Draft California 2020 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 1 - North Coast Region

Water Body Name:	Eel River HU, Upper Main HA (Includes Tomki Creek)
Water Body ID:	CAR1116206119990528152745
Water Body Type:	River & Stream


DECISION ID	78544	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Temperature, water
Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)(2016)
Revision Status	Revised
Sources:	Flow Alteration/Regulation/Modification \| Removal of Riparian Vegetation
TMDL Name:	Eel River, Upper Mainstem Sediment and Temperature TMDLs
TMDL Project Code:	602
Date TMDL Approved by USEPA:	12/29/2004
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the Section 303(d) List under Section 4.2 of the Listing Policy. Under this section of the Policy, a minimum of one line of evidence is needed to assess listing status. Nineteen lines of evidence are available in the administrative record. Zero of 6 samples from the mainstem Eel River (LOEs 101033, 43225, & 101020) exceed the objective for COLD. Zero of 4 samples from Blue Slide Creek (LOEs 101018 & 101030), and Bucknell Creek (LOEs 133579 & 101099) exceed the objective for COLD. Zero of two samples from Outlet Creek (LOE 43970) exceed the objective for COLD. Zero of one samples from Trout Creek l(LOE101023), Bear Creek (LOE 101029), Rattlesnake Creek (LOE 101034), Panther Creek (LOE 100995), Thistle Glade Creek (LOE 101035), Cold Creek (LOE 101031), Corbin Creek (LOE 101032), and Rice Creek (101022) exceed the objective for COLD. These sample sizes are not sufficient to determine with the power and confidence of the Listing Policy if the cold freshwater habitat (COLD) beneficial use is being protected in these water bodies, as a minimum of 26 samples is needed for application of Table 4.2. 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) The "Upper Main Eel River and Tributaries (including Tomki Creek, Outlet Creek, and Lake Pillsbury) TMDLs for Temperature and Sediment" has confirmed temperatures in the Upper Main HA (including Tomki Creek) do not reflect natural conditions. (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:

Line of Evidence (LOE) for Decision ID 78544, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101033

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 11.7 degrees C.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature.

Objective/Criterion Reference:

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

Evaluation Guideline:

According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.

Guideline Reference:

Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region

Spatial Representation:

The samples were collected at 1 monitoring site(s) Eel River ~1.4mi above Trout Cr. (111ERATRC).

Temporal Representation:

The samples were collected between the dates of 10/10/2012.

Environmental Conditions:

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

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 78544, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

31521

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

The following process is utilized to interpret the narrative temperature objective in the Basin Plan for impairment assessments. Step 1: Determine if temperatures reflect natural conditions. If Yes, then the water body is not considered impaired, if No, then go to Step 2. Step 2: Determine if temperatures adversely affect beneficial uses. If Yes, then the water body is considered impaired, if No , then go to Step 3. Step 3: Determine if temperatures are increased by 5 degrees F. If Yes, then water body is impaired, if No, then water body is not impaired.

Data Reference:

Presentation: Interpreting Temperature Standards in the North Coast Region. North Coast Regional Water Quality Control Board.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature.

Objective/Criterion Reference:

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

Evaluation Guideline:

EVIDENCE OF ALTERATION OF NATURAL RECEIVING WATER TEMPERATURES (NON-NATURAL TEMPS): The water temperatures of the Eel River HU, Upper Main HA do not reflect natural conditions as environmental factors that influence water temperature have been altered by riparian shade removal and flow alterations due to dam construction (USEPA 2004). EVIDENCE OF SALMONID PRESENCE & LIFE CYCLE USE: Coho, steelhead, and Chinook are present in the watershed (USEPA 2004). Rearing occurs year round and spawning/ incubation/ emergence occurs from November to June (Busby et al. 1996; CDFG 2004; Myers et al. 1998). Non-core rearing occurs in the mainstem Upper Main Eel River, while core rearing occurs in tributaries to the Upper Main.

Guideline Reference:

Recovery Strategy for California Coho Salmon: Report to the California Fish and Game Commission

Guideline Reference:

Status Review of Chinook Salmon from Washington, Idaho, Oregon, and California.

Guideline Reference:

Status Review of West Coast Steelhead from Washington, Idaho, Oregon, and California

Guideline Reference:

Upper Main Eel River and Tributaries (including Tomki Creek, Outlet Creek and Lake Pillsbury) Total Maximum Daily Loads for Temperature and Sediment

Spatial Representation:

Information pertains to the Eel River HU, Upper Main HA (Includes Tomki Creek)

Temporal Representation:

Data are reflective of current conditions in this water body.

Environmental Conditions:

QAPP Information:

Information is considered to be of adequate quality for the Integrated Report process.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 78544, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

100995

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Panther Creek ~2.6mi above Welch Cr. (111PS0160).

Temporal Representation:

The samples were collected between the dates of 7/25/2011.

Environmental Conditions:

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

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 78544, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101034

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Rattlesnake Creek ~0.5mi above Eel River (111WER008).

Temporal Representation:

The samples were collected between the dates of 7/23/2012.

Environmental Conditions:

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

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 78544, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101023

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Trout Creek ~0.1mi above Eel River (111WER003).

Temporal Representation:

The samples were collected between the dates of 6/10/2014.

Environmental Conditions:

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

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 78544, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101032

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Corbin Creek ~0.1mi abive Eel River (111CBCAER).

Temporal Representation:

The samples were collected between the dates of 8/8/2013.

Environmental Conditions:

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

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 78544, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101020

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Eel River ~1.75 miles above Wesley Ives Creek (111WE0816).

Temporal Representation:

The samples were collected between the dates of 6/12/2013.

Environmental Conditions:

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

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 78544, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101031

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Cold Creek above Eel River (111FS0007).

Temporal Representation:

The samples were collected between the dates of 7/11/2011.

Environmental Conditions:

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

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 78544, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

4784

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Not Specified

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

Placeholder reference pre-2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Unknown

Temporal Representation:

Unknown

Environmental Conditions:

Unknown

QAPP Information:

Unknown

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 78544, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

43970

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceed the criterion for Water Temperature.

Data Reference:

Statewide Perennial Streams Assessment 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Per "Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids" (Carter 2008): The lethal temperature evaluation guideline for both steelhead adult migration & holding and juvenile growth & rearing of 24°C applies in this water body July-October. The lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C and applies November-June in this water body. See LOE ID 31521 for more information on natural temperature alterations and salmonid presence and periodicity in this water body.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Outlet Creek - 111PS0008 ]

Temporal Representation:

Data was collected over the time period 9/9/2008-9/29/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation 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 78544, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

46803

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

The Upper Main Eel River and Tributaries (including Tomki Creek, Outlet Creek and Lake Pillsbury) TMDLs for Temperature and Sediment were approved by the USEPA on December 29, 2004. The TMDL concludes that anthropogenic alterations to riparian canopy have increased temperatures in the Upper Main HA. Modeling results reflect that current stream temperatures are elevated compared to stream temperatures under natural conditions, and improvement in riparian canopy is needed.

Data Reference:

Upper Main Eel River and Tributaries (including Tomki Creek, Outlet Creek and Lake Pillsbury) Total Maximum Daily Loads for Temperature and Sediment

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Information pertains to the Eel River HU, Upper Main HA (Includes Tomki Creek) water body.

Temporal Representation:

Data are reflective of current conditions in this water body.

Environmental Conditions:

QAPP Information:

Information is considered to be of adequate quality for the Integrated Report process.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 78544, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

43225

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Water Temperature.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 11/13/2007-7/15/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation 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 78544, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101022

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Rice Creek ~0.5mi above Rice Fork (111PS0110).

Temporal Representation:

The samples were collected between the dates of 6/9/2014.

Environmental Conditions:

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

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 78544, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101099

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Temperature. Data range from 8.9 - 16.4 degrees C.

Data Reference:

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

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Bucknell Creek above Eel River (111BN0329).

Temporal Representation:

The samples were collected between the dates of 8/27/2013 - 10/15/2013.

Environmental Conditions:

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

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 78544, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

133579

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

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

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Bucknell Creek above Eel River (111BN0329).

Temporal Representation:

The samples were collected between the dates of 11/7/2013 - 12/12/2013.

Environmental Conditions:

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

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 78544, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101018

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Blue Slides Creek above Bear Cr. (111FS0008).

Temporal Representation:

The samples were collected between the dates of 5/2/2012 - 6/7/2012.

Environmental Conditions:

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

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 78544, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101035

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Thistle Glade Creek ~1mi above Eel River (111TGCAER).

Temporal Representation:

The samples were collected between the dates of 7/24/2012.

Environmental Conditions:

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

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 78544, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101029

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Bear Creek ~1.2mi above Blue Slides Cr. (111FS0001).

Temporal Representation:

The samples were collected between the dates of 7/5/2011.

Environmental Conditions:

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

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 78544, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101030

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Blue Slides Creek above Bear Cr. (111FS0008).

Temporal Representation:

The samples were collected between the dates of 7/6/2011 - 7/19/2012.

Environmental Conditions:

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

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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


DECISION ID	103961	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	2,3,4,6-tetrachlorophenol
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 are available in the administrative record to assess this pollutant. None of the 2 samples exceed the objective for protection of 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. 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 2 samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 103961, 2,3,4,6-tetrachlorophenol	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

25591

Pollutant:

2,3,4,6-tetrachlorophenol

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the two 2,3,4,6-tetrachlorophenol samples collected in the Upper Mainstem Eel River watershed exceed the evaluation guideline. Both samples were detected but not quantified (with a reporting limit of 0.002 ug/l). The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008).

Data Reference:

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

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

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

Evaluation Guideline:

Per the "Quality Criteria for Water 1986" (USEPA 1986), also known as the Gold Book: The 2,3,4,6-tetrachlorophenol criterion to control undesirable taste and odor qualities of ambient water is estimated at 1.0 ug/l.

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:

Samples were collected from the Upper Mainstem Eel River near Hearst (SWAMP Station ID 111EELHST). Samples were collected from well-mixed flows in glides or riffles.

Temporal Representation:

Samples were collected from February 2002 to June 2002.

Environmental Conditions:

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

QAPP Information:

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

QAPP Information Reference(s):

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


DECISION ID	100909	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Aldicarb
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 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 100909, Aldicarb	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109584

Pollutant:

Aldicarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Aldicarb.

Data Reference:

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

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

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

Objective/Criterion Reference:

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

Evaluation Guideline:

The evaluation guideline for Aldicarb is the USEPA Aquatic Life Benchmark of 10 ug/L for an invertebrate (acute).

Guideline Reference:

OPP Aquatic Life Benchmarks

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 100909, Aldicarb	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109582

Pollutant:

Aldicarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

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

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The evaluation guideline for Aldicarb is the USEPA Aquatic Life Benchmark of 10 ug/L for an invertebrate (acute).

Guideline Reference:

OPP Aquatic Life Benchmarks

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 100909, Aldicarb	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109583

Pollutant:

Aldicarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

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

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for aldicarb incorporated by reference in the Water Quality Control Plan, North Coast Basin is 3 ug/L.

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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


DECISION ID	102594	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

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:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3 of the Listing Policy. Under section 3 a single line of evidence are necessary to assess listing status. Seven lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 102594, Aldrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121231

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Aldrin. Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

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

Evaluation Guideline:

National Academy of Science guidelines (NAS 1972) establish a maximum Aldrin concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 102594, Aldrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107643

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 SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Aldrin. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

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

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin criteria for the protection of human health from consumption of organisms only is 0.00014 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 102594, Aldrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121423

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:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 102594, Aldrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106415

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

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

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect of human health from the consumption of water and organisms is 0.00013 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 102594, Aldrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122590

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Aldrin, Total. Nine sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

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

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect of human health from the consumption of water and organisms is 0.00013 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

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

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

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

QAPP Information:

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

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 102594, Aldrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122591

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Aldrin, Total. One sample result was not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

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

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

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

QAPP Information:

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

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 102594, Aldrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118824

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:

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

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect aquatic life in freshwater as criterion maximum concentration is 3 ug/L . This established criteria was divided by 2 in order to better represent a CMC value as specified in footnote g of Table (b)(1) of the California Toxics Rule, 2000.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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


DECISION ID	103946	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

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. Under section 3.2 a single line of evidence is necessary to assess listing status. Twenty seven lines of evidence are available in the administrative record to assess this pollutant. Eleven out of five hundred seventy five samples exceed the objective for the COLD beneficial use(s). Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Eleven out of five hundred seventy five samples exceed the objective for the COLD beneficial use and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and 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 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117270

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 SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WE0816)

Temporal Representation:

The samples were collected between the dates of 2013-06-12 and 2013-06-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119155

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 Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 44 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2014-05-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

116289

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111PS0110)

Temporal Representation:

The samples were collected between the dates of 2014-06-09 and 2014-06-09

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

116311

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER003)

Temporal Representation:

The samples were collected between the dates of 2014-06-10 and 2014-06-10

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119156

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 Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 61 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

115815

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0001)

Temporal Representation:

The samples were collected between the dates of 2011-07-05 and 2011-07-05

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

108331

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113118

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 Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 70 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2014-10-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

108431

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0007)

Temporal Representation:

The samples were collected between the dates of 2011-07-11 and 2011-07-11

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102291

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 SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0008)

Temporal Representation:

The samples were collected between the dates of 2011-07-06 and 2012-07-19

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119157

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 Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 42 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2014-05-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111210

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 Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 2 of 61 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

116771

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 SWAMP Perennial Stream Surveys data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111PS0160)

Temporal Representation:

The samples were collected between the dates of 2011-07-25 and 2011-07-25

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106207

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 Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 2 of 51 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119151

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 Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 2 of 62 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119560

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 Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 54 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

103962

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102325

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111CBCAER)

Temporal Representation:

The samples were collected between the dates of 2013-08-08 and 2013-08-08

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119150

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 Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 51 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2014-05-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117292

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

108297

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111ERATRC)

Temporal Representation:

The samples were collected between the dates of 2012-10-10 and 2012-10-10

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118826

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

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

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106834

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109235

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 103946, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119152

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 Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 2 of 64 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	101972	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Ametryn
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 101972, Ametryn	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118857

Pollutant:

Ametryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

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

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ametryn as a drinking water level is a concentration of 0.06 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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


DECISION ID	104109	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Aminomethyl Phosphonic Acid (AMPA)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Two line(s) of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 104109, Aminomethyl Phosphonic Acid (AMPA)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118897

Pollutant:

Aminomethyl Phosphonic Acid (AMPA)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

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

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The evaluation guideline for AMPA is the USEPA Aquatic Life Benchmark of 249500 ug/L for a fish (acute).

Guideline Reference:

OPP Aquatic Life Benchmarks

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 104109, Aminomethyl Phosphonic Acid (AMPA)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118896

Pollutant:

Aminomethyl Phosphonic Acid (AMPA)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

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

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The evaluation guideline for AMPA is the USEPA Aquatic Life Benchmark of 249500 ug/L for a fish (acute).

Guideline Reference:

OPP Aquatic Life Benchmarks

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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


DECISION ID	79244	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Ammonia
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Pollutant name changed from "Nitrogen, ammonia (Total Ammonia)" to "Ammonia" This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Thirty-seven lines of evidence are available in the administrative record to assess this pollutant. Zero of 41 Ammonia as Nitrogen samples exceed the objective for the COLD beneficial use. Zero of 505 Ammonia (Unionized) samples exceed the objective for the MUN beneficial use. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the 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 41 Ammonia as Nitrogen samples exceed the objective for the COLD beneficial use. Zero of 505 Ammonia (Unionized) samples exceed the objective for the MUN beneficial use. These do 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 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

34511

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the samples exceed the water USEPA Temperature and pH-Dependent values of the CCC (Chronic Criterion) for Fish Early Life Stages Present for ammonia. 3 of the 4 data are reported as non-detect limits. These non-detect limits are less than or equal to the water quality standard, the value will be considered as meeting the water quality standard, objective, criterion, or evaluation guideline.

Data Reference:

RWB1 Trend Maintenance Periods FYs 2007 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Update of Ambient Water Quality Criteria for Ammonia (USEPA 1999): Where salmonids and fish early life stages are present, the 30-day average concentration (criterion continuous concentration or CCC) of total ammonia (as mg N/L) in freshwater are not to be exceeded more than once every three years on average. The CCC values are based on pH, temperature, and the presence of early life stages of fish. The CCC formula is found on p.83 and the table of CCC values are found on p.87.

Guideline Reference:

1999 Update of Ambient Water Quality Criteria for Ammonia

Spatial Representation:

Sample was collected at 111ER6140 (Eel River above Dos Rios).

Temporal Representation:

Samples collected between 11/13/2007 and 2/26/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114998

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0001)

Temporal Representation:

The samples were collected between the dates of 2011-07-05 and 2011-07-05

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111453

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0008)

Temporal Representation:

The samples were collected between the dates of 2011-07-06 and 2012-07-19

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114466

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111CBCAER)

Temporal Representation:

The samples were collected between the dates of 2013-08-08 and 2013-08-08

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

115760

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER003)

Temporal Representation:

The samples were collected between the dates of 2014-06-10 and 2014-06-10

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111569

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111ERATRC)

Temporal Representation:

The samples were collected between the dates of 2012-10-10 and 2012-10-10

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117490

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109172

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

103539

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WE0816)

Temporal Representation:

The samples were collected between the dates of 2013-06-12 and 2013-06-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111635

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0007)

Temporal Representation:

The samples were collected between the dates of 2011-07-11 and 2011-07-11

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118860

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

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

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113707

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111CBCAER)

Temporal Representation:

The samples were collected between the dates of 2013-08-08 and 2013-08-08

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

108364

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111ERATRC)

Temporal Representation:

The samples were collected between the dates of 2012-10-10 and 2012-10-10

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107631

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER003)

Temporal Representation:

The samples were collected between the dates of 2014-06-10 and 2014-06-10

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110656

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WE0816)

Temporal Representation:

The samples were collected between the dates of 2013-06-12 and 2013-06-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110531

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0001)

Temporal Representation:

The samples were collected between the dates of 2011-07-05 and 2011-07-05

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114632

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0008)

Temporal Representation:

The samples were collected between the dates of 2011-07-06 and 2011-07-06

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118861

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

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

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-11-07

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102697

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 38 samples exceeded the water quality standard for Ammonia as NH3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-05-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112927

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 49 samples exceeded the water quality standard for Ammonia as NH3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119426

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 54 samples exceeded the water quality standard for Ammonia as NH3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111254

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Ammonia as NH3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-05-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107010

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 57 samples exceeded the water quality standard for Ammonia as NH3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107008

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 55 samples exceeded the water quality standard for Ammonia as NH3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107157

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 64 samples exceeded the water quality standard for Ammonia as NH3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2014-10-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112926

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 46 samples exceeded the water quality standard for Ammonia as NH3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-05-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119196

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 56 samples exceeded the water quality standard for Ammonia as NH3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107113

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 46 samples exceeded the water quality standard for Ammonia as NH3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

26311

Pollutant:

Ammonia as Nitrogen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 41 ammonia as nitrogen samples collected from Upper Mainstem Eel River exceed the objective. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008).

Data Reference:

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

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

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

Objective/Criterion Reference:

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

Evaluation Guideline:

Per the National Recommended Water Quality Criteria (USEPA 2006): The 1-hour average concentration (acute criterion or CMC) of total ammonia nitrogen (in mg N/L) for freshwater where salmonid fish are present, which is not to be exceeded more than once every three years on average, is calculated using the following equation: CMC=0.275/(1+10^(7.204 - pH)) + 39.0/(1+10^(pH - 7.204)).

Guideline Reference:

Spatial Representation:

Samples were collected from the Upper Mainstem Eel River at 3 locations as follows: (1) downstream of Van Arsdale Reservoir (SWAMP Station ID 111EELVAN), (2) near Hearst (SWAMP Station ID 111EELHST), and (3) above Dos Rios (SWAMP Station ID 111EELMAN). Samples were collected from well-mixed flows in glides or riffles.

Temporal Representation:

At the Van Arsdale site, samples were collected from February 2002 to April 2005. At the Hearst site, samples were collected from February 2002 to June 2002. At the Dos Rios site, samples were collected from March 2001 to June 2006. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.

Environmental Conditions:

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

QAPP Information:

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

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

115009

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0001)

Temporal Representation:

The samples were collected between the dates of 2011-07-05 and 2011-07-05

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114954

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111CBCAER)

Temporal Representation:

The samples were collected between the dates of 2013-08-08 and 2013-08-08

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

104551

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WE0816)

Temporal Representation:

The samples were collected between the dates of 2013-06-12 and 2013-06-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113245

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER003)

Temporal Representation:

The samples were collected between the dates of 2014-06-10 and 2014-06-10

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

34574

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the samples exceed the water USEPA Temperature and pH-Dependent values of the CCC (Chronic Criterion) for Fish Early Life Stages Present for ammonia. Both data are reported as quantitation limits. These quantitation limits are less than or equal to the water quality standard, the value will be considered as meeting the water quality standard, objective, criterion, or evaluation guideline.

Data Reference:

Statewide Perennial Streams Assessment 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

1999 Update of Ambient Water Quality Criteria for Ammonia

Spatial Representation:

Samples were collected at 111PS0008 (Outlet Creek).

Temporal Representation:

Samples were collected on 9/9/2008 and 9/29/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111646

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0008)

Temporal Representation:

The samples were collected between the dates of 2011-07-06 and 2011-07-06

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118859

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

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

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-11-07

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 79244, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110487

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111ERATRC)

Temporal Representation:

The samples were collected between the dates of 2012-10-10 and 2012-10-10

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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


DECISION ID	101710	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Antimony
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	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. Eighty lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

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

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107067

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106256

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119396

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110958

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102554

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110969

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110960

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114375

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110944

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114367

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110965

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110978

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110949

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106245

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106239

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106250

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110952

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107023

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105526

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110968

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106226

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 41 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114386

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 28 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113201

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. 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 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102460

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112988

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113199

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 33 samples were collected, 33 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113202

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 46 samples were collected, 46 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119555

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 40 samples were collected, 40 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119496

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 40 samples were collected, 40 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106234

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113069

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111261

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105501

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102582

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 42 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102494

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 39 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114366

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113060

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110972

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102576

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105497

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119203

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106257

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119805

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102512

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106242

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102449

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106196

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111023

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 14 samples were collected, 14 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102599

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113205

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113191

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 40 samples were collected, 40 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119583

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102541

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106186

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 44 samples were collected, 44 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113011

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 35 samples were collected, 35 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102455

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 33 samples were collected, 33 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119511

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 47 samples were collected, 47 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102495

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119573

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113126

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106309

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 47 samples were collected, 47 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113214

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 46 samples were collected, 46 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102606

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 39 samples were collected, 39 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102521

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 40 samples were collected, 40 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107134

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111277

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111011

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107088

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112897

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102545

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111007

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119561

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111021

Pollutant:

Antimony

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 Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106277

Pollutant:

Antimony

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 Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110979

Pollutant:

Antimony

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 Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106293

Pollutant:

Antimony

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 Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 28 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110981

Pollutant:

Antimony

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 Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117148

Pollutant:

Antimony

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 Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 41 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119529

Pollutant:

Antimony

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 Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113089

Pollutant:

Antimony

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 Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107147

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119447

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119539

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 45 samples were collected, 45 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 Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111018

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

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(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 101710, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117200

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline: