Downstream left bank).

Temporal Representation:

The samples were collected between the dates of 2019-08-20 and 2020-06-16

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296729

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 1 of 35 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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: 519AMNSAC (American-Sacramento Confluence Beach).

Temporal Representation:

The samples were collected between the dates of 2019-03-12 and 2020-08-26

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296620

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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: 514SAC009 (American River at North 10th Street).

Temporal Representation:

The samples were collected between the dates of 2019-03-12 and 2020-08-26

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297809

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 4 of 47 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2011-12-13 and 2020-02-04

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296550

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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: 519SAC128 (American River at Rossmoor Bar).

Temporal Representation:

The samples were collected between the dates of 2019-09-03 and 2019-09-03

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

292436

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater 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 American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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: USGS-383609121293200 (AMERICAN R 1 MI AB MOUTH CA).

Temporal Representation:

The samples were collected between the dates of 2016-05-11 and 2016-10-26

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296688

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

137

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 8 of 137 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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: 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2020-08-26

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296448

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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: 519SAC104 (American River at Sutter's Landing Regional Park).

Temporal Representation:

The samples were collected between the dates of 2019-03-12 and 2020-06-16

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297885

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 757604 (R-003).

Temporal Representation:

The samples were collected between the dates of 2011-05-09 and 2011-11-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297834

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 752659 (R-002).

Temporal Representation:

The samples were collected between the dates of 2011-05-11 and 2011-11-15

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297884

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

103

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 103 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2011-12-07 and 2020-10-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297909

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 752658 (R-001).

Temporal Representation:

The samples were collected between the dates of 2011-05-11 and 2011-11-15

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296609

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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: 519SAC108 (American River at Paradise Beach Upstream right bank).

Temporal Representation:

The samples were collected between the dates of 2019-08-20 and 2020-08-26

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296565

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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: 519SAC106 (American River at Camp Pollock).

Temporal Representation:

The samples were collected between the dates of 2019-03-12 and 2020-07-29

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296673

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 1 of 6 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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: 519SAC113 (American River Downstream of Business 80 right bank).

Temporal Representation:

The samples were collected between the dates of 2019-08-20 and 2020-06-16

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296590

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296689

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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: 519SAC102 (American River at River Bend Park).

Temporal Representation:

The samples were collected between the dates of 2019-03-12 and 2020-08-26

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296987

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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: 519LSAC52 (American R at Lower Sunrise Area).

Temporal Representation:

The samples were collected between the dates of 2019-03-12 and 2020-08-26

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296466

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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: 519SAC105 (American River near Glenn Hall Park).

Temporal Representation:

The samples were collected between the dates of 2019-03-12 and 2020-08-26

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297860

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 752663 (R-006).

Temporal Representation:

The samples were collected between the dates of 2011-05-09 and 2011-11-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297862

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 752662 (R-005).

Temporal Representation:

The samples were collected between the dates of 2011-05-09 and 2011-11-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296525

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

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: 519SAC118 (American River at Sutters Landing Regional Park midstream).

Temporal Representation:

The samples were collected between the dates of 2019-08-20 and 2019-10-01

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297883

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 56 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2011-12-07 and 2020-10-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134696, Temperature, water	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297887

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

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:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 752667 (R-010).

Temporal Representation:

The samples were collected between the dates of 2011-10-18 and 2011-11-01

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

Data for Various Pollutants in American River, 2009-2010.


DECISION ID	146207	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Toxicity
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)(2020)
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2021
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the section 303(d) list under section 4.1 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 toxicity. Twelve water samples tested with Ceriodaphnia dubia, eight water samples tested with Pimephales promelas exceeded the water quality survival or growth objectives, and twenty-one samples tested with Hyalella azteca exceeded the water quality survival or growth objectives. 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. Twelve of 130 water samples tested with Ceriodaphnia dubia (an invertebrate species) exhibited a statistically significant reduction in survival (one of 65) or reproduction (11 of 65) and twenty-one of 47 water samples tested with Hyalella azteca exceeded the narrative toxicity objective, and this exceeds the allowable frequency listed in Table 4.1 of the Listing Policy. 4. Eight of 34 water samples tested with Pimephales promelas (Fathead Minnow, a vertebrate species) exhibited a statistically significant reduction in survival (three of 34) and/or growth (five of 34) and exceeded the narrative toxicity objective, and this exceeds the allowable frequency listed in Table 4.1 of the Listing Policy. As both survival and growth toxicity, to fathead minnow, were reported for the sample collected on 18 August 1998, this was treated as a single toxic event for the purposes of determining the number of exceedances of the narrative toxicity objective. 5. Zero of 23 samples tested with Selenastrum capricornutum (an algal species) exhibited a statistically significant reduction in growth compared to control and, therefore, none of the samples exceeded the narrative toxicity objective, and this does not exceed the allowable frequency listed in Table 4.1 of the Listing Policy. 6. 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.

Line of Evidence (LOE) for Decision ID 146207, Toxicity	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59743

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:

Thirty nine water samples were tested for toxicity to Hyalella azteca. Twenty of the thirty nine samples exhibited statistically significant effect relative to control. The toxicity tests included percent mortality and percent dead or impaired swimming.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. Region 5 Basin Plan.

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

Evaluation Guideline:

Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing (parametric Dunnett's Test or non-parametric Kruskal-Wallis or Wilcoxon Two-sample Test). The t-test is used to determine if there is a statistically significant decrease in organism response in the sample as compared to the control.

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

Guideline Reference:

Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms, Fifth Edition. EPA-821-R-02-012

Spatial Representation:

The samples were collected at Sunrise Blvd, Howe Avenue, and Discovery Park.

Temporal Representation:

The samples were collected from February 2009 through April 2010.

Environmental Conditions:

QAPP Information:

No QAPP no monitoring protocol

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 146207, Toxicity	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59744

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:

One sample was collected to evaluate sediment toxicity. The sample did not exhibit significant toxicity. The toxicity test included survival and growth of Hyalella azteca.

Data Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

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. Region 5 Basin Plan.

Objective/Criterion Reference:

Evaluation Guideline:

Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing. For SWAMP data exceedances are counted with the significant effect code SL. SL is defined as the result being significant compared to the negative control based on a statistical test, less than stated the alpha level, AND less than the evaluation threshold.

Guideline Reference:

Spatial Representation:

The sample was collected at station 519AMNDVY.

Temporal Representation:

The sample was collected in July 2008.

Environmental Conditions:

QAPP Information:

All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 146207, Toxicity	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

21571

Pollutant:

Plant Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

Four-day growth tests were conducted with Selenastrum capricornutum in association with Sacramento River Watershed Program annual monitoring activities. Zero of the 23 samples exhibited a significant decrease in growth as compared to the laboratory control (none violated the narrative toxicity objective). The following is a summary of monitoring results by year. In 1999 to 2000, one sample, collected on 21 September 1999, did not exhibit a significant decrease in growth (cell numbers) as compared to the laboratory control. In 2003 to 2004, none of 4 samples exhibited a significant decrease in growth (cell numbers) as compared to the laboratory control. In 2006 to 2007, none of 18 samples exhibited a significant decrease in growth as compared to the laboratory control. The results reported for the sample collected on 25 July 2006 were those of a re-test (SRWP 2008).

Data Reference:

Final Proposition 50 Grant Monitoring Report, 2005 - 2007. Includes Quality Assurance Project Plan (QAPP) Revision 1.2.0, Appendix A, March 2006

Sacramento River Watershed Program Annual Reports for 1999-2000, 2000-2001, 2001-2002, 2002-2003, and 2003-2004; and BDAT data 1998-2003

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances (CVRWQCB, 2007).

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

Evaluation Guideline:

Statistically significant difference from control with a short-term chronic (4-day) growth test.

Guideline Reference:

Spatial Representation:

Samples were collected from the American River at Discovery Park.

Temporal Representation:

In 1999 to 2000, a single sample was collected on 21 September 1999. In 2003 to 2004, sampling was scheduled to correspond to the following events/dates: mid-wet season (22 January 2004); post-organophosphate pesticide dormant spray application (5 February 2004); rice field discharge season, dry weather event (10 June 2004); and dry season, low flows (29 July 2004). In 2006 to 2007, sampling was generally conducted on a monthly basis from April 2006 through August 2007.

Environmental Conditions:

QAPP Information:

Data quality: Good. Monitoring was conducted in accordance with the Quality Assurance Project Plan for Monitoring prepared for the Sacramento River Watershed Program (SRWP 1999a, 1999b, 2000b, 2001b, 2002b, 2003b, 2006).

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 146207, Toxicity	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

21573

Pollutant:

Invertebrate Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

Seven-day reproduction toxicity tests were conducted with Ceriodaphnia dubia. Eleven of the 65 samples exhibited significant reduction in reproduction compared to the laboratory control and violated the narrative toxicity objective. The following is a summary of (Reproduction Endpoint) toxicity test results, by year. In 1998 to 1999, one of 12 samples exhibited significant reduction in reproduction compared to the laboratory control. The toxic sample was collected on 21 July 1998 (49% of control). In1999 to 2000, one of 12 samples exhibited significant reduction in reproduction compared to the laboratory control. The toxic sample was collected 16 February 2000 (75% of control). In 2000 to 2001, two of 9 samples exhibited significant reduction in reproduction compared to the laboratory control. Toxic samples were collected on the following dates: 19 September 2000 and 31 October 2000. The data summary does not provide the corresponding data for the control associated with each test but, rather, provides the range of data for separate controls associated with multiple tests. Therefore, percent of control was not calculated. In 2001 to 2002, two of 5 samples exhibited significant reduction in reproduction compared to the laboratory control. The toxic samples were collected on 26 September 2001 and 16 May 2002. Percent of control was not included for same reason as for the 2000-2001 monitoring summary. In 2002 to 2003, zero of 5 samples exhibited significant reduction in reproduction compared to the laboratory control. In 2003 to 2004, four of 4 samples exhibited significant reduction in reproduction compared to the laboratory control. The toxic samples were collected on the following dates: 22 January 2004, 5 February 2004, 10 June 2004, and 29 July 2004. Percent of control was not included for same reason as for the 2000 to 2001 monitoring summary. In 2006 to 2007, one of 18 samples exhibited significant reduction in reproduction compared to the laboratory control. The toxic sample was collected on 9 February 2007 and had 85% response relative to the control.

Data Reference:

Final Proposition 50 Grant Monitoring Report, 2005 - 2007. Includes Quality Assurance Project Plan (QAPP) Revision 1.2.0, Appendix A, March 2006

Sacramento River Watershed Program Annual Reports for 1999-2000, 2000-2001, 2001-2002, 2002-2003, and 2003-2004; and BDAT data 1998-2003

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

Evaluation Guideline:

Statistically significant difference from control with 7-day reproduction toxicity tests. Significant toxicity is defined as decreased reproduction that is statistically different from controls at the 95% confidence level.

Guideline Reference:

Short-Term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Freshwater Organisms. EPA/600/4-91/002. Third Edition. July 1994

Guideline Reference:

Spatial Representation:

Samples were collected from the American River at Discovery Park.

Temporal Representation:

In 1998 to 1999, samples were collected monthly from June 1998 through May 1999. In 1999 to 2000, samples were collected monthly from June 1999 through May 2000 (12 sampling events). In 2000 to 2001, samples were collected on 19 July 2000, 19 September 2000, 17 October 2000, 31 October 2000, 27 January 2001, 8 February 2001, 9 April 2001, 30 May 2001, and 21 June 2001. In 2001 to 2002, sampling was scheduled to correspond to the following events/dates: late dry season, low flows (26 September 2001); seasonal (first flush) storm (5 November 2001); significant rainfall of >0.5 inches, organophosphate pesticide application period (23 February 2002); significant rainfall of >0.5 inches within 24 hours (8 March 2002); and rice field discharge period, late wet season (16 May 2002). In 2002-2003, sampling was scheduled to correspond to the following events/dates: late dry season, low flows (3 October 2002); first significant storm event of season (11 November 2002); late wet season, rain events (17 March 2003 and 14 April 2003); and rice field discharge season, dry weather event (10 June 2003). In 2003 to 2004, sampling was scheduled to correspond to the following events/dates: mid-wet season (22 January 2004); post-organophosphate pesticide dormant spray application (5 February 2004); rice field discharge season, dry weather event (10 June 2004); and dry season, low flows (29 July 2004). In 2006 to 2007, sampling was generally conducted monthly from April 2006 through August 2007.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 146207, Toxicity	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

21572

Pollutant:

Invertebrate Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

Seven-day survival toxicity tests were conducted with Ceriodaphnia dubia. One of the 65 samples exhibited a significant increase in mortality compared to the laboratory control and violated the narrative toxicity objective. The following is a summary of (Survival Endpoint) toxicity test results, by year. 1998-1999-Zero of 12 samples exhibited a significant increase in mortality compared to the laboratory control. 1999-2000-Zero of 12 samples exhibited a significant increase in mortality compared to the laboratory control. 2000-2001-Zero of 9 samples exhibited a significant increase in mortality compared to the laboratory control. 2001-2002-Zero of 5 samples exhibited a significant increase in mortality compared to the laboratory control. 2002-2003-Zero of 5 samples exhibited a significant increase in mortality compared to the laboratory control. 2003-2004-Zero of 4 samples exhibited a significant increase in mortality compared to the laboratory control. 2006-2007-One of 18 samples exhibited a significant increase in mortality compared to the laboratory control. The toxic sample was collected on 12 December 2006 (0% of control response). It should be noted that, of the 12 water samples collected from across the watershed during this sampling event (December 2006), 11 caused complete mortality of the test organisms in the initial test. Phase I Toxicity Identification Evaluations (TIEs) were conducted using the 12 December 2006 sample. Although persistent during the TIEs, the toxicity was delayed and its magnitude was decreased. Toxicity was removed by the following TIE treatments: C-8 Solid Phase Extraction and piperonyl butoxide (PBO). This suggests that dissolved non-polar organic contaminants and metabolically-activated substances, or a substance with both properties, caused the toxicity (SRWP 2008).

Data Reference:

Final Proposition 50 Grant Monitoring Report, 2005 - 2007. Includes Quality Assurance Project Plan (QAPP) Revision 1.2.0, Appendix A, March 2006

Sacramento River Watershed Program Annual Reports for 1999-2000, 2000-2001, 2001-2002, 2002-2003, and 2003-2004; and BDAT data 1998-2003

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

Evaluation Guideline:

Statistically significant difference from control with 7-day survival toxicity tests. Significant toxicity is defined as mortality (=20%) that is statistically different from controls at the 95% confidence level.

Guideline Reference:

Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms, Fifth Edition. U.S. Environmental Protection Agency Office of Water, Washington, DC EPA-821-R-02-012

Spatial Representation:

Samples were collected from the American River at Discovery Park.

Temporal Representation:

In 1998 to1999, samples were collected monthly from June 1998 through May 1999. In 1999 to 2000, samples were collected monthly from June 1999 through May 2000 (12 sampling events). In 2000 to 2001, samples were collected on 19 July 2000, 19 September 2000, 17 October 2000, 31 October 2000, 27 January 2001, 8 February 2001, 9 April 2001, 30 May 2001, and 21 June 2001. In 2001 to 2002, sampling was scheduled to correspond to the following events/dates: late dry season, low flows (26 September 2001); seasonal (first flush) storm (5 November 2001); significant rainfall of >0.5 inches, organophosphate pesticide application period (23 February 2002); significant rainfall of >0.5 inches within 24 hours (8 March 2002); and rice field discharge period, late wet season (16 May 2002). In 2002 to 2003, sampling was scheduled to correspond to the following events/dates: late dry season, low flows (3 October 2002); first significant storm event of season (11 November 2002); late wet season, rain events (17 March 2003 and 14 April 2003); and rice field discharge season, dry weather event (10 June 2003). In 2003 to 2004, sampling was scheduled to correspond to the following events/dates: mid-wet season (22 January 2004); post-organophosphate pesticide dormant spray application (5 February 2004); rice field discharge season, dry weather event (10 June 2004); and dry season, low flows (29 July 2004). In 2006 to 2007, sampling was generally conducted on a monthly basis from April 2006 through August 2007.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 146207, Toxicity	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

195771

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:

0 of the 2 samples collected by SWAMP RWB5 Monitoring for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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, at the same location with the same lab sample ID (if provided). The following organisms and parameters were utilized for the toxicity tests: Hyalella azteca, for Swim Normally, Hyalella azteca, for Survival

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. Region 5 Basin Plan.

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

Evaluation Guideline:

Guideline Reference:

Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms, Fifth Edition. EPA-821-R-02-012

Guideline Reference:

Spatial Representation:

The samples were collected at 1 station. Monitoring site: ( 519LSAC53 )

Temporal Representation:

The samples were collected between the dates of 2010-12-18 and 2010-12-19.

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 146207, Toxicity	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

4284

Pollutant:

Unknown Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

Placeholder reference pre-2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Placeholder reference pre-2006 303(d)

Spatial Representation:

Unspecified

Temporal Representation:

Unspecified

Environmental Conditions:

Unspecified

QAPP Information:

Unspecified

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 146207, Toxicity	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

25812

Pollutant:

Vertebrate Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

Seven-day survival toxicity tests were conducted with Pimephales promelas. Three of the 34 samples exhibited a significant increase in mortality compared to the laboratory control and violated the narrative toxicity objective. The following is a summary of the survival endpoint acute toxicity test results, by year.
1998-1999: One of the 12 samples exhibited a significant increase in mortality compared to the laboratory controls. The toxic sample was collected on 18 August 1998 (7.5% mortality). 2003-2004: None of the four samples exhibited a significant increase in mortality compared to the laboratory controls. The results reported for the 22 January 2004 and 5 February 2004 are those from tests modified to control pathogen-related mortality. The initial test of the sample collected on 10 June 2004 was not toxic; however, the controls did not meet test acceptability requirements (SRWP 2005). The results provided in the report (SRWP 2005) are those of the initial test. 2006-2007: Two of the 18 samples exhibited a significant increase in mortality compared to the laboratory controls. The toxic samples were collected on the following dates (survival reported as a percentage of control response is provided in parentheses): 14 March 2007 (75) and 25 April 2007 (75).

Data Reference:

Final Proposition 50 Grant Monitoring Report, 2005 - 2007. Includes Quality Assurance Project Plan (QAPP) Revision 1.2.0, Appendix A, March 2006

Sacramento River Watershed Program Annual Reports for 1999-2000, 2000-2001, 2001-2002, 2002-2003, and 2003-2004; and BDAT data 1998-2003

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

Evaluation Guideline:

Statistically significant difference from control with 7-day survival toxicity tests. Significant toxicity is defined as a statistically significant (p<0.5) increase in mortality (>=20%) compared to the laboratory control.

Guideline Reference:

Spatial Representation:

Samples were collected from the lower American River, at Discovery Park.

Temporal Representation:

1998-1999 Monitoring ¿ Samples collected monthly from June 1998 through May 1999. 2003-2004 Monitoring ¿ Sampling was scheduled to correspond to the following events/dates: mid-wet season (22 January 2004); post-organophosphate pesticide dormant spray application (5 February 2004); rice field discharge season, dry weather event (10 June 2004); and dry season, low flows (29 July 2004). 2006-2007 Monitoring ¿ Sampling was generally conducted on a monthly basis from April 2006 through August 2007.

Environmental Conditions:

QAPP Information:

Data Quality: Good. Monitoring was conducted in accordance with the Quality Assurance Project Plan for Monitoring prepared for the Sacramento River Watershed Program (SRWP 1999a, 1999b, 2003, 2006). The controls for tests conducted on the sample collected on 10 June 2004 did not meet test acceptability requirements (SRWP 2005). The results reported in the report (SRWP 2005) are those of the initial test.

QAPP Information Reference(s):

Final Proposition 50 Grant Monitoring Report, 2005 - 2007. Includes Quality Assurance Project Plan (QAPP) Revision 1.2.0, Appendix A, March 2006

QAPP Information Reference(s):

Quality Assurance Project Plans prepared for Sacramento River Watershed Program

Line of Evidence (LOE) for Decision ID 146207, Toxicity	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

25912

Pollutant:

Vertebrate Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

Seven-day growth toxicity tests were conducted with Pimephales promelas. Five of the 34 samples exhibited a significant reduction in growth compared to the laboratory control and violated the narrative toxicity objective. Growth endpoints for P. promelas were not statistically compared to control results if survival endpoints were significantly less than the controls, except during the 1998-1999 monitoring period. The following is a summary of the growth endpoint toxicity test results, by year.
1998-1999: Two of the 12 samples exhibited a significant reduction in growth compared to the laboratory controls. The toxic samples were collected on 18 August 1998 (60% of controls) and 17 February 1999 (65% of controls). 2003-2004: None of the four samples exhibited a significant reduction in growth compared to the laboratory controls. The results reported for the 22 January 2004 and 5 February 2004 are those from tests modified to control pathogen-related mortality. The initial test of the sample collected on 10 June 2004 was not toxic; however, the controls did not meet test acceptability requirements (SRWP 2005). The results provided in the report (SRWP 2005) are those of the initial test. 2006-2007: Three of the 18 samples exhibited a significant reduction in growth compared to the laboratory controls. The toxic samples were collected on the following dates: 30 May 2006 (86% of control); 25 October 2006 (68% of control) and 27 June 2007 (84% of control).

Data Reference:

Final Proposition 50 Grant Monitoring Report, 2005 - 2007. Includes Quality Assurance Project Plan (QAPP) Revision 1.2.0, Appendix A, March 2006

Sacramento River Watershed Program Annual Reports for 1999-2000, 2000-2001, 2001-2002, 2002-2003, and 2003-2004; and BDAT data 1998-2003

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

Evaluation Guideline:

Statistically significant difference from control with 7-day growth toxicity tests. Significant toxicity is defined as a statistically significant (p<0.5) reduction in growth compared to the laboratory control.

Guideline Reference:

Spatial Representation:

Samples were collected from the lower American River, at Discovery Park.

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Final Proposition 50 Grant Monitoring Report, 2005 - 2007. Includes Quality Assurance Project Plan (QAPP) Revision 1.2.0, Appendix A, March 2006

QAPP Information Reference(s):

Quality Assurance Project Plans prepared for Sacramento River Watershed Program

Line of Evidence (LOE) for Decision ID 146207, Toxicity	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297135

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:

0 of the 10 samples collected by SWAMP Stream Pollution Trends for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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 Growth (wt/surv indiv), Chironomus dilutus for Survival, Hyalella azteca for Survival, Chironomus dilutus for Growth (wt/surv indiv).

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. Region 5 Basin Plan.

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

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.Â An exceedance is counted when the significant effect code is â€œSignificant; Less Similarity,â€ which means that the sample result is significantly different than the control result, and the percent effect is greater than the evaluation threshold.Â The default evaluation threshold is 20% unless otherwise stated.

Guideline Reference:

Spatial Representation:

The samples were collected at monitoring site: 519AMNDVY ( American R @ Discovery Park ).

Temporal Representation:

The samples were collected between the dates of 2011-08-19 and 2020-08-19.

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146207, Toxicity	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

195770

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:

0 of the 3 samples collected by SWAMP RWB5 Monitoring for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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, at the same location with the same lab sample ID (if provided). The following organisms and parameters were utilized for the toxicity tests: Hyalella azteca, for Swim Normally, Hyalella azteca, for Survival

Data Reference:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. Region 5 Basin Plan.

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

Evaluation Guideline:

Guideline Reference:

Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms, Fifth Edition. EPA-821-R-02-012

Guideline Reference:

Spatial Representation:

The samples were collected at 1 station. Monitoring site: ( 519SAC111 )

Temporal Representation:

The samples were collected between the dates of 2010-12-16 and 2010-12-19.

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 146207, Toxicity	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297073

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:

1 of the 3 samples collected by SWAMP RWB5 Monitoring for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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 Swim Normally. The following tests exhibited toxicity: Hyalella azteca for Swim Normally on 2010-12-19.

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. Region 5 Basin Plan.

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at monitoring site: 519AMNDVY ( American R @ Discovery Park ).

Temporal Representation:

The samples were collected between the dates of 2010-12-16 and 2010-12-19.

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.


DECISION ID	146223	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	1, 1, 2-trichloro-1, 2, 2-trifluoroethane
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. 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:

Line of Evidence (LOE) for Decision ID 146223, 1, 1, 2-trichloro-1, 2, 2-trifluoroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296940

Pollutant:

1, 1, 2-trichloro-1, 2, 2-trifluoroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Trichloro-1,2,2-trifluoroethane, 1,1,2-.

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 1, 2-Trichloro-1, 2, 2-trifluoroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 1.2 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146223, 1, 1, 2-trichloro-1, 2, 2-trifluoroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297732

Pollutant:

1, 1, 2-trichloro-1, 2, 2-trifluoroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Trichloro-1,2,2-trifluoroethane, 1,1,2-.

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: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146223, 1, 1, 2-trichloro-1, 2, 2-trifluoroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297948

Pollutant:

1, 1, 2-trichloro-1, 2, 2-trifluoroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Trichloro-1,2,2-trifluoroethane, 1,1,2-.

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: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146223, 1, 1, 2-trichloro-1, 2, 2-trifluoroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297947

Pollutant:

1, 1, 2-trichloro-1, 2, 2-trifluoroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Trichloro-1,2,2-trifluoroethane, 1,1,2-.

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: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146223, 1, 1, 2-trichloro-1, 2, 2-trifluoroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297735

Pollutant:

1, 1, 2-trichloro-1, 2, 2-trifluoroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Trichloro-1,2,2-trifluoroethane, 1,1,2-.

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: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146223, 1, 1, 2-trichloro-1, 2, 2-trifluoroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297869

Pollutant:

1, 1, 2-trichloro-1, 2, 2-trifluoroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Trichloro-1,2,2-trifluoroethane, 1,1,2-.

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: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146223, 1, 1, 2-trichloro-1, 2, 2-trifluoroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297944

Pollutant:

1, 1, 2-trichloro-1, 2, 2-trifluoroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Trichloro-1,2,2-trifluoroethane, 1,1,2-.

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: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146223, 1, 1, 2-trichloro-1, 2, 2-trifluoroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297945

Pollutant:

1, 1, 2-trichloro-1, 2, 2-trifluoroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Trichloro-1,2,2-trifluoroethane, 1,1,2-.

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: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146223, 1, 1, 2-trichloro-1, 2, 2-trifluoroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297949

Pollutant:

1, 1, 2-trichloro-1, 2, 2-trifluoroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality threshold for Trichloro-1,2,2-trifluoroethane, 1,1,2-.

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: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146223, 1, 1, 2-trichloro-1, 2, 2-trifluoroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297733

Pollutant:

1, 1, 2-trichloro-1, 2, 2-trifluoroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Trichloro-1,2,2-trifluoroethane, 1,1,2-.

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: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146223, 1, 1, 2-trichloro-1, 2, 2-trifluoroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296939

Pollutant:

1, 1, 2-trichloro-1, 2, 2-trifluoroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146224	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	1, 1-dichloroethane
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. 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:

Line of Evidence (LOE) for Decision ID 146224, 1, 1-dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297657

Pollutant:

1, 1-dichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloroethane, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 1-Dichloroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146224, 1, 1-dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297629

Pollutant:

1, 1-dichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloroethane, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 1-Dichloroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146224, 1, 1-dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293955

Pollutant:

1, 1-dichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 Primary Maximum Contaminant Level for 1, 1-Dichloroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146224, 1, 1-dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297630

Pollutant:

1, 1-dichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloroethane, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 1-Dichloroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146224, 1, 1-dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297655

Pollutant:

1, 1-dichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloroethane, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 1-Dichloroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146224, 1, 1-dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297631

Pollutant:

1, 1-dichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloroethane, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 1-Dichloroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146224, 1, 1-dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297627

Pollutant:

1, 1-dichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Dichloroethane, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 1-Dichloroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146224, 1, 1-dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297628

Pollutant:

1, 1-dichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloroethane, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 1-Dichloroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146224, 1, 1-dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293953

Pollutant:

1, 1-dichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 Primary Maximum Contaminant Level for 1, 1-Dichloroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146224, 1, 1-dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297660

Pollutant:

1, 1-dichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloroethane, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 1-Dichloroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146224, 1, 1-dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297632

Pollutant:

1, 1-dichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Dichloroethane, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 1-Dichloroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146225	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	1, 3 -dichlorobenzene
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. 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:

Line of Evidence (LOE) for Decision ID 146225, 1, 3 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297520

Pollutant:

1, 3 -dichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichlorobenzene, 1,3-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 3-dichlorobenzene criterion for the protection of human health from consumption of organisms only is 2,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146225, 1, 3 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294242

Pollutant:

1, 3 -dichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Dichlorobenzene, 1,3-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 3-dichlorobenzene criterion for the protection of human health from the consumption of water and organisms is 400 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-24

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146225, 1, 3 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297536

Pollutant:

1, 3 -dichlorobenzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichlorobenzene, 1,3-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 3-dichlorobenzene criterion for the protection of human health from the consumption of water and organisms is 400 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146225, 1, 3 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297529

Pollutant:

1, 3 -dichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichlorobenzene, 1,3-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 3-dichlorobenzene criterion for the protection of human health from consumption of organisms only is 2,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146225, 1, 3 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297534

Pollutant:

1, 3 -dichlorobenzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Dichlorobenzene, 1,3-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 3-dichlorobenzene criterion for the protection of human health from the consumption of water and organisms is 400 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146225, 1, 3 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297535

Pollutant:

1, 3 -dichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichlorobenzene, 1,3-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 3-dichlorobenzene criterion for the protection of human health from consumption of organisms only is 2,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146225, 1, 3 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294241

Pollutant:

1, 3 -dichlorobenzene

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 3-dichlorobenzene criterion for the protection of human health from consumption of organisms only is 2,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-24

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146225, 1, 3 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297525

Pollutant:

1, 3 -dichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Dichlorobenzene, 1,3-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 3-dichlorobenzene criterion for the protection of human health from consumption of organisms only is 2,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146225, 1, 3 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297523

Pollutant:

1, 3 -dichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichlorobenzene, 1,3-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 3-dichlorobenzene criterion for the protection of human health from consumption of organisms only is 2,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146225, 1, 3 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297504

Pollutant:

1, 3 -dichlorobenzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichlorobenzene, 1,3-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 3-dichlorobenzene criterion for the protection of human health from the consumption of water and organisms is 400 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146225, 1, 3 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297528

Pollutant:

1, 3 -dichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichlorobenzene, 1,3-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 3-dichlorobenzene criterion for the protection of human health from consumption of organisms only is 2,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146225, 1, 3 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297524

Pollutant:

1, 3 -dichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Dichlorobenzene, 1,3-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 3-dichlorobenzene criterion for the protection of human health from consumption of organisms only is 2,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146225, 1, 3 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297505

Pollutant:

1, 3 -dichlorobenzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Dichlorobenzene, 1,3-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 3-dichlorobenzene criterion for the protection of human health from the consumption of water and organisms is 400 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146225, 1, 3 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294237

Pollutant:

1, 3 -dichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 1, 3-dichlorobenzene criterion for the protection of human health from the consumption of water and organisms is 400 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-24

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146225, 1, 3 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297527

Pollutant:

1, 3 -dichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichlorobenzene, 1,3-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 3-dichlorobenzene criterion for the protection of human health from consumption of organisms only is 2,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146225, 1, 3 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297526

Pollutant:

1, 3 -dichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichlorobenzene, 1,3-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 3-dichlorobenzene criterion for the protection of human health from consumption of organisms only is 2,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146225, 1, 3 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297509

Pollutant:

1, 3 -dichlorobenzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichlorobenzene, 1,3-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 3-dichlorobenzene criterion for the protection of human health from the consumption of water and organisms is 400 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146225, 1, 3 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297506

Pollutant:

1, 3 -dichlorobenzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichlorobenzene, 1,3-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 3-dichlorobenzene criterion for the protection of human health from the consumption of water and organisms is 400 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146225, 1, 3 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294239

Pollutant:

1, 3 -dichlorobenzene

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 3-dichlorobenzene criterion for the protection of human health from consumption of organisms only is 2,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-24

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146225, 1, 3 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297531

Pollutant:

1, 3 -dichlorobenzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichlorobenzene, 1,3-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 3-dichlorobenzene criterion for the protection of human health from the consumption of water and organisms is 400 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146225, 1, 3 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297530

Pollutant:

1, 3 -dichlorobenzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichlorobenzene, 1,3-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 3-dichlorobenzene criterion for the protection of human health from the consumption of water and organisms is 400 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146225, 1, 3 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297537

Pollutant:

1, 3 -dichlorobenzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichlorobenzene, 1,3-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 3-dichlorobenzene criterion for the protection of human health from the consumption of water and organisms is 400 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146226	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	1, 4 -dichlorobenzene
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. 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:

Line of Evidence (LOE) for Decision ID 146226, 1, 4 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

298000

Pollutant:

1, 4 -dichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichlorobenzene, 1,4-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 4-dichlorobenzene criterion for the protection of human health from consumption of organisms only is 2,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146226, 1, 4 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

298001

Pollutant:

1, 4 -dichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichlorobenzene, 1,4-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 4-dichlorobenzene criterion for the protection of human health from consumption of organisms only is 2,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146226, 1, 4 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297598

Pollutant:

1, 4 -dichlorobenzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichlorobenzene, 1,4-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 4-Dichlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146226, 1, 4 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297626

Pollutant:

1, 4 -dichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Dichlorobenzene, 1,4-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 4-dichlorobenzene criterion for the protection of human health from consumption of organisms only is 2,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146226, 1, 4 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294263

Pollutant:

1, 4 -dichlorobenzene

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 4-dichlorobenzene criterion for the protection of human health from consumption of organisms only is 2,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146226, 1, 4 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297971

Pollutant:

1, 4 -dichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichlorobenzene, 1,4-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 4-dichlorobenzene criterion for the protection of human health from consumption of organisms only is 2,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146226, 1, 4 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

298002

Pollutant:

1, 4 -dichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichlorobenzene, 1,4-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 4-dichlorobenzene criterion for the protection of human health from consumption of organisms only is 2,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146226, 1, 4 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294262

Pollutant:

1, 4 -dichlorobenzene

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 4-dichlorobenzene criterion for the protection of human health from consumption of organisms only is 2,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146226, 1, 4 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

298004

Pollutant:

1, 4 -dichlorobenzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Dichlorobenzene, 1,4-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 4-Dichlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146226, 1, 4 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297599

Pollutant:

1, 4 -dichlorobenzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichlorobenzene, 1,4-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 4-Dichlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146226, 1, 4 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

298006

Pollutant:

1, 4 -dichlorobenzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichlorobenzene, 1,4-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 4-Dichlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146226, 1, 4 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297974

Pollutant:

1, 4 -dichlorobenzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichlorobenzene, 1,4-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 4-Dichlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146226, 1, 4 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297976

Pollutant:

1, 4 -dichlorobenzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichlorobenzene, 1,4-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 4-Dichlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146226, 1, 4 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

298003

Pollutant:

1, 4 -dichlorobenzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichlorobenzene, 1,4-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 4-Dichlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146226, 1, 4 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

298005

Pollutant:

1, 4 -dichlorobenzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Dichlorobenzene, 1,4-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 4-Dichlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146226, 1, 4 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297601

Pollutant:

1, 4 -dichlorobenzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichlorobenzene, 1,4-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 4-Dichlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146226, 1, 4 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297972

Pollutant:

1, 4 -dichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichlorobenzene, 1,4-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 4-dichlorobenzene criterion for the protection of human health from consumption of organisms only is 2,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146226, 1, 4 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297600

Pollutant:

1, 4 -dichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Dichlorobenzene, 1,4-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 4-dichlorobenzene criterion for the protection of human health from consumption of organisms only is 2,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146226, 1, 4 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294261

Pollutant:

1, 4 -dichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 Primary Maximum Contaminant Level for 1, 4-Dichlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146226, 1, 4 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297973

Pollutant:

1, 4 -dichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichlorobenzene, 1,4-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 4-dichlorobenzene criterion for the protection of human health from consumption of organisms only is 2,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146226, 1, 4 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297975

Pollutant:

1, 4 -dichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichlorobenzene, 1,4-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 4-dichlorobenzene criterion for the protection of human health from consumption of organisms only is 2,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146226, 1, 4 -dichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294260

Pollutant:

1, 4 -dichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 Primary Maximum Contaminant Level for 1, 4-Dichlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146218	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	1,1,1-Trichloroethane
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. 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:

Line of Evidence (LOE) for Decision ID 146218, 1,1,1-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297816

Pollutant:

1,1,1-Trichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Trichloroethane, 1,1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 1, 1-Trichloroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.200 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146218, 1,1,1-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297736

Pollutant:

1,1,1-Trichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Trichloroethane, 1,1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 1, 1-Trichloroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.200 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146218, 1,1,1-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297812

Pollutant:

1,1,1-Trichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Trichloroethane, 1,1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 1, 1-Trichloroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.200 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146218, 1,1,1-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296961

Pollutant:

1,1,1-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 Primary Maximum Contaminant Level for 1, 1, 1-Trichloroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.200 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146218, 1,1,1-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297818

Pollutant:

1,1,1-Trichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Trichloroethane, 1,1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 1, 1-Trichloroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.200 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146218, 1,1,1-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297813

Pollutant:

1,1,1-Trichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Trichloroethane, 1,1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 1, 1-Trichloroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.200 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146218, 1,1,1-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297817

Pollutant:

1,1,1-Trichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Trichloroethane, 1,1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 1, 1-Trichloroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.200 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146218, 1,1,1-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297737

Pollutant:

1,1,1-Trichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Trichloroethane, 1,1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 1, 1-Trichloroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.200 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146218, 1,1,1-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297738

Pollutant:

1,1,1-Trichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Trichloroethane, 1,1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 1, 1-Trichloroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.200 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146218, 1,1,1-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296962

Pollutant:

1,1,1-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 Primary Maximum Contaminant Level for 1, 1, 1-Trichloroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.200 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146218, 1,1,1-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297815

Pollutant:

1,1,1-Trichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Trichloroethane, 1,1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for 1, 1, 1-Trichloroethane incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.200 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146229	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	1,1,2,2-Tetrachloroethane
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. 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:

Line of Evidence (LOE) for Decision ID 146229, 1,1,2,2-Tetrachloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296765

Pollutant:

1,1,2,2-Tetrachloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Tetrachloroethane, 1,1,2,2-. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2, 2-tetrachloroethane criterion for the protection of human health from the consumption of water and organisms is 0.17 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146229, 1,1,2,2-Tetrachloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297967

Pollutant:

1,1,2,2-Tetrachloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Tetrachloroethane, 1,1,2,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2, 2-tetrachloroethane criterion for the protection of human health from the consumption of water and organisms is 0.17 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146229, 1,1,2,2-Tetrachloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296748

Pollutant:

1,1,2,2-Tetrachloroethane

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2, 2-tetrachloroethane criterion for the protection of human health from consumption of organisms only is 11 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146229, 1,1,2,2-Tetrachloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297940

Pollutant:

1,1,2,2-Tetrachloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Tetrachloroethane, 1,1,2,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2, 2-tetrachloroethane criterion for the protection of human health from consumption of organisms only is 11 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146229, 1,1,2,2-Tetrachloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297943

Pollutant:

1,1,2,2-Tetrachloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Tetrachloroethane, 1,1,2,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2, 2-tetrachloroethane criterion for the protection of human health from consumption of organisms only is 11 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146229, 1,1,2,2-Tetrachloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297964

Pollutant:

1,1,2,2-Tetrachloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Tetrachloroethane, 1,1,2,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2, 2-tetrachloroethane criterion for the protection of human health from consumption of organisms only is 11 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146229, 1,1,2,2-Tetrachloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297993

Pollutant:

1,1,2,2-Tetrachloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Tetrachloroethane, 1,1,2,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2, 2-tetrachloroethane criterion for the protection of human health from the consumption of water and organisms is 0.17 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146229, 1,1,2,2-Tetrachloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297015

Pollutant:

1,1,2,2-Tetrachloroethane

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2, 2-tetrachloroethane criterion for the protection of human health from consumption of organisms only is 11 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146229, 1,1,2,2-Tetrachloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297994

Pollutant:

1,1,2,2-Tetrachloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Tetrachloroethane, 1,1,2,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2, 2-tetrachloroethane criterion for the protection of human health from the consumption of water and organisms is 0.17 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146229, 1,1,2,2-Tetrachloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297913

Pollutant:

1,1,2,2-Tetrachloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Tetrachloroethane, 1,1,2,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2, 2-tetrachloroethane criterion for the protection of human health from consumption of organisms only is 11 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146229, 1,1,2,2-Tetrachloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297915

Pollutant:

1,1,2,2-Tetrachloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Tetrachloroethane, 1,1,2,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2, 2-tetrachloroethane criterion for the protection of human health from consumption of organisms only is 11 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146229, 1,1,2,2-Tetrachloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297965

Pollutant:

1,1,2,2-Tetrachloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Tetrachloroethane, 1,1,2,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2, 2-tetrachloroethane criterion for the protection of human health from the consumption of water and organisms is 0.17 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146229, 1,1,2,2-Tetrachloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297938

Pollutant:

1,1,2,2-Tetrachloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Tetrachloroethane, 1,1,2,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2, 2-tetrachloroethane criterion for the protection of human health from the consumption of water and organisms is 0.17 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146229, 1,1,2,2-Tetrachloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297939

Pollutant:

1,1,2,2-Tetrachloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Tetrachloroethane, 1,1,2,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2, 2-tetrachloroethane criterion for the protection of human health from the consumption of water and organisms is 0.17 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146229, 1,1,2,2-Tetrachloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297942

Pollutant:

1,1,2,2-Tetrachloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Tetrachloroethane, 1,1,2,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2, 2-tetrachloroethane criterion for the protection of human health from consumption of organisms only is 11 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146229, 1,1,2,2-Tetrachloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297941

Pollutant:

1,1,2,2-Tetrachloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Tetrachloroethane, 1,1,2,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2, 2-tetrachloroethane criterion for the protection of human health from the consumption of water and organisms is 0.17 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146229, 1,1,2,2-Tetrachloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297016

Pollutant:

1,1,2,2-Tetrachloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Tetrachloroethane, 1,1,2,2-. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2, 2-tetrachloroethane criterion for the protection of human health from the consumption of water and organisms is 0.17 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146229, 1,1,2,2-Tetrachloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297968

Pollutant:

1,1,2,2-Tetrachloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Tetrachloroethane, 1,1,2,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2, 2-tetrachloroethane criterion for the protection of human health from consumption of organisms only is 11 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146229, 1,1,2,2-Tetrachloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297937

Pollutant:

1,1,2,2-Tetrachloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Tetrachloroethane, 1,1,2,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2, 2-tetrachloroethane criterion for the protection of human health from consumption of organisms only is 11 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146229, 1,1,2,2-Tetrachloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297966

Pollutant:

1,1,2,2-Tetrachloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Tetrachloroethane, 1,1,2,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2, 2-tetrachloroethane criterion for the protection of human health from the consumption of water and organisms is 0.17 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146229, 1,1,2,2-Tetrachloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297995

Pollutant:

1,1,2,2-Tetrachloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Tetrachloroethane, 1,1,2,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2, 2-tetrachloroethane criterion for the protection of human health from the consumption of water and organisms is 0.17 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146229, 1,1,2,2-Tetrachloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297914

Pollutant:

1,1,2,2-Tetrachloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Tetrachloroethane, 1,1,2,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2, 2-tetrachloroethane criterion for the protection of human health from consumption of organisms only is 11 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146233	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	1,1,2-Trichloroethane
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. 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:

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297894

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA National Recommended Water Quality Criteria (Gold Book) for freshwater aquatic life protection, chronic Lowest Observed Effect Level is 9,400 ug/L.Â

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: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296978

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 1, 1, 2-trichloroethane criterion for the protection of human health from the consumption of water and organisms is 0.60 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

298079

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2-trichloroethane criterion for the protection of human health from consumption of organisms only is 42 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

298085

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2-trichloroethane criterion for the protection of human health from consumption of organisms only is 42 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297841

Pollutant:

1,1,2-Trichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2-trichloroethane criterion for the protection of human health from the consumption of water and organisms is 0.60 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297843

Pollutant:

1,1,2-Trichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2-trichloroethane criterion for the protection of human health from the consumption of water and organisms is 0.60 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297762

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA National Recommended Water Quality Criteria (Gold Book) for freshwater aquatic life protection, chronic Lowest Observed Effect Level is 9,400 ug/L.Â

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: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297839

Pollutant:

1,1,2-Trichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2-trichloroethane criterion for the protection of human health from the consumption of water and organisms is 0.60 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297890

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2-trichloroethane criterion for the protection of human health from consumption of organisms only is 42 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

298080

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2-trichloroethane criterion for the protection of human health from consumption of organisms only is 42 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297840

Pollutant:

1,1,2-Trichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2-trichloroethane criterion for the protection of human health from the consumption of water and organisms is 0.60 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296963

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

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:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA National Recommended Water Quality Criteria (Gold Book) for freshwater aquatic life protection, chronic Lowest Observed Effect Level is 9,400 ug/L.Â

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: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297892

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2-trichloroethane criterion for the protection of human health from consumption of organisms only is 42 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

298078

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA National Recommended Water Quality Criteria (Gold Book) for freshwater aquatic life protection, chronic Lowest Observed Effect Level is 9,400 ug/L.Â

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: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297760

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA National Recommended Water Quality Criteria (Gold Book) for freshwater aquatic life protection, chronic Lowest Observed Effect Level is 9,400 ug/L.Â

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: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297891

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2-trichloroethane criterion for the protection of human health from consumption of organisms only is 42 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297893

Pollutant:

1,1,2-Trichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2-trichloroethane criterion for the protection of human health from the consumption of water and organisms is 0.60 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297761

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2-trichloroethane criterion for the protection of human health from consumption of organisms only is 42 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297763

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA National Recommended Water Quality Criteria (Gold Book) for freshwater aquatic life protection, chronic Lowest Observed Effect Level is 9,400 ug/L.Â

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: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296977

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 1, 1, 2-trichloroethane criterion for the protection of human health from the consumption of water and organisms is 0.60 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296997

Pollutant:

1,1,2-Trichloroethane

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2-trichloroethane criterion for the protection of human health from consumption of organisms only is 42 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297844

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA National Recommended Water Quality Criteria (Gold Book) for freshwater aquatic life protection, chronic Lowest Observed Effect Level is 9,400 ug/L.Â

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: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297845

Pollutant:

1,1,2-Trichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2-trichloroethane criterion for the protection of human health from the consumption of water and organisms is 0.60 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296976

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

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:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA National Recommended Water Quality Criteria (Gold Book) for freshwater aquatic life protection, chronic Lowest Observed Effect Level is 9,400 ug/L.Â

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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297889

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA National Recommended Water Quality Criteria (Gold Book) for freshwater aquatic life protection, chronic Lowest Observed Effect Level is 9,400 ug/L.Â

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: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297764

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA National Recommended Water Quality Criteria (Gold Book) for freshwater aquatic life protection, chronic Lowest Observed Effect Level is 9,400 ug/L.Â

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: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297765

Pollutant:

1,1,2-Trichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2-trichloroethane criterion for the protection of human health from the consumption of water and organisms is 0.60 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297842

Pollutant:

1,1,2-Trichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2-trichloroethane criterion for the protection of human health from the consumption of water and organisms is 0.60 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296975

Pollutant:

1,1,2-Trichloroethane

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2-trichloroethane criterion for the protection of human health from consumption of organisms only is 42 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

298077

Pollutant:

1,1,2-Trichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2-trichloroethane criterion for the protection of human health from the consumption of water and organisms is 0.60 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

298081

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA National Recommended Water Quality Criteria (Gold Book) for freshwater aquatic life protection, chronic Lowest Observed Effect Level is 9,400 ug/L.Â

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: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

298084

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2-trichloroethane criterion for the protection of human health from consumption of organisms only is 42 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146233, 1,1,2-Trichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

298076

Pollutant:

1,1,2-Trichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Trichloroethane, 1,1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1, 2-trichloroethane criterion for the protection of human health from consumption of organisms only is 42 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146120	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	1,1-Dichloroethylene (DCE)/ Vinylidene Chloride
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. 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:

Line of Evidence (LOE) for Decision ID 146120, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297770

Pollutant:

1,1-Dichloroethylene (DCE)/ Vinylidene 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:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloroethylene, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1-dichloroethylene criterion for the protection of human health from the consumption of water and organisms is 0.057 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146120, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297794

Pollutant:

1,1-Dichloroethylene (DCE)/ Vinylidene Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloroethylene, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1-dichloroethylene criterion for the protection of human health from consumption of organisms only is 3.2 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146120, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297793

Pollutant:

1,1-Dichloroethylene (DCE)/ Vinylidene Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Dichloroethylene, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1-dichloroethylene criterion for the protection of human health from consumption of organisms only is 3.2 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146120, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297820

Pollutant:

1,1-Dichloroethylene (DCE)/ Vinylidene 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:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Dichloroethylene, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1-dichloroethylene criterion for the protection of human health from the consumption of water and organisms is 0.057 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146120, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297766

Pollutant:

1,1-Dichloroethylene (DCE)/ Vinylidene 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:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloroethylene, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1-dichloroethylene criterion for the protection of human health from the consumption of water and organisms is 0.057 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146120, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297822

Pollutant:

1,1-Dichloroethylene (DCE)/ Vinylidene Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloroethylene, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1-dichloroethylene criterion for the protection of human health from consumption of organisms only is 3.2 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146120, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297821

Pollutant:

1,1-Dichloroethylene (DCE)/ Vinylidene 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:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloroethylene, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1-dichloroethylene criterion for the protection of human health from the consumption of water and organisms is 0.057 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146120, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293979

Pollutant:

1,1-Dichloroethylene (DCE)/ Vinylidene Chloride

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1-dichloroethylene criterion for the protection of human health from consumption of organisms only is 3.2 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146120, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297824

Pollutant:

1,1-Dichloroethylene (DCE)/ Vinylidene Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Dichloroethylene, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1-dichloroethylene criterion for the protection of human health from consumption of organisms only is 3.2 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146120, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297772

Pollutant:

1,1-Dichloroethylene (DCE)/ Vinylidene 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:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloroethylene, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1-dichloroethylene criterion for the protection of human health from the consumption of water and organisms is 0.057 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146120, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297771

Pollutant:

1,1-Dichloroethylene (DCE)/ Vinylidene 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:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloroethylene, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1-dichloroethylene criterion for the protection of human health from the consumption of water and organisms is 0.057 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146120, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293999

Pollutant:

1,1-Dichloroethylene (DCE)/ Vinylidene Chloride

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1-dichloroethylene criterion for the protection of human health from consumption of organisms only is 3.2 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146120, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297767

Pollutant:

1,1-Dichloroethylene (DCE)/ Vinylidene 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:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Dichloroethylene, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1-dichloroethylene criterion for the protection of human health from the consumption of water and organisms is 0.057 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146120, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297768

Pollutant:

1,1-Dichloroethylene (DCE)/ Vinylidene 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:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloroethylene, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1-dichloroethylene criterion for the protection of human health from the consumption of water and organisms is 0.057 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146120, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297797

Pollutant:

1,1-Dichloroethylene (DCE)/ Vinylidene Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloroethylene, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1-dichloroethylene criterion for the protection of human health from consumption of organisms only is 3.2 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146120, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297795

Pollutant:

1,1-Dichloroethylene (DCE)/ Vinylidene Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloroethylene, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1-dichloroethylene criterion for the protection of human health from consumption of organisms only is 3.2 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146120, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294002

Pollutant:

1,1-Dichloroethylene (DCE)/ Vinylidene Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dichloroethylene, 1,1-. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1-dichloroethylene criterion for the protection of human health from the consumption of water and organisms is 0.057 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146120, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294001

Pollutant:

1,1-Dichloroethylene (DCE)/ Vinylidene Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dichloroethylene, 1,1-. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1-dichloroethylene criterion for the protection of human health from the consumption of water and organisms is 0.057 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146120, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297745

Pollutant:

1,1-Dichloroethylene (DCE)/ Vinylidene Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloroethylene, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1-dichloroethylene criterion for the protection of human health from consumption of organisms only is 3.2 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146120, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297769

Pollutant:

1,1-Dichloroethylene (DCE)/ Vinylidene 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:

Water Board staff assessed eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloroethylene, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1-dichloroethylene criterion for the protection of human health from the consumption of water and organisms is 0.057 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146120, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297823

Pollutant:

1,1-Dichloroethylene (DCE)/ Vinylidene Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloroethylene, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1-dichloroethylene criterion for the protection of human health from consumption of organisms only is 3.2 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146120, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297796

Pollutant:

1,1-Dichloroethylene (DCE)/ Vinylidene Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloroethylene, 1,1-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 1-dichloroethylene criterion for the protection of human health from consumption of organisms only is 3.2 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146128	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	1,2,4-Trichlorobenzene
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:

Line of Evidence (LOE) for Decision ID 146128, 1,2,4-Trichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296942

Pollutant:

1,2,4-Trichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 1, 2, 4-Trichlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-24

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146128, 1,2,4-Trichlorobenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296958

Pollutant:

1,2,4-Trichlorobenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 1, 2, 4-Trichlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-24

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146139	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	1,2-Dichloroethane
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. 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:

Line of Evidence (LOE) for Decision ID 146139, 1,2-Dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297690

Pollutant:

1,2-Dichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloroethane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloroethane criterion for the protection of human health from the consumption of water and organisms is 0.38 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146139, 1,2-Dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297714

Pollutant:

1,2-Dichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloroethane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloroethane criterion for the protection of human health from the consumption of water and organisms is 0.38 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146139, 1,2-Dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297743

Pollutant:

1,2-Dichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloroethane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloroethane criterion for the protection of human health from the consumption of water and organisms is 0.38 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146139, 1,2-Dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297658

Pollutant:

1,2-Dichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Dichloroethane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloroethane criterion for the protection of human health from consumption of organisms only is 99 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146139, 1,2-Dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293975

Pollutant:

1,2-Dichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dichloroethane, 1,2-. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloroethane criterion for the protection of human health from the consumption of water and organisms is 0.38 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146139, 1,2-Dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297744

Pollutant:

1,2-Dichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloroethane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloroethane criterion for the protection of human health from the consumption of water and organisms is 0.38 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146139, 1,2-Dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297717

Pollutant:

1,2-Dichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloroethane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloroethane criterion for the protection of human health from consumption of organisms only is 99 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146139, 1,2-Dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297661

Pollutant:

1,2-Dichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloroethane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloroethane criterion for the protection of human health from consumption of organisms only is 99 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146139, 1,2-Dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293976

Pollutant:

1,2-Dichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dichloroethane, 1,2-. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloroethane criterion for the protection of human health from the consumption of water and organisms is 0.38 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146139, 1,2-Dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293957

Pollutant:

1,2-Dichloroethane

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloroethane criterion for the protection of human health from consumption of organisms only is 99 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146139, 1,2-Dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297688

Pollutant:

1,2-Dichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Dichloroethane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloroethane criterion for the protection of human health from consumption of organisms only is 99 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146139, 1,2-Dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293977

Pollutant:

1,2-Dichloroethane

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloroethane criterion for the protection of human health from consumption of organisms only is 99 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146139, 1,2-Dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297740

Pollutant:

1,2-Dichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloroethane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloroethane criterion for the protection of human health from consumption of organisms only is 99 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146139, 1,2-Dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297742

Pollutant:

1,2-Dichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Dichloroethane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloroethane criterion for the protection of human health from the consumption of water and organisms is 0.38 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146139, 1,2-Dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297716

Pollutant:

1,2-Dichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloroethane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloroethane criterion for the protection of human health from consumption of organisms only is 99 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146139, 1,2-Dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297712

Pollutant:

1,2-Dichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloroethane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloroethane criterion for the protection of human health from the consumption of water and organisms is 0.38 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146139, 1,2-Dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297715

Pollutant:

1,2-Dichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloroethane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloroethane criterion for the protection of human health from the consumption of water and organisms is 0.38 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146139, 1,2-Dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297711

Pollutant:

1,2-Dichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloroethane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloroethane criterion for the protection of human health from the consumption of water and organisms is 0.38 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146139, 1,2-Dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297739

Pollutant:

1,2-Dichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloroethane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloroethane criterion for the protection of human health from consumption of organisms only is 99 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146139, 1,2-Dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297689

Pollutant:

1,2-Dichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloroethane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloroethane criterion for the protection of human health from consumption of organisms only is 99 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146139, 1,2-Dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297741

Pollutant:

1,2-Dichloroethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Dichloroethane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloroethane criterion for the protection of human health from the consumption of water and organisms is 0.38 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146139, 1,2-Dichloroethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297713

Pollutant:

1,2-Dichloroethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloroethane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloroethane criterion for the protection of human health from consumption of organisms only is 99 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146208	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	1,2-Dichloroethylene,-trans
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. 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:

Line of Evidence (LOE) for Decision ID 146208, 1,2-Dichloroethylene,-trans	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297950

Pollutant:

1,2-Dichloroethylene,-trans

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Dichloroethylene, trans 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for 1, 2-trans-dichloroethylene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.01 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146208, 1,2-Dichloroethylene,-trans	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297952

Pollutant:

1,2-Dichloroethylene,-trans

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality threshold for Dichloroethylene, trans 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for 1, 2-trans-dichloroethylene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.01 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146208, 1,2-Dichloroethylene,-trans	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297923

Pollutant:

1,2-Dichloroethylene,-trans

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Dichloroethylene, trans 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-trans-dichloroethylene criterion for the protection of human health from consumption of organisms only is 140,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146208, 1,2-Dichloroethylene,-trans	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297926

Pollutant:

1,2-Dichloroethylene,-trans

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloroethylene, trans 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-trans-dichloroethylene criterion for the protection of human health from consumption of organisms only is 140,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146208, 1,2-Dichloroethylene,-trans	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297898

Pollutant:

1,2-Dichloroethylene,-trans

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Dichloroethylene, trans 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-trans-dichloroethylene criterion for the protection of human health from consumption of organisms only is 140,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146208, 1,2-Dichloroethylene,-trans	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294025

Pollutant:

1,2-Dichloroethylene,-trans

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-trans-dichloroethylene criterion for the protection of human health from consumption of organisms only is 140,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146208, 1,2-Dichloroethylene,-trans	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294023

Pollutant:

1,2-Dichloroethylene,-trans

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-trans-dichloroethylene criterion for the protection of human health from consumption of organisms only is 140,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146208, 1,2-Dichloroethylene,-trans	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297927

Pollutant:

1,2-Dichloroethylene,-trans

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Dichloroethylene, trans 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-trans-dichloroethylene criterion for the protection of human health from consumption of organisms only is 140,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146208, 1,2-Dichloroethylene,-trans	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297951

Pollutant:

1,2-Dichloroethylene,-trans

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloroethylene, trans 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for 1, 2-trans-dichloroethylene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.01 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146208, 1,2-Dichloroethylene,-trans	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297896

Pollutant:

1,2-Dichloroethylene,-trans

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality threshold for Dichloroethylene, trans 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-trans-dichloroethylene criterion for the protection of human health from consumption of organisms only is 140,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146208, 1,2-Dichloroethylene,-trans	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297901

Pollutant:

1,2-Dichloroethylene,-trans

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Dichloroethylene, trans 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-trans-dichloroethylene criterion for the protection of human health from consumption of organisms only is 140,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146208, 1,2-Dichloroethylene,-trans	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297925

Pollutant:

1,2-Dichloroethylene,-trans

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Dichloroethylene, trans 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for 1, 2-trans-dichloroethylene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.01 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146208, 1,2-Dichloroethylene,-trans	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294026

Pollutant:

1,2-Dichloroethylene,-trans

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 1, 2-trans-dichloroethylene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.01 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146208, 1,2-Dichloroethylene,-trans	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297953

Pollutant:

1,2-Dichloroethylene,-trans

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Dichloroethylene, trans 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for 1, 2-trans-dichloroethylene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.01 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146208, 1,2-Dichloroethylene,-trans	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297900

Pollutant:

1,2-Dichloroethylene,-trans

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Dichloroethylene, trans 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-trans-dichloroethylene criterion for the protection of human health from consumption of organisms only is 140,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146208, 1,2-Dichloroethylene,-trans	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297924

Pollutant:

1,2-Dichloroethylene,-trans

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Dichloroethylene, trans 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for 1, 2-trans-dichloroethylene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.01 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146208, 1,2-Dichloroethylene,-trans	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294024

Pollutant:

1,2-Dichloroethylene,-trans

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 1, 2-trans-dichloroethylene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.01 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146208, 1,2-Dichloroethylene,-trans	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297897

Pollutant:

1,2-Dichloroethylene,-trans

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloroethylene, trans 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-trans-dichloroethylene criterion for the protection of human health from consumption of organisms only is 140,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146208, 1,2-Dichloroethylene,-trans	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297899

Pollutant:

1,2-Dichloroethylene,-trans

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloroethylene, trans 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-trans-dichloroethylene criterion for the protection of human health from consumption of organisms only is 140,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146208, 1,2-Dichloroethylene,-trans	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297928

Pollutant:

1,2-Dichloroethylene,-trans

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Dichloroethylene, trans 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for 1, 2-trans-dichloroethylene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.01 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146208, 1,2-Dichloroethylene,-trans	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297954

Pollutant:

1,2-Dichloroethylene,-trans

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloroethylene, trans 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for 1, 2-trans-dichloroethylene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.01 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146208, 1,2-Dichloroethylene,-trans	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297929

Pollutant:

1,2-Dichloroethylene,-trans

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloroethylene, trans 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for 1, 2-trans-dichloroethylene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.01 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146143	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	1,2-Dichloropropane
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. 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:

Line of Evidence (LOE) for Decision ID 146143, 1,2-Dichloropropane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

298013

Pollutant:

1,2-Dichloropropane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloropropane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloropropane criterion for the protection of human health from the consumption of water and organisms is 0.52 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146143, 1,2-Dichloropropane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297981

Pollutant:

1,2-Dichloropropane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloropropane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloropropane criterion for the protection of human health from the consumption of water and organisms is 0.52 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146143, 1,2-Dichloropropane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

298009

Pollutant:

1,2-Dichloropropane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloropropane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloropropane criterion for the protection of human health from consumption of organisms only is 39 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146143, 1,2-Dichloropropane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294181

Pollutant:

1,2-Dichloropropane

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloropropane criterion for the protection of human health from consumption of organisms only is 39 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146143, 1,2-Dichloropropane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297980

Pollutant:

1,2-Dichloropropane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloropropane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloropropane criterion for the protection of human health from the consumption of water and organisms is 0.52 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146143, 1,2-Dichloropropane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297605

Pollutant:

1,2-Dichloropropane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloropropane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloropropane criterion for the protection of human health from the consumption of water and organisms is 0.52 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146143, 1,2-Dichloropropane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297983

Pollutant:

1,2-Dichloropropane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloropropane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloropropane criterion for the protection of human health from the consumption of water and organisms is 0.52 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146143, 1,2-Dichloropropane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297982

Pollutant:

1,2-Dichloropropane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloropropane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloropropane criterion for the protection of human health from the consumption of water and organisms is 0.52 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146143, 1,2-Dichloropropane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294177

Pollutant:

1,2-Dichloropropane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 1, 2-dichloropropane criterion for the protection of human health from the consumption of water and organisms is 0.52 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146143, 1,2-Dichloropropane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

298012

Pollutant:

1,2-Dichloropropane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloropropane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloropropane criterion for the protection of human health from consumption of organisms only is 39 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146143, 1,2-Dichloropropane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

298011

Pollutant:

1,2-Dichloropropane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloropropane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloropropane criterion for the protection of human health from consumption of organisms only is 39 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146143, 1,2-Dichloropropane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297606

Pollutant:

1,2-Dichloropropane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Dichloropropane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloropropane criterion for the protection of human health from consumption of organisms only is 39 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146143, 1,2-Dichloropropane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297984

Pollutant:

1,2-Dichloropropane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloropropane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloropropane criterion for the protection of human health from the consumption of water and organisms is 0.52 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146143, 1,2-Dichloropropane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294179

Pollutant:

1,2-Dichloropropane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 1, 2-dichloropropane criterion for the protection of human health from the consumption of water and organisms is 0.52 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146143, 1,2-Dichloropropane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297978

Pollutant:

1,2-Dichloropropane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloropropane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloropropane criterion for the protection of human health from consumption of organisms only is 39 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146143, 1,2-Dichloropropane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297979

Pollutant:

1,2-Dichloropropane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Dichloropropane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloropropane criterion for the protection of human health from the consumption of water and organisms is 0.52 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146143, 1,2-Dichloropropane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297608

Pollutant:

1,2-Dichloropropane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Dichloropropane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloropropane criterion for the protection of human health from consumption of organisms only is 39 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146143, 1,2-Dichloropropane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297611

Pollutant:

1,2-Dichloropropane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Dichloropropane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloropropane criterion for the protection of human health from the consumption of water and organisms is 0.52 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146143, 1,2-Dichloropropane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297956

Pollutant:

1,2-Dichloropropane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dichloropropane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloropropane criterion for the protection of human health from consumption of organisms only is 39 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146143, 1,2-Dichloropropane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294180

Pollutant:

1,2-Dichloropropane

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloropropane criterion for the protection of human health from consumption of organisms only is 39 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146143, 1,2-Dichloropropane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297955

Pollutant:

1,2-Dichloropropane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloropropane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloropropane criterion for the protection of human health from consumption of organisms only is 39 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146143, 1,2-Dichloropropane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

298010

Pollutant:

1,2-Dichloropropane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dichloropropane, 1,2-.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 1, 2-dichloropropane criterion for the protection of human health from consumption of organisms only is 39 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146154	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	1,3-Dichloropropene
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:

Line of Evidence (LOE) for Decision ID 146154, 1,3-Dichloropropene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294200

Pollutant:

1,3-Dichloropropene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 Primary Maximum Contaminant Level for 1, 3-Dichloropropene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.0005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146154, 1,3-Dichloropropene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294201

Pollutant:

1,3-Dichloropropene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 Primary Maximum Contaminant Level for 1, 3-Dichloropropene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.0005 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146159	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	2,2'-Dichlorodiethyl ether
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:

Line of Evidence (LOE) for Decision ID 146159, 2,2'-Dichlorodiethyl ether	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293282

Pollutant:

2,2'-Dichlorodiethyl ether

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Bis(2-chloroethyl)ether. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bis(2-chloroethyl)ether criteria for the protection of human health from the consumption of water and organisms is 0.031 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146159, 2,2'-Dichlorodiethyl ether	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293279

Pollutant:

2,2'-Dichlorodiethyl ether

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Bis(2-chloroethyl)ether. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bis(2-chloroethyl)ether criteria for the protection of human health from the consumption of water and organisms is 0.031 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146159, 2,2'-Dichlorodiethyl ether	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293280

Pollutant:

2,2'-Dichlorodiethyl ether

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 SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Bis(2-chloroethyl)ether.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bis(2-chloroethyl)ether criterion for the protection of human health from consumption of organisms only is 1.4 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146159, 2,2'-Dichlorodiethyl ether	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293606

Pollutant:

2,2'-Dichlorodiethyl ether

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:

Non-SWAMP

Water Quality Objective/Criterion:

The bis(2-chloroethyl)ether criterion for the protection of human health from consumption of organisms only is 1.4 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146180	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	2,4,6-Trichlorophenol
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:

Line of Evidence (LOE) for Decision ID 146180, 2,4,6-Trichlorophenol	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297042

Pollutant:

2,4,6-Trichlorophenol

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 2, 4, 6-trichlorophenol criterion for the protection of human health from consumption of organisms only is 6.5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146180, 2,4,6-Trichlorophenol	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297024

Pollutant:

2,4,6-Trichlorophenol

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 2, 4, 6-trichlorophenol criterion for the protection of human health from the consumption of water and organisms is 2.1 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146180, 2,4,6-Trichlorophenol	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297045

Pollutant:

2,4,6-Trichlorophenol

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 2, 4, 6-trichlorophenol criterion for the protection of human health from consumption of organisms only is 6.5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146180, 2,4,6-Trichlorophenol	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297025

Pollutant:

2,4,6-Trichlorophenol

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 2, 4, 6-trichlorophenol criterion for the protection of human health from the consumption of water and organisms is 2.1 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146188	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	2,4-Dichlorophenol
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:

Line of Evidence (LOE) for Decision ID 146188, 2,4-Dichlorophenol	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294066

Pollutant:

2,4-Dichlorophenol

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 2, 4-dichlorophenol criterion for the protection of human health from the consumption of water and organisms is 93 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146188, 2,4-Dichlorophenol	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294049

Pollutant:

2,4-Dichlorophenol

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 2, 4-dichlorophenol criterion for the protection of human health from the consumption of water and organisms is 93 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146188, 2,4-Dichlorophenol	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294067

Pollutant:

2,4-Dichlorophenol

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 2, 4-dichlorophenol criterion for the protection of human health from the consumption of organisms only is 790 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146188, 2,4-Dichlorophenol	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294047

Pollutant:

2,4-Dichlorophenol

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 2, 4-dichlorophenol criterion for the protection of human health from the consumption of organisms only is 790 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146189	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	2,4-Dimethylphenol
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:

Line of Evidence (LOE) for Decision ID 146189, 2,4-Dimethylphenol	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293964

Pollutant:

2,4-Dimethylphenol

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 2, 4-dimethylphenol criterion for the protection of human health from the consumption of water and organisms is 540 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146189, 2,4-Dimethylphenol	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293965

Pollutant:

2,4-Dimethylphenol

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 2, 4-dimethylphenol criterion for the protection of human health from the consumption of water and organisms is 540 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146189, 2,4-Dimethylphenol	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293966

Pollutant:

2,4-Dimethylphenol

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 2, 4-dimethylphenol criterion for the protection of human health from consumption of organisms only is 2,300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146189, 2,4-Dimethylphenol	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293968

Pollutant:

2,4-Dimethylphenol

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 2, 4-dimethylphenol criterion for the protection of human health from consumption of organisms only is 2,300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146191	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	2,4-Dinitrophenol
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:

Line of Evidence (LOE) for Decision ID 146191, 2,4-Dinitrophenol	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294032

Pollutant:

2,4-Dinitrophenol

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 2, 4-dinitrophenol criterion for the protection of human health from consumption of organisms only is 14,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146191, 2,4-Dinitrophenol	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294010

Pollutant:

2,4-Dinitrophenol

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 2, 4-dinitrophenol criterion for the protection of human health from the consumption of water and organisms is 70 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146191, 2,4-Dinitrophenol	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294011

Pollutant:

2,4-Dinitrophenol

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 2, 4-dinitrophenol criterion for the protection of human health from the consumption of water and organisms is 70 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146191, 2,4-Dinitrophenol	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294014

Pollutant:

2,4-Dinitrophenol

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 2, 4-dinitrophenol criterion for the protection of human health from consumption of organisms only is 14,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146194	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	2,4-Dinitrotoluene
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:

Line of Evidence (LOE) for Decision ID 146194, 2,4-Dinitrotoluene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294056

Pollutant:

2,4-Dinitrotoluene

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 2, 4-dinitrotoluene criterion for the protection of human health from the consumption of organisms only is 9.1 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-24

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146194, 2,4-Dinitrotoluene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294101

Pollutant:

2,4-Dinitrotoluene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 2, 4-dinitrotoluene criterion for the protection of human health from the consumption of water and organisms is 0.11 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-24

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146194, 2,4-Dinitrotoluene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294033

Pollutant:

2,4-Dinitrotoluene

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 2, 4-dinitrotoluene criterion for the protection of human health from the consumption of organisms only is 9.1 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-24

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146194, 2,4-Dinitrotoluene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294100

Pollutant:

2,4-Dinitrotoluene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 2, 4-dinitrotoluene criterion for the protection of human health from the consumption of water and organisms is 0.11 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-24

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146202	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	2-Chloronaphthalene
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:

Line of Evidence (LOE) for Decision ID 146202, 2-Chloronaphthalene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293371

Pollutant:

2-Chloronaphthalene

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 2-chloronaphthalene 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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146202, 2-Chloronaphthalene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293373

Pollutant:

2-Chloronaphthalene

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 2-chloronaphthalene 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: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146202, 2-Chloronaphthalene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293372

Pollutant:

2-Chloronaphthalene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 2-chloronaphthalene criterion for the protection of human health from the consumption of water and organisms is 1,700 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146202, 2-Chloronaphthalene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293374

Pollutant:

2-Chloronaphthalene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 2-chloronaphthalene criterion for the protection of human health from the consumption of water and organisms is 1,700 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146211	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	3,3'-Dichlorobenzidine
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.

Line of Evidence (LOE) for Decision ID 146211, 3,3'-Dichlorobenzidine	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293929

Pollutant:

3,3'-Dichlorobenzidine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dichlorobenzidine, 3,3'-. Although a total of 5 samples were collected, 5 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 3, 3-dichlorobenzidine criterion for the protection of human health from the consumption of water and organisms is 0.04 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146211, 3,3'-Dichlorobenzidine	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293932

Pollutant:

3,3'-Dichlorobenzidine

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 SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dichlorobenzidine, 3,3'-. Although a total of 5 samples were collected, 5 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 3, 3-dichlorobenzidine criterion for the protection of human health from consumption of organisms only is 0.077 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146211, 3,3'-Dichlorobenzidine	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293928

Pollutant:

3,3'-Dichlorobenzidine

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 SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dichlorobenzidine, 3,3'-. Although a total of 5 samples were collected, 5 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 3, 3-dichlorobenzidine criterion for the protection of human health from consumption of organisms only is 0.077 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146211, 3,3'-Dichlorobenzidine	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293952

Pollutant:

3,3'-Dichlorobenzidine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dichlorobenzidine, 3,3'-. Although a total of 5 samples were collected, 5 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 3, 3-dichlorobenzidine criterion for the protection of human health from the consumption of water and organisms is 0.04 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146219	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Acenaphthene
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:

Line of Evidence (LOE) for Decision ID 146219, Acenaphthene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

292859

Pollutant:

Acenaphthene

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:

Non-SWAMP

Water Quality Objective/Criterion:

The acenaphthene criterion for the protection of human health from consumption of organisms only is 2,700 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2015-02-07

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146219, Acenaphthene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

292863

Pollutant:

Acenaphthene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Acenaphthene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The acenaphthene criterion for the protection of human health from the consumption of water and organisms is 1,200 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146219, Acenaphthene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

292821

Pollutant:

Acenaphthene

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:

Non-SWAMP

Water Quality Objective/Criterion:

The acenaphthene criterion for the protection of human health from consumption of organisms only is 2,700 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146219, Acenaphthene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

292861

Pollutant:

Acenaphthene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 acenaphthene criterion for the protection of human health from the consumption of water and organisms is 1,200 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2015-02-07

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146230	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Aldrin
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:

Line of Evidence (LOE) for Decision ID 146230, Aldrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

292943

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The aldrin criterion 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:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-05-01 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146230, Aldrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

292796

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The aldrin criterion maximum concentration (expressed as a 1-day average) to protect aquatic life in freshwater is 1.5 ug/L. The criterion of 3 ug/L provided in the California Toxics Rule is an instantaneous maximum concentration and was divided by 2 in order to better represent a criterion maximum concentration (CMC) value as specified in footnote (g) of Table (b)(1) of the California Toxics Rule (2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2012-05-01 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146230, Aldrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

292797

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:

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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2012-05-01 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146230, Aldrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

292801

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA 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 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The aldrin criterion for the protection 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:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-05-01 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146230, Aldrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

292813

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The aldrin criterion for the protection 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:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-05-01 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Habitat, Tissue data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146230, Aldrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297175

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:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Discharges shall not result in pesticide concentrations in bottom sediments or aquaticlife that adversely affect beneficial uses. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

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:

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146230, Aldrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

292945

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA 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 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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The aldrin criterion 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:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-05-01 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQX data for the 2020/2022 integrated report in Region 5.


DECISION ID	134698	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Alkalinity as CaCO3
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 3.2 of the Listing Policy. The number of measured exceedances is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for conventional 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 this water segment-pollutant combination should not be placed on the CWA section 303(d) List. Refer to the lines of evidence in this fact sheet for the data and information, sample counts and exceedances, quality assurance documentation, beneficial uses, and water quality objectives or numeric evaluation guidelines relied upon for this decision.

Regional Board Decision Recommendation:	After review of 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 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 applicable water quality standards for the pollutant are not exceeded.

Line of Evidence (LOE) for Decision ID 134698, Alkalinity as CaCO3	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

241201

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:

Water Board staff assessed STORET data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 8 of 63 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Alkalinity as CaCO3 levels were assessed for the protection of freshwater aquatic life by comparison to the Evaluation Guideline value of 20,000 ug/L (4 day average)(National Recommended Water Quality Criteria, 2009).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (CALWR_WQX-A0714010)

Temporal Representation:

The samples were collected between the dates of 2010-09-08 and 2016-04-04

Environmental Conditions:

QAPP Information:

STORET

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 134698, Alkalinity as CaCO3	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293249

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses.

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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134698, Alkalinity as CaCO3	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

292875

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support and results are as follows: 1 of 20 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses.

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: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146114	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Allethrin
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. 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:

Line of Evidence (LOE) for Decision ID 146114, Allethrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293064

Pollutant:

Allethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

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:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan for the Sacramento and San Joaquin River Basins).

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for allethrin is the USEPA Aquatic Life Benchmark of 1.05 ug/L for an invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2012-02-29 and 2015-02-07

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146114, Allethrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293046

Pollutant:

Allethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Allethrin.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for allethrin is the USEPA Aquatic Life Benchmark of 1.05 ug/L for an invertebrate (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	153149	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Aluminum
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:	During the 2024 Cycle LOEs were updated due to a reassessment of data based on the Central Valley Water Board CV-SALTS Secondary MCL Policy. During 2024 cycle, the 1988 National Recommended Water Quality Criteria used to assess aluminum data was replaced with U.S. EPA’s 2018 Final Recommended Aquatic Life Criteria for Aluminum in Freshwater. 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.

Line of Evidence (LOE) for Decision ID 153149, Aluminum	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

314673

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 chemical constituents in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 153149, Aluminum	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

314668

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:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

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: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 153149, Aluminum	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

314678

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Aluminum.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

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: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2020-01-15 and 2020-07-23

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 153149, Aluminum	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

314659

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:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 153149, Aluminum	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

311549

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Secondary Maximum Contaminant Level for aluminum incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.2 mg/L assessed as an annual average.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-12-06 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 153149, Aluminum	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

311548

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:

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: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-12-06 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 153149, Aluminum	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

314676

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 chemical constituents in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

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: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146115	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Anthracene
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.

Line of Evidence (LOE) for Decision ID 146115, Anthracene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293032

Pollutant:

Anthracene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support and results are as follows: 0 of 8 samples exceeded the water quality threshold for Anthracene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The anthracene criterion for the protection of human health from the consumption of water and organisms is 9,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146115, Anthracene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293011

Pollutant:

Anthracene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 anthracene criterion for the protection of human health from the consumption of water and organisms is 9,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2015-02-07

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146115, Anthracene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297267

Pollutant:

Anthracene

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:

Evaluation Guideline:

The evaluation guideline for Anthrazene from MacDonald et al., 2000a which states that the probable effect concentration for Anthracene is 845 ug/kg. (dw = Dry Weight)

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-08-19 to 2016-07-27

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146115, Anthracene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293031

Pollutant:

Anthracene

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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The anthracene criterion for the protection of human health from consumption of organisms only is 110,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2015-02-07

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 146115, Anthracene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59754

Pollutant:

Anthracene

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:

SWAMP data indicates that 0 of the sample results exceed the evaluation guideline value for Anthracene.

Data Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for anthracene is 845 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 was collected at one monitoring site [ American R @ Discovery Park - 519AMNDVY]

Temporal Representation:

Data was collected on 7/16/2008.

Environmental Conditions:

Staff is not 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 146115, Anthracene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293013

Pollutant:

Anthracene

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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The anthracene criterion for the protection of human health from consumption of organisms only is 110,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):


DECISION ID	146118	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

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:	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.

Line of Evidence (LOE) for Decision ID 146118, Arsenic	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59770

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:

SWAMP data indicates that 0 of the sample results exceed the evaluation guideline value for Arsenic.

Data Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins).

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 was collected at one monitoring site [ American R @ Discovery Park - 519AMNDVY]

Temporal Representation:

Data was collected on 7/16/2008.

Environmental Conditions:

Staff is not 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 146118, Arsenic	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

303819

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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Basin Plan objective for arsenic in this water body is 0.01 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Discovery)

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146118, Arsenic	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

303818

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:

The Basin Plan objective for arsenic in this water body is 0.01 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Discovery)

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146118, Arsenic	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297270

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:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Arsenic from MacDonald et al., 2000a which states that the probable effect concentration for Arsenic is 33 mg/kg. (dw = Dry Weight)

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-08-19 to 2018-07-09

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.


DECISION ID	146163	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

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 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.

Line of Evidence (LOE) for Decision ID 146163, Azinphos-methyl (Guthion)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

292994

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Azinphos Methyl. Although a total of 15 samples were collected, 15 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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-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:

Evaluation Guideline:

The USEPA National Recommended Water Quality Criteria for azinphos methyl for freshwater aquatic life protection is 0.01 ug/l (instantaneous maximum)

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-04-19 to 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146163, Azinphos-methyl (Guthion)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

292997

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Azinphos Methyl. Although a total of 13 samples were collected, 13 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:

SWAMP Data:

Non-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:

Evaluation Guideline:

The USEPA National Recommended Water Quality Criteria for azinphos methyl for freshwater aquatic life protection is 0.01 ug/l (instantaneous maximum)

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-01-21 to 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

California Stream Condition Index (CSCI) Scores for the 2024 Integrated Report for Region 5, Sacramento River sub-region.


DECISION ID	151391	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Benthic Community Effects
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:	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 three benthic-macroinvertebrate samples exceed the California Stream Condition Index (CSCI) impairment threshold. A minimum of two benthic-macroinvertebrate samples are needed to assess listing status. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against 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. Two of three benthic-macroinvertebrate bioassessment samples had CSCI scores below 0.79. The available information is insufficient to determine whether the waterbody/pollutant combination should be placed on the 303(d) List of impaired waters at this time. 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:

Line of Evidence (LOE) for Decision ID 151391, Benthic Community Effects	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

305746

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 519CR0018 to determine beneficial use support and the results are as follows: 1 of 1 samples exceeded the threshold. CSCI scores were from 0.473198616 to 0.473198616.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. Region 5 Basin Plan

Objective/Criterion Reference:

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 (Rehn, 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:

Samples were collected from station 519CR0018.

Temporal Representation:

Samples were collected from 8/7/2018 to 8/7/2018.

Environmental Conditions:

QAPP Information:

Data were collected using EPA National Rivers and Streams Assessment protocols

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 151391, Benthic Community Effects	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

305760

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 519CR0912 to determine beneficial use support and the results are as follows: 1 of 1 samples exceeded the threshold. CSCI scores were from 0.627652887 to 0.627652887.

Data Reference:

California Stream Condition Index (CSCI) Scores for the 2024 Integrated Report for Region 5, Sacramento River sub-region.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. Region 5 Basin Plan

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

Samples were collected from station 519CR0912.

Temporal Representation:

Samples were collected from 7/17/2013 to 7/17/2013.

Environmental Conditions:

QAPP Information:

Data were collected using Surface Water Ambient Monitoring Program protocols

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 151391, Benthic Community Effects	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

305763

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 519FCA067 to determine beneficial use support and the results are as follows: 0 of 1 samples exceeded the threshold. CSCI scores were from 0.834242855 to 0.834242855.

Data Reference:

California Stream Condition Index (CSCI) Scores for the 2024 Integrated Report for Region 5, Sacramento River sub-region.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. Region 5 Basin Plan

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

Samples were collected from station 519FCA067.

Temporal Representation:

Samples were collected from 9/9/2008 to 9/9/2008.

Environmental Conditions:

QAPP Information:

Data were collected using Surface Water Ambient Monitoring Program protocols

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.


DECISION ID	146121	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Benzene
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. 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:

Line of Evidence (LOE) for Decision ID 146121, Benzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297382

Pollutant:

Benzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Benzene.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for Benzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.001 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146121, Benzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293078

Pollutant:

Benzene

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:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzene criterion for the protection of human health from consumption of organisms only is 71 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146121, Benzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297381

Pollutant:

Benzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Benzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for Benzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.001 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146121, Benzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297488

Pollutant:

Benzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Benzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for Benzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.001 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146121, Benzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293186

Pollutant:

Benzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 Primary Maximum Contaminant Level for Benzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.001 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146121, Benzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297479

Pollutant:

Benzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Benzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzene criterion for the protection of human health from consumption of organisms only is 71 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146121, Benzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293083

Pollutant:

Benzene

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:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzene criterion for the protection of human health from consumption of organisms only is 71 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146121, Benzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297483

Pollutant:

Benzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Benzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for Benzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.001 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146121, Benzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297475

Pollutant:

Benzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Benzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzene criterion for the protection of human health from consumption of organisms only is 71 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146121, Benzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297485

Pollutant:

Benzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Benzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for Benzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.001 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146121, Benzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297478

Pollutant:

Benzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Benzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzene criterion for the protection of human health from consumption of organisms only is 71 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146121, Benzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297383

Pollutant:

Benzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Benzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for Benzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.001 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146121, Benzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297484

Pollutant:

Benzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Benzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzene criterion for the protection of human health from consumption of organisms only is 71 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146121, Benzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297481

Pollutant:

Benzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Benzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzene criterion for the protection of human health from consumption of organisms only is 71 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146121, Benzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297476

Pollutant:

Benzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Benzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzene criterion for the protection of human health from consumption of organisms only is 71 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146121, Benzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297480

Pollutant:

Benzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Benzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzene criterion for the protection of human health from consumption of organisms only is 71 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146121, Benzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293187

Pollutant:

Benzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 Primary Maximum Contaminant Level for Benzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.001 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146121, Benzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297486

Pollutant:

Benzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Benzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for Benzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.001 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146121, Benzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297482

Pollutant:

Benzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Benzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for Benzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.001 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146121, Benzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297477

Pollutant:

Benzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Benzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzene criterion for the protection of human health from consumption of organisms only is 71 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146121, Benzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297487

Pollutant:

Benzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Benzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzene criterion for the protection of human health from consumption of organisms only is 71 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146121, Benzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297380

Pollutant:

Benzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Benzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for Benzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.001 mg/L

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146122	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Benzidine
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.

Line of Evidence (LOE) for Decision ID 146122, Benzidine	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293081

Pollutant:

Benzidine

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 SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Benzidine. Although a total of 5 samples were collected, 5 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzidine criterion for the protection of human health from consumption of organisms only is 0.00054 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146122, Benzidine	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293142

Pollutant:

Benzidine

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 SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Benzidine. Although a total of 5 samples were collected, 5 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzidine criterion for the protection of human health from consumption of organisms only is 0.00054 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146122, Benzidine	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293141

Pollutant:

Benzidine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Benzidine. Although a total of 5 samples were collected, 5 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzidine criterion for the protection of human health from the consumption of water and organisms is 0.00012 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146122, Benzidine	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293143

Pollutant:

Benzidine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Benzidine. Although a total of 5 samples were collected, 5 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzidine criterion for the protection of human health from the consumption of water and organisms is 0.00012 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146124	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Benzo(a)anthracene
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. Six lines of evidence are available in the administrative record to assess this pollutant. Zero of 20 water samples exceed the criteria for COMM. Additionally, one of one water sample exceed the criteria for MUN and zero of eight sediment samples exceed the guideline for COLD. 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. Zero of 20 water samples exceed the criteria for COMM 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.

Line of Evidence (LOE) for Decision ID 146124, Benzo(a)anthracene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293124

Pollutant:

Benzo(a)anthracene

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:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzo(a)anthracene criterion for the protection of human health from consumption of organisms only is 0.049 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146124, Benzo(a)anthracene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297274

Pollutant:

Benzo(a)anthracene

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:

Evaluation Guideline:

The evaluation guideline for Benz[a]anthrazene from MacDonald et al., 2000a which states that the probable effect concentration for Benz[a]anthrazene is 1050 ug/kg. (dw = Dry Weight)

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-08-19 to 2017-08-01

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146124, Benzo(a)anthracene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293058

Pollutant:

Benzo(a)anthracene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 1 of the 1 samples exceeded the water quality threshold for Benz(a)anthracene. Although a total of 10 samples were collected, 9 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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzo(a)anthracene criterion for the protection of human health from the consumption of water and organisms is 0.0044 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Discovery).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-10-05 to 2015-02-07

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146124, Benzo(a)anthracene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293184

Pollutant:

Benzo(a)anthracene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Benz(a)anthracene. Although a total of 10 samples were collected, 10 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzo(a)anthracene criterion for the protection of human health from the consumption of water and organisms is 0.0044 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146124, Benzo(a)anthracene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293125

Pollutant:

Benzo(a)anthracene

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:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzo(a)anthracene criterion for the protection of human health from consumption of organisms only is 0.049 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2015-02-07

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 146124, Benzo(a)anthracene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59771

Pollutant:

Benzo(a)anthracene

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:

SWAMP data indicates that 0 of the sample results exceed the evaluation guideline value for Benzo(a)anthracene.

Data Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for Benzo(a)anthracene is 1050 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 was collected at one monitoring site [ American R @ Discovery Park - 519AMNDVY]

Temporal Representation:

Data was collected on 7/16/2008.

Environmental Conditions:

Staff is not 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	146123	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Benzo(a)pyrene
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. Six lines of evidence are available in the administrative record to assess this pollutant. Zero of 19 water samples exceed the criteria for COMM. One of one sample exceeds the criteria for MUN. Zero of eight sediment samples exceed the guideline for COLD> 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. Zero of 19 water samples exceed the criteria for COMM 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.

Line of Evidence (LOE) for Decision ID 146123, Benzo(a)pyrene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59772

Pollutant:

Benzo(a)pyrene

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:

SWAMP data indicates that 0 of the sample results exceed the evaluation guideline value for Benzo(a)pyrene.

Data Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments, the probable effect level (predictive of sediment toxicity) for Benzo(a)Pyrene is 1,450 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 was collected at one monitoring site [ American R @ Discovery Park - 519AMNDVY]

Temporal Representation:

Data was collected on 7/16/2008.

Environmental Conditions:

Staff is not 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 146123, Benzo(a)pyrene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297275

Pollutant:

Benzo(a)pyrene

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:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Benzo[a]pyrene from MacDonald et al., 2000a which states that the probable effect concentration for Benzo[a]pyrene is 1450 ug/kg. (dw = Dry Weight)

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-08-19 to 2017-08-01

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146123, Benzo(a)pyrene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293600

Pollutant:

Benzo(a)pyrene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Benzo(a)pyrene. Although a total of 11 samples were collected, 11 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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The benzo(a)pyrene criterion for the protection of human health from the consumption of water and organisms is 0.0044 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-24 to 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146123, Benzo(a)pyrene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293580

Pollutant:

Benzo(a)pyrene

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 SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 9 samples exceeded the water quality threshold for Benzo(a)pyrene. Although a total of 10 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The benzo(a)byrene criterion for the protection of human health from consumption of organisms only is 0.049 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Discovery).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-10-24 to 2015-02-07

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146123, Benzo(a)pyrene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293598

Pollutant:

Benzo(a)pyrene

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 SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support and the results are as follows: 0 of the 10 samples exceeded the water quality threshold for Benzo(a)pyrene. Although a total of 11 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The benzo(a)byrene criterion for the protection of human health from consumption of organisms only is 0.049 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Nimbus).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-10-24 to 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146123, Benzo(a)pyrene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293145

Pollutant:

Benzo(a)pyrene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 1 of the 1 samples exceeded the water quality threshold for Benzo(a)pyrene. Although a total of 10 samples were collected, 9 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The benzo(a)pyrene criterion for the protection of human health from the consumption of water and organisms is 0.0044 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Discovery).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-10-24 to 2015-02-07

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146126	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Benzo[k]fluoranthene
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. Four lines of evidence are available in the administrative record to assess this pollutant. Zero of 21 samples exceed the criteria for COMM. One of one sample exceeds the criteria for MUN. 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. Zero of 21 samples exceed the criteria for COMM 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:

Line of Evidence (LOE) for Decision ID 146126, Benzo[k]fluoranthene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293423

Pollutant:

Benzo[k]fluoranthene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 1 of the 1 samples exceeded the water quality threshold for Benzo(k)fluoranthene. Although a total of 10 samples were collected, 9 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzo(k)Fluoranthene criterion for the protection of human health from the consumption of water and organisms is 0.0044 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Discovery).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-10-05 to 2015-02-07

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146126, Benzo[k]fluoranthene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293487

Pollutant:

Benzo[k]fluoranthene

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:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzo(k)Fluoranthene criterion for the protection of human health from consumption of organisms only is 0.049 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2015-02-07

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146126, Benzo[k]fluoranthene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293484

Pollutant:

Benzo[k]fluoranthene

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 SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Benzo(k)fluoranthene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzo(k)Fluoranthene criterion for the protection of human health from consumption of organisms only is 0.049 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146126, Benzo[k]fluoranthene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293466

Pollutant:

Benzo[k]fluoranthene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Benzo(k)fluoranthene. Although a total of 11 samples were collected, 11 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Benzo(k)Fluoranthene criterion for the protection of human health from the consumption of water and organisms is 0.0044 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146117	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Bis(2-chloroisopropyl) ether
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.

Line of Evidence (LOE) for Decision ID 146117, Bis(2-chloroisopropyl) ether	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293301

Pollutant:

Bis(2-chloroisopropyl) ether

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:

Non-SWAMP

Water Quality Objective/Criterion:

The bis(2-chloroisopropyl)ether criteria for the protection of human health from consumption of organisms only is 170,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146117, Bis(2-chloroisopropyl) ether	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293283

Pollutant:

Bis(2-chloroisopropyl) ether

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:

Non-SWAMP

Water Quality Objective/Criterion:

The bis(2-chloroisopropyl)ether criteria for the protection of human health from consumption of organisms only is 170,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146127	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Bis(2ethylhexyl)phthalate (DEHP)
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.

Line of Evidence (LOE) for Decision ID 146127, Bis(2ethylhexyl)phthalate (DEHP)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293571

Pollutant:

Bis(2ethylhexyl)phthalate (DEHP)

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:

Non-SWAMP

Water Quality Objective/Criterion:

The bis(2-Ethylhexyl)phthalate criteria for the protection of human health from consumption of organisms only is 5.9 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2010-10-24

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146127, Bis(2ethylhexyl)phthalate (DEHP)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293570

Pollutant:

Bis(2ethylhexyl)phthalate (DEHP)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 bis(2-Ethylhexyl)phthalate criteria for the protection of human health from the consumption of water and organisms is 1.8 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2010-10-24

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQX data for the 2020/2022 integrated report in Region 5.


DECISION ID	134688	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Boron
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. One line of evidence is available in the administrative record to assess this pollutant. One of the 63 samples exceed the criteria for Agricultural Supply. 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 63 samples exceeded the criteria agricultural supply 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:	Decision written by SWRCB staff.

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 applicable water quality standards for the pollutant are not exceeded.

Line of Evidence (LOE) for Decision ID 134688, Boron	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

241481

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses.

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:

The samples were collected at 1 monitoring site (CALWR_WQX-A0714010)

Temporal Representation:

The samples were collected between the dates of 2010-09-08 and 2016-04-04

Environmental Conditions:

QAPP Information:

STORET

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.


DECISION ID	134689	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Bromoform
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. 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 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.

Line of Evidence (LOE) for Decision ID 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297473

Pollutant:

Bromoform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Bromoform.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bromoform criterion for the protection of human health from consumption of organisms only is 360 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293324

Pollutant:

Bromoform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 bromoform criterion for the protection of human health from the consumption of water and organisms is 4.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297468

Pollutant:

Bromoform

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Bromoform.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bromoform criterion for the protection of human health from the consumption of water and organisms is 4.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297454

Pollutant:

Bromoform

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Bromoform.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bromoform criterion for the protection of human health from the consumption of water and organisms is 4.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297458

Pollutant:

Bromoform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Bromoform.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bromoform criterion for the protection of human health from consumption of organisms only is 360 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2017-06-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297466

Pollutant:

Bromoform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Bromoform.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bromoform criterion for the protection of human health from consumption of organisms only is 360 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297462

Pollutant:

Bromoform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Bromoform.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bromoform criterion for the protection of human health from consumption of organisms only is 360 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297459

Pollutant:

Bromoform

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Bromoform.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bromoform criterion for the protection of human health from the consumption of water and organisms is 4.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297465

Pollutant:

Bromoform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Bromoform.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bromoform criterion for the protection of human health from consumption of organisms only is 360 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297467

Pollutant:

Bromoform

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Bromoform.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bromoform criterion for the protection of human health from the consumption of water and organisms is 4.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2017-06-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293307

Pollutant:

Bromoform

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:

Non-SWAMP

Water Quality Objective/Criterion:

The bromoform criterion for the protection of human health from consumption of organisms only is 360 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293325

Pollutant:

Bromoform

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:

Non-SWAMP

Water Quality Objective/Criterion:

The bromoform criterion for the protection of human health from consumption of organisms only is 360 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297469

Pollutant:

Bromoform

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Bromoform.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bromoform criterion for the protection of human health from the consumption of water and organisms is 4.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297456

Pollutant:

Bromoform

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Bromoform.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bromoform criterion for the protection of human health from the consumption of water and organisms is 4.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297453

Pollutant:

Bromoform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Bromoform.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bromoform criterion for the protection of human health from consumption of organisms only is 360 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297455

Pollutant:

Bromoform

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Bromoform.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bromoform criterion for the protection of human health from the consumption of water and organisms is 4.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297460

Pollutant:

Bromoform

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Bromoform.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bromoform criterion for the protection of human health from the consumption of water and organisms is 4.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297463

Pollutant:

Bromoform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Bromoform.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bromoform criterion for the protection of human health from consumption of organisms only is 360 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293323

Pollutant:

Bromoform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 bromoform criterion for the protection of human health from the consumption of water and organisms is 4.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297474

Pollutant:

Bromoform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Bromoform.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bromoform criterion for the protection of human health from consumption of organisms only is 360 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQX data for the 2020/2022 integrated report in Region 5.

Line of Evidence (LOE) for Decision ID 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

241222

Pollutant:

Bromoform

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 STORET data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Bromoform.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Bromoform criteria for the protection of human health from consumption of organisms only is 360 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (CALWR_WQX-A0714010)

Temporal Representation:

The samples were collected between the dates of 2010-10-04 and 2011-09-06

Environmental Conditions:

QAPP Information:

STORET

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 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

241191

Pollutant:

Bromoform

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 STORET data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Bromoform.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Bromoform criteria for the protection of human health from the consumption of water and organisms is 4.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (CALWR_WQX-A0714010)

Temporal Representation:

The samples were collected between the dates of 2010-10-04 and 2011-09-06

Environmental Conditions:

QAPP Information:

STORET

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 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297464

Pollutant:

Bromoform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Bromoform.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bromoform criterion for the protection of human health from consumption of organisms only is 360 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134689, Bromoform	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297461

Pollutant:

Bromoform

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Bromoform.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bromoform criterion for the protection of human health from the consumption of water and organisms is 4.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):


DECISION ID	146129	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

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:	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.

Line of Evidence (LOE) for Decision ID 146129, Cadmium	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59791

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:

SWAMP data indicates that 0 of the sample results exceed the evaluation guideline value for Cadmium.

Data Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

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 was collected at one monitoring site [ American R @ Discovery Park - 519AMNDVY]

Temporal Representation:

Data was collected on 7/16/2008.

Environmental Conditions:

Staff is not 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 146129, Cadmium	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297245

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:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Cadmium from MacDonald et al., 2000a which states that the probable effect concentration for Cadmium is 4.98 mg/kg. (dw = Dry Weight)

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-08-19 to 2018-07-09

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146129, Cadmium	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293349

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:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for cadmium incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146129, Cadmium	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293425

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:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for cadmium incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146129, Cadmium	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297391

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for cadmium incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2020-04-24 and 2020-04-24

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146129, Cadmium	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297390

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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:

Non-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: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2020-04-24 and 2020-04-24

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146129, Cadmium	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293406

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:

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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146129, Cadmium	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293390

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:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for cadmium incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146129, Cadmium	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293389

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:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for cadmium incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.005 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146129, Cadmium	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293366

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:

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: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146130	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Carbaryl
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:

Line of Evidence (LOE) for Decision ID 146130, Carbaryl	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293451

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:

Data Reference:

SWAMP Data:

Non-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:

Evaluation Guideline:

The USEPA recommended water quality criterion for freshwater aquatic life for carbaryl is 2.1 Âµg/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146130, Carbaryl	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293473

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:

Data Reference:

SWAMP Data:

Non-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:

Evaluation Guideline:

The USEPA recommended water quality criterion for freshwater aquatic life for carbaryl is 2.1 Âµg/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146247	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

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.

Line of Evidence (LOE) for Decision ID 146247, Carbendazim	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

291878

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:

Water Board staff assessed USGS California Water Science Center data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Carbendazim.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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: USGS-383609121293200 (AMERICAN R 1 MI AB MOUTH CA).

Temporal Representation:

The samples were collected between the dates of 2016-10-26 and 2016-10-26

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):


DECISION ID	146131	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

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:	This decision was made by SWRCB staff.

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.

Line of Evidence (LOE) for Decision ID 146131, Carbofuran	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293511

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:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for Carbofuran incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.018 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146131, Carbofuran	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

307381

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 SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Carbofuran. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The interim water quality criterion for the protection of sensitive aquatic organisms from Carbofuran is 0.5 ug/l (DFG 92-3, 1992).

Guideline Reference:

Hazard Assessment of the Insecticide Carbofuran to Aquatic Organisms in the Sacramento River System

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-10-05 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146131, Carbofuran	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

307377

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 SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Carbofuran. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The interim water quality criterion for the protection of sensitive aquatic organisms from Carbofuran is 0.5 ug/l (DFG 92-3, 1992).

Guideline Reference:

Hazard Assessment of the Insecticide Carbofuran to Aquatic Organisms in the Sacramento River System

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-10-05 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146131, Carbofuran	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293490

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:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for Carbofuran incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.018 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146132	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Carbon tetrachloride
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. 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:

Line of Evidence (LOE) for Decision ID 146132, Carbon tetrachloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297413

Pollutant:

Carbon tetrachloride

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Carbon Tetrachloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The carbon tetrachloride criterion for the protection of human health from the consumption of water and organisms is 0.25 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146132, Carbon tetrachloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293553

Pollutant:

Carbon tetrachloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Carbon Tetrachloride. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The carbon tetrachloride criterion for the protection of human health from the consumption of water and organisms is 0.25 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146132, Carbon tetrachloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297402

Pollutant:

Carbon tetrachloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Carbon Tetrachloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The carbon tetrachloride criterion for the protection of human health from consumption of organisms only is 4.4 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146132, Carbon tetrachloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297394

Pollutant:

Carbon tetrachloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Carbon Tetrachloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The carbon tetrachloride criterion for the protection of human health from consumption of organisms only is 4.4 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146132, Carbon tetrachloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297404

Pollutant:

Carbon tetrachloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Carbon Tetrachloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The carbon tetrachloride criterion for the protection of human health from consumption of organisms only is 4.4 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146132, Carbon tetrachloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297395

Pollutant:

Carbon tetrachloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Carbon Tetrachloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The carbon tetrachloride criterion for the protection of human health from consumption of organisms only is 4.4 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146132, Carbon tetrachloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297411

Pollutant:

Carbon tetrachloride

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Carbon Tetrachloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The carbon tetrachloride criterion for the protection of human health from the consumption of water and organisms is 0.25 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146132, Carbon tetrachloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297405

Pollutant:

Carbon tetrachloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Carbon Tetrachloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The carbon tetrachloride criterion for the protection of human health from consumption of organisms only is 4.4 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146132, Carbon tetrachloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297393

Pollutant:

Carbon tetrachloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Carbon Tetrachloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The carbon tetrachloride criterion for the protection of human health from consumption of organisms only is 4.4 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146132, Carbon tetrachloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297392

Pollutant:

Carbon tetrachloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Carbon Tetrachloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The carbon tetrachloride criterion for the protection of human health from consumption of organisms only is 4.4 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146132, Carbon tetrachloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293552

Pollutant:

Carbon tetrachloride

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:

Non-SWAMP

Water Quality Objective/Criterion:

The carbon tetrachloride criterion for the protection of human health from consumption of organisms only is 4.4 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146132, Carbon tetrachloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293309

Pollutant:

Carbon tetrachloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Carbon Tetrachloride. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The carbon tetrachloride criterion for the protection of human health from the consumption of water and organisms is 0.25 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146132, Carbon tetrachloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297410

Pollutant:

Carbon tetrachloride

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Carbon Tetrachloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The carbon tetrachloride criterion for the protection of human health from the consumption of water and organisms is 0.25 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146132, Carbon tetrachloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297409

Pollutant:

Carbon tetrachloride

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Carbon Tetrachloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The carbon tetrachloride criterion for the protection of human health from the consumption of water and organisms is 0.25 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146132, Carbon tetrachloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297412

Pollutant:

Carbon tetrachloride

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Carbon Tetrachloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The carbon tetrachloride criterion for the protection of human health from the consumption of water and organisms is 0.25 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146132, Carbon tetrachloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297407

Pollutant:

Carbon tetrachloride

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Carbon Tetrachloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The carbon tetrachloride criterion for the protection of human health from the consumption of water and organisms is 0.25 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146132, Carbon tetrachloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297415

Pollutant:

Carbon tetrachloride

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Carbon Tetrachloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The carbon tetrachloride criterion for the protection of human health from the consumption of water and organisms is 0.25 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146132, Carbon tetrachloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297414

Pollutant:

Carbon tetrachloride

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Carbon Tetrachloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The carbon tetrachloride criterion for the protection of human health from the consumption of water and organisms is 0.25 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146132, Carbon tetrachloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297408

Pollutant:

Carbon tetrachloride

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Carbon Tetrachloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The carbon tetrachloride criterion for the protection of human health from the consumption of water and organisms is 0.25 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146132, Carbon tetrachloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293555

Pollutant:

Carbon tetrachloride

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:

Non-SWAMP

Water Quality Objective/Criterion:

The carbon tetrachloride criterion for the protection of human health from consumption of organisms only is 4.4 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146132, Carbon tetrachloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297403

Pollutant:

Carbon tetrachloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Carbon Tetrachloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The carbon tetrachloride criterion for the protection of human health from consumption of organisms only is 4.4 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146132, Carbon tetrachloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297406

Pollutant:

Carbon tetrachloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Carbon Tetrachloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The carbon tetrachloride criterion for the protection of human health from consumption of organisms only is 4.4 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

Habitat, Tissue data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146133	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Chlordane
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.

Line of Evidence (LOE) for Decision ID 146133, Chlordane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297177

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:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146133, Chlordane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296969

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 SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Total Chlordane. 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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-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:

Evaluation Guideline:

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).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-10-05 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146133, Chlordane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296921

Pollutant:

Chlordane

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 SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Total Chlordane. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlordane 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: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-10-05 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Sacramento River Watershed Program Annual Reports for 1999-2000, 2000-2001, 2001-2002, 2002-2003, and 2003-2004; and BDAT data 1998-2003

Line of Evidence (LOE) for Decision ID 146133, Chlordane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

25889

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish whole body

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fish tissue analysis

Data Used to Assess Water Quality:

Four composite fish tissue samples were each analyzed for nine forms of chlordane, including: cis-Chlordane, trans-Chlordane, alpha-Chlordene, gamma-Chlordene, Heptachlor, Heptachlor epoxide, cis-Nonachlor, trans-Nonachlor and Oxychlordane.
The four composite fish tissue samples were Sacramento Sucker (captured from the American River at Discovery Park on 18 October 2005), White Catfish (captured from the American River at Discovery Park on 26 July 2005, Rainbow Trout (captured from the American River at the American River Hatchery on 21 September 2005, and Sacramento Sucker (captured from the American River at Nimbus Dam on 27 September, 2005.
Only the composite fish tissue sample of Sacramento Sucker captured from the American River at Discovery Park exceeded the OEHHA screening value of 5.6 ug/kg for chlordane in fish tissue, and had a total chlordane concentration of 18.84 ug/kg.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

Evaluation Guideline:

OEHHA 2008 Fish Contaminant Goals (FCG) are based on cancer risk assessments using an 8-Ounce/Week (prior to cooking) consumption rate of 32 g/day. The FCG used as a screening value for total chlordane (with a cancer slope factor of 1.3 mg/kg/day) should be less than 5.6 ug/kg.

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:

Samples were collected from the lower American River at: Discovery Park (Sacramento Sucker and White Catfish); at the American River Hatchery (Rainbow Trout); and at Nimbus Dam (Sacramento Sucker).

Temporal Representation:

Sacramento Sucker were captured from the American River at Discovery Park on 18 October 2005; White Catfish were captured from the American River at Discovery Park on 26 July 2005; Rainbow Trout were captured from the American River Hatchery on 21 September 2005; and Sacramento Sucker were captured from the American RIver at Nimbus Dam on 27 September, 2005.

Environmental Conditions:

QAPP Information:

Data Quality: Good. Monitoring was conducted in accordance with Sacramento River Watershed Program QAPP requirements.

QAPP Information Reference(s):

Quality Assurance Project Plans prepared for Sacramento River Watershed Program

Line of Evidence (LOE) for Decision ID 146133, Chlordane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59803

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 exceeded the criteria for chlordane concentration (Sum of trans-Chlordane, cis-Chlordane, cis-Nonachlor, trans-Nonachlor, and Oxychlordane).

Data Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. Waters shall not contain substances in concentrations that result in the deposition of material that causes nuisance or adversely affects beneficial uses. (Water Quality Control Plan for the Sacramento and San Joaquin River Basins).

Objective/Criterion Reference:

Evaluation Guideline:

The Probable Effect Concentration for Chlordane in freshwater sediments is 17.6 ug/kg(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 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

The samples were collected on 7/16/2008.

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 146133, Chlordane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296955

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 SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Total Chlordane. 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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-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: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-10-05 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146133, Chlordane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296774

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 SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Total Chlordane. 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:

SWAMP Data:

Non-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: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-10-05 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Habitat, Tissue data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146133, Chlordane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297176

Pollutant:

Chlordane

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:

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146133, Chlordane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297246

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:

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for chlordane is the probable effect concentration (PEC) of 17.6 ug/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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-08-19 to 2017-08-01

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146133, Chlordane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296867

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 SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Total Chlordane. 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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-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:

Evaluation Guideline:

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).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-10-05 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146133, Chlordane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

296883

Pollutant:

Chlordane

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 SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Total Chlordane. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlordane 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: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-10-05 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	134690	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

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)(2020)
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. During the 2024 Cycle LOEs were updated due to a reassessment of data based on the Central Valley Water Board CV-SALTS Secondary MCL 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:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 134690, Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

311577

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the upper limit of the range for Chloride. Additionally, 0 of the 6 samples fall within the range, and 6 of 6 samples fall below the threshold.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for chloride of 250 - 500 mg/L assessed as an annual average.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-12-06 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQX data for the 2020/2022 integrated report in Region 5.

Line of Evidence (LOE) for Decision ID 134690, Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

312617

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 STORET data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the upper limit of the range for Chloride. Additionally, 0 of the 7 samples fall within the range, and 7 of 7 samples fall below the threshold.

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: CALWR_WQX-A0714010 (American River at W.T.P).

Temporal Representation:

The samples were collected between the dates of 2010-12-06 and 2016-04-04

Environmental Conditions:

QAPP Information:

STORET

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 134690, Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

311895

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 DFW_ABL_Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the upper limit of the range for Chloride. Additionally, 0 of the 1 samples fall within the range, and 1 of 1 samples fall below the threshold.

Data Reference:

Habitat, Water data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 519CR0912 (American River -0912).

Temporal Representation:

The samples were collected between the dates of 2013-07-17 and 2013-07-17

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 134690, Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

311503

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the upper limit of the range for Chloride. Additionally, 0 of the 6 samples fall within the range, and 6 of 6 samples fall below the threshold.

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-12-06 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134690, Chloride	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

313108

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:

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: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2019-10-17 and 2020-07-23

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146134	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Chlorobenzene (mono)
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. 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:

Line of Evidence (LOE) for Decision ID 146134, Chlorobenzene (mono)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297428

Pollutant:

Chlorobenzene (mono)

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Chlorobenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for chlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.07 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146134, Chlorobenzene (mono)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297430

Pollutant:

Chlorobenzene (mono)

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Chlorobenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for chlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.07 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146134, Chlorobenzene (mono)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297578

Pollutant:

Chlorobenzene (mono)

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Chlorobenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for chlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.07 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146134, Chlorobenzene (mono)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293332

Pollutant:

Chlorobenzene (mono)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 Primary Maximum Contaminant Level for chlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.07 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146134, Chlorobenzene (mono)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297397

Pollutant:

Chlorobenzene (mono)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Chlorobenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorobenzene criterion for the protection of human health from consumption of organisms only is 21,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146134, Chlorobenzene (mono)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297398

Pollutant:

Chlorobenzene (mono)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Chlorobenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorobenzene criterion for the protection of human health from consumption of organisms only is 21,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146134, Chlorobenzene (mono)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297396

Pollutant:

Chlorobenzene (mono)

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Chlorobenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for chlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.07 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146134, Chlorobenzene (mono)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297401

Pollutant:

Chlorobenzene (mono)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Chlorobenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorobenzene criterion for the protection of human health from consumption of organisms only is 21,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146134, Chlorobenzene (mono)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293313

Pollutant:

Chlorobenzene (mono)

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:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorobenzene criterion for the protection of human health from consumption of organisms only is 21,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146134, Chlorobenzene (mono)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293334

Pollutant:

Chlorobenzene (mono)

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:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorobenzene criterion for the protection of human health from consumption of organisms only is 21,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146134, Chlorobenzene (mono)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297418

Pollutant:

Chlorobenzene (mono)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Chlorobenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorobenzene criterion for the protection of human health from consumption of organisms only is 21,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146134, Chlorobenzene (mono)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297421

Pollutant:

Chlorobenzene (mono)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Chlorobenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorobenzene criterion for the protection of human health from consumption of organisms only is 21,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146134, Chlorobenzene (mono)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297427

Pollutant:

Chlorobenzene (mono)

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Chlorobenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for chlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.07 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146134, Chlorobenzene (mono)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297583

Pollutant:

Chlorobenzene (mono)

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Chlorobenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for chlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.07 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146134, Chlorobenzene (mono)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297400

Pollutant:

Chlorobenzene (mono)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Chlorobenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorobenzene criterion for the protection of human health from consumption of organisms only is 21,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146134, Chlorobenzene (mono)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297399

Pollutant:

Chlorobenzene (mono)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Chlorobenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorobenzene criterion for the protection of human health from consumption of organisms only is 21,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146134, Chlorobenzene (mono)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293331

Pollutant:

Chlorobenzene (mono)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 Primary Maximum Contaminant Level for chlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.07 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146134, Chlorobenzene (mono)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297582

Pollutant:

Chlorobenzene (mono)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Chlorobenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorobenzene criterion for the protection of human health from consumption of organisms only is 21,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146134, Chlorobenzene (mono)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297580

Pollutant:

Chlorobenzene (mono)

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Chlorobenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for chlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.07 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146134, Chlorobenzene (mono)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297422

Pollutant:

Chlorobenzene (mono)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Chlorobenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorobenzene criterion for the protection of human health from consumption of organisms only is 21,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146134, Chlorobenzene (mono)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297429

Pollutant:

Chlorobenzene (mono)

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Chlorobenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for chlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.07 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146134, Chlorobenzene (mono)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297579

Pollutant:

Chlorobenzene (mono)

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Chlorobenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for chlorobenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.07 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.


DECISION ID	134691	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Chlorodibromomethane
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. 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 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 applicable water quality standards for the pollutant are not exceeded.

Line of Evidence (LOE) for Decision ID 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297565

Pollutant:

Chlorodibromomethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Dibromochloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorodibromomethane criterion for the protection of human health from the consumption of water and organisms is 0.41 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297568

Pollutant:

Chlorodibromomethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dibromochloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorodibromomethane criterion for the protection of human health from the consumption of water and organisms is 0.41 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293790

Pollutant:

Chlorodibromomethane

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:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorodibromomethane criterion for the protection of human health from consumption of organisms only is 34 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297563

Pollutant:

Chlorodibromomethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dibromochloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorodibromomethane criterion for the protection of human health from the consumption of water and organisms is 0.41 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297556

Pollutant:

Chlorodibromomethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dibromochloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorodibromomethane criterion for the protection of human health from consumption of organisms only is 34 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297562

Pollutant:

Chlorodibromomethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dibromochloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorodibromomethane criterion for the protection of human health from consumption of organisms only is 34 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293732

Pollutant:

Chlorodibromomethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dibromochloromethane. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorodibromomethane criterion for the protection of human health from the consumption of water and organisms is 0.41 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQX data for the 2020/2022 integrated report in Region 5.

Line of Evidence (LOE) for Decision ID 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

241163

Pollutant:

Chlorodibromomethane

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 STORET data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Bromodichloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Dichlorobromomethane criteria for the protection of human health from consumption of organisms only is 46 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (CALWR_WQX-A0714010)

Temporal Representation:

The samples were collected between the dates of 2010-10-04 and 2011-09-06

Environmental Conditions:

QAPP Information:

STORET

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 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

241819

Pollutant:

Chlorodibromomethane

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 STORET data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Dibromochloromethane.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Chlorodibromomethane criteria for the protection of human health from consumption of organisms only is 34 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (CALWR_WQX-A0714010)

Temporal Representation:

The samples were collected between the dates of 2010-10-04 and 2011-09-06

Environmental Conditions:

QAPP Information:

STORET

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 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

241164

Pollutant:

Chlorodibromomethane

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 STORET data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Bromodichloromethane.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Dichlorobromomethane criteria for the protection of human health from the consumption of water and organisms is 0.56 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (CALWR_WQX-A0714010)

Temporal Representation:

The samples were collected between the dates of 2010-10-04 and 2011-09-06

Environmental Conditions:

QAPP Information:

STORET

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 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

241821

Pollutant:

Chlorodibromomethane

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 STORET data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Dibromochloromethane.

Data Reference:

WQX data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Chlorodibromomethane criterion for the protection of human health from the consumption of water and organisms is 0.41 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (CALWR_WQX-A0714010)

Temporal Representation:

The samples were collected between the dates of 2010-10-04 and 2011-09-06

Environmental Conditions:

QAPP Information:

STORET

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 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297575

Pollutant:

Chlorodibromomethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dibromochloromethane.

Data Reference:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorodibromomethane criterion for the protection of human health from consumption of organisms only is 34 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297567

Pollutant:

Chlorodibromomethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dibromochloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorodibromomethane criterion for the protection of human health from the consumption of water and organisms is 0.41 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297566

Pollutant:

Chlorodibromomethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dibromochloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorodibromomethane criterion for the protection of human health from the consumption of water and organisms is 0.41 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297561

Pollutant:

Chlorodibromomethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dibromochloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorodibromomethane criterion for the protection of human health from consumption of organisms only is 34 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297555

Pollutant:

Chlorodibromomethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dibromochloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorodibromomethane criterion for the protection of human health from consumption of organisms only is 34 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297570

Pollutant:

Chlorodibromomethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Dibromochloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorodibromomethane criterion for the protection of human health from the consumption of water and organisms is 0.41 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297554

Pollutant:

Chlorodibromomethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Dibromochloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorodibromomethane criterion for the protection of human health from consumption of organisms only is 34 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297552

Pollutant:

Chlorodibromomethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dibromochloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorodibromomethane criterion for the protection of human health from consumption of organisms only is 34 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297553

Pollutant:

Chlorodibromomethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Dibromochloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorodibromomethane criterion for the protection of human health from consumption of organisms only is 34 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297573

Pollutant:

Chlorodibromomethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dibromochloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorodibromomethane criterion for the protection of human health from the consumption of water and organisms is 0.41 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297572

Pollutant:

Chlorodibromomethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dibromochloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorodibromomethane criterion for the protection of human health from the consumption of water and organisms is 0.41 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293789

Pollutant:

Chlorodibromomethane

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:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorodibromomethane criterion for the protection of human health from consumption of organisms only is 34 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297571

Pollutant:

Chlorodibromomethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Dibromochloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorodibromomethane criterion for the protection of human health from consumption of organisms only is 34 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293788

Pollutant:

Chlorodibromomethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dibromochloromethane. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorodibromomethane criterion for the protection of human health from the consumption of water and organisms is 0.41 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 134691, Chlorodibromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297564

Pollutant:

Chlorodibromomethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Dibromochloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The chlorodibromomethane criterion for the protection of human health from the consumption of water and organisms is 0.41 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

Data for Various Pollutants in American River, 2009-2010.


DECISION ID	146135	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

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. 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.

Line of Evidence (LOE) for Decision ID 146135, Chlorpyrifos	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59805

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:

A total of 35 individual whole water samples were collected resulting in 26 four-day average data points; 0 of the 26 four-day average data points exceeded the California Department of Fish and Game Hazard Assessment 4-day average criteria of 0.015 µg/L.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

Evaluation Guideline:

California Department of Fish and Game Hazard Assessment Criteria - 0.015 ug/L 4-day average and 0.025 ug/L 1-hour average (Siepmann and Finlayson, 2000, with minor corrections to significant figures as described in Beaulaurier et al., 2005).

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:

Samples were collected along the bank of the American River at Sunrise Blvd, Howe Avenue and Discovery Park.

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 146135, Chlorpyrifos	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293536

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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-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:

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:

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:

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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2011-02-16 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146135, Chlorpyrifos	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293518

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality threshold for Chlorpyrifos.

Data Reference:

SWAMP Data:

Non-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:

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: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2011-04-19 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146135, Chlorpyrifos	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297256

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:

Water Board staff assessed SWAMP Stream Pollution Trends data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for Chlorpyrifos. Although a total of 4 samples were collected, 2 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:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for chlorpyrifos, 0.177 ug/g, is one-tenth of the median lethal concentration (LC50; 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 were collected from 1 station(s). Station Code(s): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-08-19 to 2015-08-18

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146135, Chlorpyrifos	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59804

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 for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline value for chlorpyrifos, 0.177 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 1.77 ug/g OC). The LC50 (1.77 ug/g OC) is the geometric mean of OC-normalized LC50 values for chlorpyrifos from 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 was collected at one monitoring site [ American R @ Discovery Park - 519AMNDVY]

Temporal Representation:

Data was collected on 7/16/2008.

Environmental Conditions:

Staff is not 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	146237	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

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:	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.

Line of Evidence (LOE) for Decision ID 146237, Chromium	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297548

Pollutant:

Chromium

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:

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for total chromium incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.05 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2019-10-17 and 2020-04-24

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146237, Chromium	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297547

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

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 dissolved chromium (III) criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is is hardness dependent as described in Table 1 of paragraph (b)(1). The value calculated when using a default hardness of 100 mg/L is 180 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2019-10-17 and 2020-04-24

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146237, Chromium	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293290

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:

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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146237, Chromium	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293294

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for total chromium incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.05 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146237, Chromium	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293559

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for total chromium incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.05 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146237, Chromium	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293314

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for total chromium incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.05 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 146237, Chromium	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59806

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:

SWAMP data indicates that the sample result exceeds the evaluation guideline value for Chromium.

Data Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

SWAMP Data:

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 was collected at one monitoring site [ American R @ Discovery Park - 519AMNDVY]

Temporal Representation:

Data was collected on 7/16/2008.

Environmental Conditions:

Staff is not 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 146237, Chromium	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293557

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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

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: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146237, Chromium	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293574

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for total chromium incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.05 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146237, Chromium	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297257

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:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Chromium from MacDonald et al., 2000a which states that the probable effect concentration for Chromium is 111 mg/kg. (dw = Dry Weight)

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-08-19 to 2018-07-09

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.


DECISION ID	146138	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Copper
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.

Line of Evidence (LOE) for Decision ID 146138, Copper	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59817

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:

SWAMP data indicates that 0 of the sample results exceed the evaluation guideline value for Copper.

Data Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

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 was collected at one monitoring site [ American R @ Discovery Park - 519AMNDVY]

Temporal Representation:

Data was collected on 7/16/2008.

Environmental Conditions:

Staff is not 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 146138, Copper	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

303823

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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Basin Plan objective for copper in this water body is 0.01 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Discovery)

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146138, Copper	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

303822

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:

The Basin Plan objective for copper in this water body is 0.01 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Discovery)

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146138, Copper	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297262

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:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Copper from MacDonald et al., 2000a which states that the probable effect concentration for Copper is 149 mg/kg. (dw = Dry Weight)

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-08-19 to 2018-07-09

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.


DECISION ID	146228	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Cypermethrin
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)(2020)
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.

Line of Evidence (LOE) for Decision ID 146228, Cypermethrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59831

Pollutant:

Cypermethrin

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 for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline value for cypermethrin, 0.03 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 0.3 ug/g OC). The LC50 is the geometric mean of OC-normalized 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 was collected at one monitoring site [ American R @ Discovery Park - 519AMNDVY]

Temporal Representation:

Data was collected on 7/16/2008.

Environmental Conditions:

Staff is not 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 146228, Cypermethrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

188039

Pollutant:

Cypermethrin

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 RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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 2 samples were collected, 2 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:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

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:

Evaluation Guideline:

The chronic concentration goal 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:

Amendment to the Water Quality Control Plan for the Sacramento River and San Joaquin River Basins for the Control of Pyrethroid Pesticide Discharges

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (519LSAC53).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-12-18 to 2010-12-19

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 146228, Cypermethrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

188040

Pollutant:

Cypermethrin

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 RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 1 of the 1 samples exceeded the water quality threshold for Cypermethrin. Although a total of 2 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:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

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:

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

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (519SAC126).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-12-18 to 2010-12-19

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 146228, Cypermethrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

188041

Pollutant:

Cypermethrin

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 RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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 2 samples were collected, 2 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:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

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:

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

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (519SAC111).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-12-16 to 2010-12-19

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 146228, Cypermethrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293906

Pollutant:

Cypermethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the water quality threshold for Cypermethrin. Although a total of 15 samples were collected, 14 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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-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:

Evaluation Guideline:

The chronic concentration goal for cypermethrin is 0.3 ng/LÂ (expressed as a 4-day average).Â If the freely dissolved concentrations of Cypermethrin were reported or could be calculated then these values were used for this assessment.Â 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

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Discovery).

Temporal Representation:

Data for this waterbody was collected over the date range 2011-04-19 to 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146228, Cypermethrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293888

Pollutant:

Cypermethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support and the results are as follows: 1 of the 1 samples exceeded the water quality threshold for Cypermethrin. Although a total of 14 samples were collected, 13 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:

SWAMP Data:

Non-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:

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

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Nimbus).

Temporal Representation:

Data for this waterbody was collected over the date range 2011-04-19 to 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146228, Cypermethrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297235

Pollutant:

Cypermethrin

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:

Water Board staff assessed SWAMP Stream Pollution Trends data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cypermethrin, Total. Although a total of 6 samples were collected, 6 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:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for cypermethrin, 0.03 ug/g, is one-tenth of the median lethal concentration (LC50; 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 were collected from 1 station(s). Station Code(s): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Date for this waterbody were collected over the date range 2011-08-19 to 2016-07-27

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146228, Cypermethrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293872

Pollutant:

Cypermethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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 2 samples were collected, 2 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:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

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:

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

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-12-16 to 2010-12-19

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146228, Cypermethrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

214892

Pollutant:

Cypermethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 0 samples exceeded the water quality threshold for Cypermethrin.

Data Reference:

Data for Various Pollutants in American River, 2009-2010.

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:

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

Guideline Reference:

Spatial Representation:

Samples were collected along the bank of the American River at Sunrise Blvd, Howe Avenue and Discovery Park.

Temporal Representation:

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan


DECISION ID	150203	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

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)(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.

Line of Evidence (LOE) for Decision ID 150203, DDD (Dichlorodiphenyldichloroethane)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293820

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA 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 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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-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:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-05-01 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 150203, DDD (Dichlorodiphenyldichloroethane)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293762

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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 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:

SWAMP Data:

Non-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:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-05-01 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 150203, DDD (Dichlorodiphenyldichloroethane)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293781

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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 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:

SWAMP Data:

Non-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:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-05-01 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 150203, DDD (Dichlorodiphenyldichloroethane)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293760

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA 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 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:

SWAMP Data:

Non-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:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-05-01 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 150203, DDD (Dichlorodiphenyldichloroethane)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59744

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:

One sample was collected to evaluate sediment toxicity. The sample did not exhibit significant toxicity. The toxicity test included survival and growth of Hyalella azteca.

Data Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The sample was collected at station 519AMNDVY.

Temporal Representation:

The sample was collected in July 2008.

Environmental Conditions:

QAPP Information:

All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 150203, DDD (Dichlorodiphenyldichloroethane)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59833

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:

The sample result did not exceed the evaluation guideline value (28.0 ug/Kg dry weight).

Data Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for the sum of DDD (o,p' + p,p') 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 for this line of evidence was collected at one monitoring site [ American R @ Discovery Park - 519AMNDVY]

Temporal Representation:

Data was collected on 7/16/2008.

Environmental Conditions:

Staff is not 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 150203, DDD (Dichlorodiphenyldichloroethane)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297225

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:

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Sum DDD from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDD is 28 ug/kg. (dw = Dry Weight)

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-08-19 to 2015-08-18

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.


DECISION ID	150241	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

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)(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.

Line of Evidence (LOE) for Decision ID 150241, DDE (Dichlorodiphenyldichloroethylene)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293839

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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 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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDE [DDE(p,p')] criterion to protect 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:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-05-01 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 150241, DDE (Dichlorodiphenyldichloroethylene)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293644

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA 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 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDE [DDE(p,p')] criterion to protect 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:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-05-01 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 150241, DDE (Dichlorodiphenyldichloroethylene)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293895

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA 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 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDE [DDE(p,p')] criterion to protect human health from the 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: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-05-01 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 150241, DDE (Dichlorodiphenyldichloroethylene)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293642

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDE [DDE(p,p')] criterion to protect human health from the 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: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-05-01 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 150241, DDE (Dichlorodiphenyldichloroethylene)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59649

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:

The sample result did not exceed the evaluation guideline value (31.3 ug/Kg dry weight).

Data Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for the 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 for this line of evidence was collected at one monitoring site [ American R @ Discovery Park - 519AMNDVY]

Temporal Representation:

Data was collected on 7/16/2008.

Environmental Conditions:

Staff is not 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 150241, DDE (Dichlorodiphenyldichloroethylene)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59744

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:

One sample was collected to evaluate sediment toxicity. The sample did not exhibit significant toxicity. The toxicity test included survival and growth of Hyalella azteca.

Data Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The sample was collected at station 519AMNDVY.

Temporal Representation:

The sample was collected in July 2008.

Environmental Conditions:

QAPP Information:

All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 150241, DDE (Dichlorodiphenyldichloroethylene)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297333

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:

Data Reference:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Sum DDE from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDE is 31.3 ug/kg. (dw = Dry Weight)

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-08-19 to 2019-07-18

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.


DECISION ID	150216	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

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

Line of Evidence (LOE) for Decision ID 150216, DDT (Dichlorodiphenyltrichloroethane)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293804

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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 2 samples were collected, 2 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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The DDT(4,4') 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:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-10-05 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 150216, DDT (Dichlorodiphenyltrichloroethane)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297278

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

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:

Evaluation Guideline:

The evaluation guideline for Sum DDT from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDT is 62.9 ug/kg. (dw = Dry Weight)

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-08-19 to 2015-08-18

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 150216, DDT (Dichlorodiphenyltrichloroethane)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293842

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 SRCSD's Coordinated Monitoring Program data for NA 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 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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The DDT(4,4') 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: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-05-01 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 150216, DDT (Dichlorodiphenyltrichloroethane)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293807

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA 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 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The DDT(4,4') 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:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-05-01 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 150216, DDT (Dichlorodiphenyltrichloroethane)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293726

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA 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 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The DDT(4,4') 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:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-05-01 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Habitat, Tissue data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 150216, DDT (Dichlorodiphenyltrichloroethane)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297187

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:

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 150216, DDT (Dichlorodiphenyltrichloroethane)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297362

Pollutant:

Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)

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:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Total DDTs from MacDonald et al., 2000a which states that the probable effect concentration for Total DDTs is 572 ug/kg. (dw = Dry Weight)

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-08-19 to 2019-07-18

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 150216, DDT (Dichlorodiphenyltrichloroethane)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297197

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:

Data Reference:

Habitat, Tissue data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 150216, DDT (Dichlorodiphenyltrichloroethane)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293806

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 SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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 2 samples were collected, 2 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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The DDT(4,4') 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: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-10-05 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 150216, DDT (Dichlorodiphenyltrichloroethane)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293708

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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 2 samples were collected, 2 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The DDT(4,4') 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:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-10-05 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Sacramento River Watershed Program Annual Reports for 1999-2000, 2000-2001, 2001-2002, 2002-2003, and 2003-2004; and BDAT data 1998-2003

Line of Evidence (LOE) for Decision ID 150216, DDT (Dichlorodiphenyltrichloroethane)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

25903

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish whole body

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fish tissue analysis

Data Used to Assess Water Quality:

Four composite fish tissue samples were each analyzed for seven forms of DDT, including: DDT (o,p¿), DDT (p,p¿), DDD (o,p¿), DDD (p,p¿), DDE (o,p¿), DDE (p,p¿), DDMU (p,p¿).
The four composite fish tissue samples were Sacramento Sucker (captured from the American River at Discovery Park on 18 October 2005), White Catfish (captured from the American River at Discovery Park on 26 July 2005, Rainbow Trout (captured from the American River at the American River Hatchery on 21 September 2005, and Sacramento Sucker (captured from the American River at Nimbus Dam on 27 September, 2005.
Only the composite fish tissue sample of Rainbow Trout captured from the American River at American River Hatchery exceeded the OEHHA screening value of 21 ug/kg for DDT in fish tissue, and had a total DDT concentration of 29 ug/kg.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

Evaluation Guideline:

OEHHA 2008 Fish Contaminant Goals (FCG) are based on cancer risk assessments using an 8-Ounce/Week (prior to cooking) consumption rate of 32 g/day. The FCG used as a screening value for total DDT (with a cancer slope factor of 0.34 mg/kg/day) should be less than 21 ug/kg.

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:

Samples were collected from the lower American River at: Discovery Park (Sacramento Sucker and White Catfish); at the American River Hatchery (Rainbow Trout); and at Nimbus Dam (Sacramento Sucker).

Temporal Representation:

Environmental Conditions:

QAPP Information:

Data Quality: Good. Monitoring was conducted in accordance with Sacramento River Watershed Program QAPP requirements.

QAPP Information Reference(s):

Quality Assurance Project Plans prepared for Sacramento River Watershed Program

Line of Evidence (LOE) for Decision ID 150216, DDT (Dichlorodiphenyltrichloroethane)	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59650

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

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:

The sample result did not exceed the evaluation guideline value (62.9 ug/Kg dry weight).

Data Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for the sum of DDT is 62.9 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 was collected at one monitoring site [ American R @ Discovery Park - 519AMNDVY]

Temporal Representation:

Data was collected on 7/16/2008.

Environmental Conditions:

Staff is not 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	146235	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Deltamethrin
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)(2020)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	During the 2024 Cycle LOEs were updated due to a reassessment of data based on revised evaluation guidelines for pesticides. 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.

Line of Evidence (LOE) for Decision ID 146235, Deltamethrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

315365

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:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Deltamethrin. Although a total of 2 samples were collected, 2 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:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

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:

Evaluation Guideline:

The evaluation guideline for deltamethrin is the USEPA Aquatic Life Benchmark of 0.000026 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: 519SAC111 (American R at Upper Sunrise Recreation Area).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-12-16 to 2010-12-19

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 146235, Deltamethrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

315362

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:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Deltamethrin. Although a total of 2 samples were collected, 2 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:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

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:

Evaluation Guideline:

The evaluation guideline for deltamethrin is the USEPA Aquatic Life Benchmark of 0.000026 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: 519LSAC53 (American R at Howe Ave Access).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-12-18 to 2010-12-19

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 146235, Deltamethrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293898

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Deltamethrin. Although a total of 11 samples were collected, 11 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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-10-05 to 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146235, Deltamethrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293880

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:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Deltamethrin. Although a total of 2 samples were collected, 2 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:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for deltamethrin is the USEPA Aquatic Life Benchmark of 0.000026 ug/L for an invertebrate (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: 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-12-16 to 2010-12-19

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 146235, Deltamethrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297280

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:

Water Board staff assessed SWAMP Stream Pollution Trends data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Deltamethrin. Although a total of 6 samples were collected, 6 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:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for deltamethrin, 0.079 ug/g, is one-tenth of the median lethal concentration (LC50; 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

Guideline Reference:

Whole-sediment toxicity identification evaluation tools for pyrethroid insecticides: I. piperonyl butoxide addition. Environ. Toxicol. Chem. 26:2389-2396.

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Date for this waterbody were collected over the date range 2011-08-19 to 2016-07-27

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146235, Deltamethrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59651

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 for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline value for deltamethrin, 0.079 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 0.79 ug/g OC). The LC50 (0.79 ug/g OC) is the geometric mean of OC-normalized 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 was collected at one monitoring site [ American R @ Discovery Park - 519AMNDVY]

Temporal Representation:

Data was collected on 7/16/2008.

Environmental Conditions:

Staff is not 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 146235, Deltamethrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293608

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support and the results are as follows: 1 of the 1 samples exceeded the water quality threshold for Deltamethrin. Although a total of 10 samples were collected, 9 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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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 (Nimbus).

Temporal Representation:

Data for this waterbody was collected over the date range 2011-10-05 to 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146239	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Demeton
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:

Line of Evidence (LOE) for Decision ID 146239, Demeton	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293649

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:

Data Reference:

SWAMP Data:

Non-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:

Evaluation Guideline:

The USEPA National Recommended Water Quality criterion for demeton for freshwater aquatic life protection is 0.1 ug/l (4 day average)

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2012-01-21 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146239, Demeton	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293631

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:

Data Reference:

SWAMP Data:

Non-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:

Evaluation Guideline:

The USEPA National Recommended Water Quality criterion for demeton for freshwater aquatic life protection is 0.1 ug/l (4 day average)

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2014-11-01 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146141	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Diazinon
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. The number of measured exceedances is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicant pollutants (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 this water segment-pollutant combination should not be placed on the CWA section 303(d) List. Refer to the lines of evidence in this fact sheet for the data and information, sample counts and exceedances, quality assurance documentation, beneficial uses, and water quality objectives or numeric evaluation guidelines relied upon for this decision.

Regional Board Decision Recommendation:	After review of 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:

Line of Evidence (LOE) for Decision ID 146141, Diazinon	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297312

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:

Water Board staff assessed SWAMP Stream Pollution Trends data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Diazinon. Although a total of 4 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:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for diazinon, 1.1 ug/g, is one-tenth of the median lethal concentration for H. azteca(LC50; 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 were collected from 1 station(s). Station Code(s): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-08-19 to 2015-08-18

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146141, Diazinon	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293850

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 SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality threshold for Diazinon.

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-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:

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: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2011-04-19 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 146141, Diazinon	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59653

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:

The sample was below both the reporting limit (5 ng/g dry weight) and the organic carbon-normalized evaluation guideline value (1.1 ug/g OC) and could not be quantified with the level of certainty required by the listing policy.

Data Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline value for diazinon, 1.1 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 11 ug/g OC). The LC50 (11 ug/g OC) is the geometric mean of OC-normalized LC50 values for diazinon (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 was collected at one monitoring site [ American R @ Discovery Park - 519AMNDVY]

Temporal Representation:

Data was collected on 7/16/2008.

Environmental Conditions:

Staff is not 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 146141, Diazinon	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

2651

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Eighty-six samples were taken; 3 exceeded the CDFG 4-day average and 1 exceeded the 1-hour criteria. Two samples were less than values and could not be used. Analysis methods used were GC/MS in 1991-92; ELISA in 1997-99; and EPA 8141 from 1999-2003. (Larry Walker & Associates, 2002).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. Total identifiable persistent chlorinated hydrocarbon pesticides shall not be present in the water column at concentrations detectable within the accuracy of analytical methods approved by the Environmental Protection Agency or the executive Officer.

Objective/Criterion Reference:

Evaluation Guideline:

Diazinon - CDFG Hazard Assessment Criteria - 0.10 ug/L 4-day average and 0.16 ug/L 1-hour average (Siepman & Finlayson, 2000; Finlayson, 2004).

Guideline Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Spatial Representation:

All samples were collected at the American River at Discovery Park.

Temporal Representation:

Samples were collected monthly from 1997-99, 2001-2002; 2 samples were collected in 1991; 3 in 1992; and 3 in 2000. Samples were collected for the first 6 months in 2003.

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 146141, Diazinon	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293748

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:

SWAMP Data:

Non-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:

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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2011-02-16 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146142	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Dibenz[a,h]anthracene
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. The number of measured exceedances is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicant pollutants (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 this water segment-pollutant combination should not be placed on the CWA section 303(d) List. Refer to the lines of evidence in this fact sheet for the data and information, sample counts and exceedances, quality assurance documentation, beneficial uses, and water quality objectives or numeric evaluation guidelines relied upon for this decision.

Regional Board Decision Recommendation:	After review of 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:

Line of Evidence (LOE) for Decision ID 146142, Dibenz[a,h]anthracene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293828

Pollutant:

Dibenz[a,h]anthracene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dibenz(a,h)anthracene. Although a total of 11 samples were collected, 11 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dibenzo(a, h)anthracene criterion for the protection of human health from the consumption of water and organisms is 0.0044 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2015-02-07

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146142, Dibenz[a,h]anthracene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293771

Pollutant:

Dibenz[a,h]anthracene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dibenz(a,h)anthracene. Although a total of 12 samples were collected, 12 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dibenzo(a, h)anthracene criterion for the protection of human health from the consumption of water and organisms is 0.0044 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146142, Dibenz[a,h]anthracene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293866

Pollutant:

Dibenz[a,h]anthracene

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 SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 10 samples exceeded the water quality threshold for Dibenz(a,h)anthracene. Although a total of 11 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dibenzo(a, h)anthracene criterion for the protection of human health from consumption of organisms only is 0.049 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Discovery).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-10-05 to 2015-02-07

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146142, Dibenz[a,h]anthracene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293831

Pollutant:

Dibenz[a,h]anthracene

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 SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support and the results are as follows: 0 of the 11 samples exceeded the water quality threshold for Dibenz(a,h)anthracene. Although a total of 12 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dibenzo(a, h)anthracene criterion for the protection of human health from consumption of organisms only is 0.049 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Nimbus).

Temporal Representation:

Data for this waterbody was collected over the date range 2010-10-05 to 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146144	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Dibutyl phthalate
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. 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:

Line of Evidence (LOE) for Decision ID 146144, Dibutyl phthalate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293670

Pollutant:

Dibutyl phthalate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 di-n-butyl phthalate criterion for the protection of human health from the consumption of water and organisms is 2,700 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146144, Dibutyl phthalate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293688

Pollutant:

Dibutyl phthalate

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:

Non-SWAMP

Water Quality Objective/Criterion:

The di-n-butyl phthalate criteria for the protection of human health from the consumption of organisms is 12000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146144, Dibutyl phthalate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293671

Pollutant:

Dibutyl phthalate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 di-n-butyl phthalate criterion for the protection of human health from the consumption of water and organisms is 2,700 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146144, Dibutyl phthalate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293669

Pollutant:

Dibutyl phthalate

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:

Non-SWAMP

Water Quality Objective/Criterion:

The di-n-butyl phthalate criteria for the protection of human health from the consumption of organisms is 12000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146145	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Dichlorobromomethane
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. 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:

Line of Evidence (LOE) for Decision ID 146145, Dichlorobromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293305

Pollutant:

Dichlorobromomethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 dichlorobromomethane criterion for the protection of human health from the consumption of water and organisms is 0.56 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146145, Dichlorobromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297388

Pollutant:

Dichlorobromomethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Bromodichloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Dichlorobromomethane criteria for the protection of human health from consumption of organisms only is 46 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146145, Dichlorobromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297431

Pollutant:

Dichlorobromomethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Bromodichloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Dichlorobromomethane criteria for the protection of human health from consumption of organisms only is 46 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146145, Dichlorobromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297435

Pollutant:

Dichlorobromomethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Bromodichloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Dichlorobromomethane criteria for the protection of human health from consumption of organisms only is 46 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146145, Dichlorobromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297438

Pollutant:

Dichlorobromomethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Bromodichloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichlorobromomethane criterion for the protection of human health from the consumption of water and organisms is 0.56 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146145, Dichlorobromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297439

Pollutant:

Dichlorobromomethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Bromodichloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichlorobromomethane criterion for the protection of human health from the consumption of water and organisms is 0.56 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146145, Dichlorobromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297437

Pollutant:

Dichlorobromomethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Bromodichloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichlorobromomethane criterion for the protection of human health from the consumption of water and organisms is 0.56 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146145, Dichlorobromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297442

Pollutant:

Dichlorobromomethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Bromodichloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichlorobromomethane criterion for the protection of human health from the consumption of water and organisms is 0.56 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146145, Dichlorobromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297445

Pollutant:

Dichlorobromomethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Bromodichloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichlorobromomethane criterion for the protection of human health from the consumption of water and organisms is 0.56 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146145, Dichlorobromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297447

Pollutant:

Dichlorobromomethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Bromodichloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Dichlorobromomethane criteria for the protection of human health from consumption of organisms only is 46 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146145, Dichlorobromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293308

Pollutant:

Dichlorobromomethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 dichlorobromomethane criterion for the protection of human health from the consumption of water and organisms is 0.56 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146145, Dichlorobromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297432

Pollutant:

Dichlorobromomethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Bromodichloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Dichlorobromomethane criteria for the protection of human health from consumption of organisms only is 46 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146145, Dichlorobromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297444

Pollutant:

Dichlorobromomethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Bromodichloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichlorobromomethane criterion for the protection of human health from the consumption of water and organisms is 0.56 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146145, Dichlorobromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297446

Pollutant:

Dichlorobromomethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Bromodichloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Dichlorobromomethane criteria for the protection of human health from consumption of organisms only is 46 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146145, Dichlorobromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297436

Pollutant:

Dichlorobromomethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Bromodichloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Dichlorobromomethane criteria for the protection of human health from consumption of organisms only is 46 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146145, Dichlorobromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297433

Pollutant:

Dichlorobromomethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Bromodichloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Dichlorobromomethane criteria for the protection of human health from consumption of organisms only is 46 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146145, Dichlorobromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297440

Pollutant:

Dichlorobromomethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Bromodichloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichlorobromomethane criterion for the protection of human health from the consumption of water and organisms is 0.56 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146145, Dichlorobromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293289

Pollutant:

Dichlorobromomethane

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:

Non-SWAMP

Water Quality Objective/Criterion:

The Dichlorobromomethane criteria for the protection of human health from consumption of organisms only is 46 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146145, Dichlorobromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297441

Pollutant:

Dichlorobromomethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Bromodichloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichlorobromomethane criterion for the protection of human health from the consumption of water and organisms is 0.56 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146145, Dichlorobromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297443

Pollutant:

Dichlorobromomethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Bromodichloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichlorobromomethane criterion for the protection of human health from the consumption of water and organisms is 0.56 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146145, Dichlorobromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297434

Pollutant:

Dichlorobromomethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Bromodichloromethane.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Dichlorobromomethane criteria for the protection of human health from consumption of organisms only is 46 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146145, Dichlorobromomethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293303

Pollutant:

Dichlorobromomethane

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:

Non-SWAMP

Water Quality Objective/Criterion:

The Dichlorobromomethane criteria for the protection of human health from consumption of organisms only is 46 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146146	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Dichloromethane
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. 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:

Line of Evidence (LOE) for Decision ID 146146, Dichloromethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297775

Pollutant:

Dichloromethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Methylene Chloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichloromethane (methylene chloride) criterion for the protection of human health from the consumption of water and organisms is 4.7 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146146, Dichloromethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297779

Pollutant:

Dichloromethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Methylene Chloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichloromethane (methylene chloride) criterion for the protection of human health from consumption of organisms only is 1,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146146, Dichloromethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297803

Pollutant:

Dichloromethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Methylene Chloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichloromethane (methylene chloride) criterion for the protection of human health from consumption of organisms only is 1,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146146, Dichloromethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297800

Pollutant:

Dichloromethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Methylene Chloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichloromethane (methylene chloride) criterion for the protection of human health from consumption of organisms only is 1,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775867 (R-002).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2013-12-02

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146146, Dichloromethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

295177

Pollutant:

Dichloromethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Methylene Chloride. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichloromethane (methylene chloride) criterion for the protection of human health from the consumption of water and organisms is 4.7 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146146, Dichloromethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297724

Pollutant:

Dichloromethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Methylene Chloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichloromethane (methylene chloride) criterion for the protection of human health from the consumption of water and organisms is 4.7 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146146, Dichloromethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297752

Pollutant:

Dichloromethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Methylene Chloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichloromethane (methylene chloride) criterion for the protection of human health from the consumption of water and organisms is 4.7 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775870 (R-006).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146146, Dichloromethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297776

Pollutant:

Dichloromethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Methylene Chloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichloromethane (methylene chloride) criterion for the protection of human health from the consumption of water and organisms is 4.7 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146146, Dichloromethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297746

Pollutant:

Dichloromethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Methylene Chloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichloromethane (methylene chloride) criterion for the protection of human health from the consumption of water and organisms is 4.7 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146146, Dichloromethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297723

Pollutant:

Dichloromethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Methylene Chloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichloromethane (methylene chloride) criterion for the protection of human health from the consumption of water and organisms is 4.7 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146146, Dichloromethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297777

Pollutant:

Dichloromethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Methylene Chloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichloromethane (methylene chloride) criterion for the protection of human health from consumption of organisms only is 1,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146146, Dichloromethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297773

Pollutant:

Dichloromethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Methylene Chloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichloromethane (methylene chloride) criterion for the protection of human health from the consumption of water and organisms is 4.7 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146146, Dichloromethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297748

Pollutant:

Dichloromethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Methylene Chloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichloromethane (methylene chloride) criterion for the protection of human health from consumption of organisms only is 1,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146146, Dichloromethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297747

Pollutant:

Dichloromethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Methylene Chloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichloromethane (methylene chloride) criterion for the protection of human health from the consumption of water and organisms is 4.7 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146146, Dichloromethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297722

Pollutant:

Dichloromethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Methylene Chloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichloromethane (methylene chloride) criterion for the protection of human health from consumption of organisms only is 1,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775873 (R-011).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146146, Dichloromethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

295159

Pollutant:

Dichloromethane

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:

Non-SWAMP

Water Quality Objective/Criterion:

The dichloromethane (methylene chloride) criterion for the protection of human health from consumption of organisms only is 1,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146146, Dichloromethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

295158

Pollutant:

Dichloromethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Methylene Chloride. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichloromethane (methylene chloride) criterion for the protection of human health from the consumption of water and organisms is 4.7 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-10-05 to 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146146, Dichloromethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

295176

Pollutant:

Dichloromethane

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:

Non-SWAMP

Water Quality Objective/Criterion:

The dichloromethane (methylene chloride) criterion for the protection of human health from consumption of organisms only is 1,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146146, Dichloromethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297802

Pollutant:

Dichloromethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Methylene Chloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichloromethane (methylene chloride) criterion for the protection of human health from consumption of organisms only is 1,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146146, Dichloromethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297751

Pollutant:

Dichloromethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Methylene Chloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichloromethane (methylene chloride) criterion for the protection of human health from consumption of organisms only is 1,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146146, Dichloromethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297774

Pollutant:

Dichloromethane

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Methylene Chloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichloromethane (methylene chloride) criterion for the protection of human health from the consumption of water and organisms is 4.7 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146146, Dichloromethane	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297778

Pollutant:

Dichloromethane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Methylene Chloride.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dichloromethane (methylene chloride) criterion for the protection of human health from consumption of organisms only is 1,600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775872 (R-010).

Temporal Representation:

The samples were collected between the dates of 2013-02-05 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146147	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

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 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.

Line of Evidence (LOE) for Decision ID 146147, Dieldrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294072

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dieldrin. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dieldrin criterion for the protection of 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:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-05-01 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146147, Dieldrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294007

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dieldrin. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dieldrin criterion 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:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-05-01 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146147, Dieldrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294053

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dieldrin. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dieldrin criterion for the protection of 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:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-05-01 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146147, Dieldrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294030

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dieldrin. 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dieldrin criterion 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:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-05-01 to 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Habitat, Tissue data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146147, Dieldrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297179

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:

Waterboard staff assessed SWAMP Sportfish Rivers and Streams data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: Zero of Zero samples exceeded the water quality threshold for Dieldrin. Although data was collected for 1 fish species (1 composite(s) of Sacramento Sucker each composed of 5 fish per composite), all 1 sample(s) had to be thrown out due to quantitation issues.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146147, Dieldrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

25904

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish whole body

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fish tissue analysis

Data Used to Assess Water Quality:

Five composite fish tissue samples were each analyzed for Dieldrin.
The five composite fish tissue samples were Sacramento Sucker (captured from the American River at Discovery Park on 18 October 2005), White Catfish (captured from the American River at Discovery Park on 26 July 2005, Rainbow Trout (captured from the American River at the American River Hatchery on 21 September 2005, Sacramento Sucker (captured from the American River at Nimbus Dam on 27 September, 2005; and Chinook (captured from the American River at Nimbus Fish Hatchery on 01 November 2005).
Two composite fish tissue samples exceeded the OEHHA screening value of 0.46 ug/kg for Dieldrin in fish tissue: Sacramento Sucker captured from the American River at Discovery Park (1.62 ug/kg) and Chinook captured from the American River at Nimbus Fish Hatchery 0.539 ug/kg).

Data Reference:

Sacramento River Watershed Program Annual Reports for 1999-2000, 2000-2001, 2001-2002, 2002-2003, and 2003-2004; and BDAT data 1998-2003

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

Evaluation Guideline:

OEHHA 2008 Fish Contaminant Goals (FCG) are based on cancer risk assessments using an 8-Ounce/Week (prior to cooking) consumption rate of 32 g/day. The FCG used as a screening value for Dieldrin (with a cancer slope factor of 16 mg/kg/day) should be less than 0.46 ug/kg.

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:

Samples were collected from the lower American River at: Discovery Park (Sacramento Sucker and White Catfish); at the American River Hatchery (Rainbow Trout); at Nimbus Dam (Sacramento Sucker); and at Nimbus Fish Hatchery (Chinook). The chinook salmon, being an anadromous fish, is not representative of dieldrin in the American river.

Temporal Representation:

Sacramento Sucker were captured from the American River at Discovery Park on 18 October 2005; White Catfish were captured from the American River at Discovery Park on 26 July 2005; Rainbow Trout were captured from the American River Hatchery on 21 September 2005; Sacramento Sucker were captured from the American RIver at Nimbus Dam on 27 September, 2005; and Chinook were captured from the Amercian River at Nimbus Fish Hatchery on 01 November 2005.

Environmental Conditions:

QAPP Information:

Data Quality: Good. Monitoring was conducted in accordance with Sacramento River Watershed Program QAPP requirements.

QAPP Information Reference(s):

Quality Assurance Project Plans prepared for Sacramento River Watershed Program

Line of Evidence (LOE) for Decision ID 146147, Dieldrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293985

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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dieldrin criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater 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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2012-05-01 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146147, Dieldrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297314

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:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Dieldrin from MacDonald et al., 2000a which states that the probable effect concentration for Dieldrin is 61.8 ug/kg. (dw = Dry Weight)

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-08-19 to 2015-08-18

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146147, Dieldrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297178

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:

Habitat, Tissue data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146147, Dieldrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59663

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:

The sample result did not exceed the evaluation guideline value (61.8 ug/Kg dry weight).

Data Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

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 was collected at one monitoring site [ American R @ Discovery Park - 519AMNDVY]

Temporal Representation:

Data was collected on 7/16/2008.

Environmental Conditions:

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

QAPP Information:

The SWAMP QAMP (2002) was used for data before Septemper 1, 2008 and SWAMP QAPP (2008) was thereafter.

QAPP Information Reference(s):

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

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 146147, Dieldrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294054

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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dieldrin criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater 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: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2012-05-01 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146148	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Diethyl phthalate
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:

Line of Evidence (LOE) for Decision ID 146148, Diethyl phthalate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294094

Pollutant:

Diethyl phthalate

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:

Non-SWAMP

Water Quality Objective/Criterion:

The diethylphthalate criterion for the protection of human health from consumption of organisms only is 120,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146148, Diethyl phthalate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294095

Pollutant:

Diethyl phthalate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 diethylphthalate criterion for the protection of human health from the consumption of water and organisms is 23,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146148, Diethyl phthalate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294075

Pollutant:

Diethyl phthalate

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:

Non-SWAMP

Water Quality Objective/Criterion:

The diethylphthalate criterion for the protection of human health from consumption of organisms only is 120,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146148, Diethyl phthalate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294074

Pollutant:

Diethyl phthalate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 diethylphthalate criterion for the protection of human health from the consumption of water and organisms is 23,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146149	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Dimethyl phthalate
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:

Line of Evidence (LOE) for Decision ID 146149, Dimethyl phthalate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293940

Pollutant:

Dimethyl phthalate

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:

Non-SWAMP

Water Quality Objective/Criterion:

The dimethyl phthalate criterion for the protection of human health from consumption of organisms only is 2,900,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146149, Dimethyl phthalate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293941

Pollutant:

Dimethyl phthalate

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:

Non-SWAMP

Water Quality Objective/Criterion:

The dimethyl phthalate criterion for the protection of human health from consumption of organisms only is 2,900,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146149, Dimethyl phthalate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293944

Pollutant:

Dimethyl phthalate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 dimethyl phthalate criterion for the protection of human health from the consumption of water and organisms is 313,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146149, Dimethyl phthalate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293963

Pollutant:

Dimethyl phthalate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 dimethyl phthalate criterion for the protection of human health from the consumption of water and organisms is 313,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146150	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Dinitro-o-cresol
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:

Line of Evidence (LOE) for Decision ID 146150, Dinitro-o-cresol	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293991

Pollutant:

Dinitro-o-cresol

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 2-methyl-4, 6-dinitrophenol criterion for the protection of human health from consumption of organisms only is 765 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146150, Dinitro-o-cresol	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293990

Pollutant:

Dinitro-o-cresol

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 2-methyl-4, 6-dinitrophenol criterion for the protection of human health from the consumption of water and organisms is 13.4 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146150, Dinitro-o-cresol	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293988

Pollutant:

Dinitro-o-cresol

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:

Non-SWAMP

Water Quality Objective/Criterion:

The 2-methyl-4, 6-dinitrophenol criterion for the protection of human health from consumption of organisms only is 765 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146150, Dinitro-o-cresol	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

293989

Pollutant:

Dinitro-o-cresol

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

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 2-methyl-4, 6-dinitrophenol criterion for the protection of human health from the consumption of water and organisms is 13.4 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2011-04-19

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146151	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Disulfoton
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.

Line of Evidence (LOE) for Decision ID 146151, Disulfoton	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294121

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA 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 7 samples were collected, 7 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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: Nimbus (Nimbus).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-01-21 to 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146151, Disulfoton	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294167

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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 7 samples were collected, 7 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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2012-02-29 to 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146152	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

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:	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:

Line of Evidence (LOE) for Decision ID 146152, Diuron	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

292108

Pollutant:

Diuron

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 USGS California Water Science Center data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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:

Non-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:

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: USGS-383609121293200 (AMERICAN R 1 MI AB MOUTH CA).

Temporal Representation:

The samples were collected between the dates of 2016-10-26 and 2016-10-26

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146152, Diuron	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294190

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:

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-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:

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: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146152, Diuron	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294236

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:

Data Reference:

SWAMP Data:

Non-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:

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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Habitat, Tissue data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146153	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

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.

Line of Evidence (LOE) for Decision ID 146153, Endosulfan	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297180

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:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146153, Endosulfan	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297181

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:

Data Reference:

Habitat, Tissue data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.


DECISION ID	146155	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

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:

Line of Evidence (LOE) for Decision ID 146155, Endosulfan sulfate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294416

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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endosulfan sulfate criterion for the protection 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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2012-02-29 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146155, Endosulfan sulfate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294369

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA National Recommended Water Quality Criteria toxicity threshold for endosulfan sulfate for freshwater aquatic life protection is 0.056 ug/l (24 hour average)

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2012-02-29 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146155, Endosulfan sulfate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294370

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA National Recommended Water Quality Criteria toxicity threshold for endosulfan sulfate for freshwater aquatic life protection is 0.056 ug/l (24 hour average)

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2012-02-29 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146155, Endosulfan sulfate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294278

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:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endosulfan sulfate 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: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2012-02-29 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146155, Endosulfan sulfate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294348

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:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endosulfan sulfate 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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2012-02-29 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146155, Endosulfan sulfate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294346

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endosulfan sulfate criterion for the protection 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: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2012-02-29 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146156	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Endrin
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.

Line of Evidence (LOE) for Decision ID 146156, Endrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294456

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endrin criterion to protect human health from the consumption of organisms only is 0.81 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2012-05-01 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Habitat, Tissue data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146156, Endrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297145

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:

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146156, Endrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297144

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:

Habitat, Tissue data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146156, Endrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294575

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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endrin criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater 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: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2012-05-01 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146156, Endrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297319

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:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for Endrin from MacDonald et al., 2000a which states that the probable effect concentration for Endrin is 207 ug/kg. (dw = Dry Weight)

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): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-08-19 to 2015-08-18

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146156, Endrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59666

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:

The sample result did not exceed the evaluation guideline value (207 ug/Kg dry weight).

Data Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

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 was collected at one monitoring site [ American R @ Discovery Park - 519AMNDVY]

Temporal Representation:

Data was collected on 7/16/2008.

Environmental Conditions:

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

QAPP Information:

The SWAMP QAMP (2002) was used for data before Septemper 1, 2008 and SWAMP QAPP (2008) was thereafter.

QAPP Information Reference(s):

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

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 146156, Endrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294528

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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endrin criterion to protect human health from the consumption of organisms only is 0.81 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2012-05-01 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146156, Endrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294476

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endrin criterion to protect 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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2012-05-01 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146156, Endrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294503

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endrin criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater 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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2012-05-01 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146156, Endrin	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294522

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endrin criterion to protect 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: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2012-05-01 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146157	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

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:

Line of Evidence (LOE) for Decision ID 146157, Endrin aldehyde	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294356

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endrin aldehyde criterion to protect 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: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2012-05-01 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146157, Endrin aldehyde	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294331

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endrin aldehyde criterion to protect human health from the consumption of organisms only is 0.81 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2012-05-01 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146157, Endrin aldehyde	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294328

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endrin aldehyde criterion to protect 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: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2012-05-01 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146157, Endrin aldehyde	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294352

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The endrin aldehyde criterion to protect human health from the consumption of organisms only is 0.81 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2012-05-01 and 2012-05-01

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):


DECISION ID	146240	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Esfenvalerate/Fenvalerate
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)(2020)
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:

Line of Evidence (LOE) for Decision ID 146240, Esfenvalerate/Fenvalerate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

59678

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:

The sample was below both the reporting limit (1 ng/g dry weight) and the organic carbon-normalized evaluation guideline value (0.15 ug/g OC) and could not be quantified with the level of certainty required by the listing policy.

Data Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline value for esfenvalerate/fenvalerate, 0.15 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 1.5 ug/g OC). The LC50 (1.5 ug/g OC) is the geometric mean of OC-normalized 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 was collected at one monitoring site [ American R @ Discovery Park - 519AMNDVY]

Temporal Representation:

Data was collected on 7/16/2008.

Environmental Conditions:

Staff is not 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 146240, Esfenvalerate/Fenvalerate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

189819

Pollutant:

Esfenvalerate/Fenvalerate

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 RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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 2 samples were collected, 2 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:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

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:

Evaluation Guideline:

The chronic concentration goal 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:

Amendment to the Water Quality Control Plan for the Sacramento River and San Joaquin River Basins for the Control of Pyrethroid Pesticide Discharges

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (519SAC126).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-12-18 to 2010-12-19

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 146240, Esfenvalerate/Fenvalerate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297324

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:

Water Board staff assessed SWAMP Stream Pollution Trends data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and the results are as follows: 0 of the 6 samples exceeded the evaluation guideline for Esfenvalerate/Fenvalerate, Total. Although a total of 7 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:

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The evaluation guideline for esfenvalerate/fenvalerate, 0.15 ug/g, is one-tenth of the median lethal concentration (LC50; 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

Guideline Reference:

Whole-sediment toxicity identification evaluation tools for pyrethroid insecticides: I. piperonyl butoxide addition. Environ. Toxicol. Chem. 26:2389-2396.

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-08-19 to 2016-07-27

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

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 146240, Esfenvalerate/Fenvalerate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294398

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support and the results are as follows: 1 of the 1 samples exceeded the water quality threshold for Esfenvalerate. Although a total of 14 samples were collected, 13 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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-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:

Evaluation Guideline:

The chronic concentration goal for esfenvalerate is 0.3 ng/LÂ (expressed as a 4-day average).Â If the freely dissolved concentrations of Esfenvalerate were reported or could be calculated then these values were used for this assessment.Â 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

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (Nimbus).

Temporal Representation:

Data for this waterbody was collected over the date range 2011-04-19 to 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

Line of Evidence (LOE) for Decision ID 146240, Esfenvalerate/Fenvalerate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

189799

Pollutant:

Esfenvalerate/Fenvalerate

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 RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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 2 samples were collected, 2 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:

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:

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

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (519SAC111).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-12-16 to 2010-12-19

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 146240, Esfenvalerate/Fenvalerate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

189740

Pollutant:

Esfenvalerate/Fenvalerate

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 RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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 2 samples were collected, 2 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:

Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5.

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:

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

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (519LSAC53).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-12-18 to 2010-12-19

Environmental Conditions:

QAPP Information:

SWAMP QAPrP 2008

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 146240, Esfenvalerate/Fenvalerate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294440

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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 15 samples were collected, 15 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:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-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:

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

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

Data for this waterbody were collected over the date range 2011-04-19 to 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

Field, Habitat, Toxicity, WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146240, Esfenvalerate/Fenvalerate	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294377

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:

Water Board staff assessed SWAMP RWB5 Monitoring data for American River, Lower (Nimbus Dam to confluence with Sacramento River) 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 2 samples were collected, 2 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:

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:

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

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 519AMNDVY (American R @ Discovery Park).

Temporal Representation:

Data for this waterbody were collected over the date range 2010-12-16 to 2010-12-19

Environmental Conditions:

QAPP Information:

SWRCB. 2018. This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements..

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.


DECISION ID	151774	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

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:	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:

Line of Evidence (LOE) for Decision ID 151774, Ethion	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

307388

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:

Water Board staff assessed SRCSD's Coordinated Monitoring Program data for NA to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Ethion.

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA National Recommended Water Quality Criteria toxicity threshold for ethion for freshwater aquatic life protection is 0.02 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Nimbus (Nimbus).

Temporal Representation:

The samples were collected between the dates of 2011-04-19 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 151774, Ethion	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

307386

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:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The USEPA National Recommended Water Quality Criteria toxicity threshold for ethion for freshwater aquatic life protection is 0.02 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2011-04-19 and 2015-05-12

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.


DECISION ID	146158	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

Pollutant:	Ethylbenzene
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. 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:

Line of Evidence (LOE) for Decision ID 146158, Ethylbenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297692

Pollutant:

Ethylbenzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Ethylbenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for Ethylbenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.3 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775869 (R-005).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146158, Ethylbenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297666

Pollutant:

Ethylbenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality threshold for Ethylbenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The ethylbenzene criterion for the protection of human health from consumption of organisms only is 29,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775890 (R-003).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2016-01-05

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146158, Ethylbenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297694

Pollutant:

Ethylbenzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Ethylbenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for Ethylbenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.3 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775871 (R-007).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146158, Ethylbenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297633

Pollutant:

Ethylbenzene

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality threshold for Ethylbenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The ethylbenzene criterion for the protection of human health from consumption of organisms only is 29,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775866 (R-001).

Temporal Representation:

The samples were collected between the dates of 2013-02-04 and 2016-01-07

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146158, Ethylbenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

294602

Pollutant:

Ethylbenzene

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:

Non-SWAMP

Water Quality Objective/Criterion:

The ethylbenzene criterion for the protection of human health from consumption of organisms only is 29,000 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: Discovery (Discovery).

Temporal Representation:

The samples were collected between the dates of 2010-10-05 and 2010-10-05

Environmental Conditions:

QAPP Information:

Sacramento Area Sewer District and Sacramento Regional County Sanitation District.2011.SRCSD's Coordinated Monitoring Program

QAPP Information Reference(s):

WQ data from the California Integrated Water Quality System (CIWQS) assembled for the 2024 Integrated Report in Region 5.

Line of Evidence (LOE) for Decision ID 146158, Ethylbenzene	Region 5
American River, Lower (Nimbus Dam to confluence with Sacramento River)

LOE ID:

297691

Pollutant:

Ethylbenzene

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 eSMR_Aerojet Interim GW Extraction & Treatment System data for American River, Lower (Nimbus Dam to confluence with Sacramento River) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Ethylbenzene.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Primary Maximum Contaminant Level for Ethylbenzene incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.3 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 775868 (R-004).

Temporal Representation:

The samples were collected between the dates of 2013-02-06 and 2013-12-03

Environmental Conditions:

QAPP Information:

Geosyntec.2021.Aerojet Superfund Site

QAPP Information Reference(s):