# Final 2008 California 303(d)/305(b) Integrated Report

# Supporting Information

## Regional Board 5 - Central Valley Region

Water Body Name: | Mokelumne River, North Fork
Water Body ID: | CAR5326001420041208150818
Water Body Type: | River & Stream

DECISION ID | 10182
Pollutant: | Arsenic
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
Weight of Evidence: | This pollutant is being considered for listing under sections 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Data is available from 2 lines of evidence for this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification for placing this water segment-pollution combination on the section 303(d) list. The recommendation is based on staff findings that 0 of 2 available concentrations exceeded the USEPA Primary MCL and this does not exceed the allowable frequency using Table 3.1 of the Listing Policy. The recommendation is based on staff findings that 0 of 2 available concentrations exceeded the California Toxics Rule and this does not exceed the allowable frequency using Table 3.1 of the Listing Policy. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
RWQCB Board Decision / Staff Recommendation: | After review of 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.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 10182

LOE ID: | 20553
Pollutant: | Arsenic
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Municipal & Domestic Supply
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Neither of the 2 samples collected by the Surface Water Ambient Monitoring Program exceeded the USEPA Primary MCL of 10 ug/L for total arsenic
Data Reference: | San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows
Water Quality Objective/Criterion: | Total arsenic levels must not exceed the USEPA Primary MCL of 10 ug/L
Objective/Criterion Reference: | California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring. http://www.cdph.ca.gov/certlic/drinkingwater/Pages/Lawbook.aspx
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected from the North Fork Mokelumne River at Hwy 26
Temporal Representation: | The samples were collected on June 13, 2002 and June 26, 2002
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
LOE ID: | 6268
Pollutant: | Arsenic
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Not Specified
Data Used to Assess Water Quality: | Neither of the 2 samples collected by the Surface Water Ambient Monitoring Program exceeded the CTR level of 340 ug/L for dissolved arsenic
Data Reference: | San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows
Water Quality Objective/Criterion: | Dissolved arsenic levels should not exceed the CTR 1-hour average maximum concentration of 340 ug/L
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: | Samples were collected from the North Fork Mokelumne River at Hwy 26 and at Hwy 27
Temporal Representation: | The samples were collected on June 13, 2002 and on June 26, 2002
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):

DECISION ID | 10183
Pollutant: | Cadmium
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
Weight of Evidence: | "This pollutant is being considered for listing under sections 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Data is available from 2 lines of evidence for this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification for placing this water segment-pollution combination on the section 303(d) list. The recommendation is based on staff findings that 0 of 2 available concentrations exceeded the California Toxics Rule for Cold Freshwater Habitat and this does not exceed the allowable frequency using Table 3.1 of the Listing Policy. The recommendation is also based on staff findings that 0 of 2 available concentrations exceeded the Department of Public Health Primary MCL for Municipal & Domestic Supply and this does not exceed the allowable frequency using Table 3.1 of the Listing Policy. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met."
RWQCB Board Decision / Staff Recommendation: | After review of 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.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 10183

LOE ID: | 20591
Pollutant: | Cadmium
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Municipal & Domestic Supply
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | neither of the 2 samples collected by the Surface Water Ambient Monitoring Program exceeded the California Primary MCL of 5 ug/L for total cadmium
Data Reference: | San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows
Water Quality Objective/Criterion: | Total cadmium levels should not exceed the California Department of Public Health Primary MCL of 5 ug/L
Objective/Criterion Reference: | California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring. http://www.cdph.ca.gov/certlic/drinkingwater/Pages/Lawbook.aspx
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected from the North Fork Mokelumne River at Highway 26
Temporal Representation: | The samples were collected on June 13, 2002 and June 26, 2002
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
LOE ID: | 6270
Pollutant: | Cadmium
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Not Specified
Data Used to Assess Water Quality: | Neither of the 2 samples collected by the Surface Water Ambient Monitoring Program exceeded the calculated CTR criterion for dissolved cadmium
Data Reference: | San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows
Water Quality Objective/Criterion: | Dissolved cadmium levels should not exceed the calculated limit based on the formula: Criteria Maximum Concentration (1-hour Average dissolved)=(EXP(1.128*LN(hardness)-3.6867))*(1.136672-(LN(hardness)*0.041838))
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: | Samples were collected from the North Fork Mokelumne River at Highway 26
Temporal Representation: | The samples were collected on June 13, 2002 and June 26, 2002
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):

DECISION ID | 10184
Pollutant: | Chromium (total)
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
Weight of Evidence: | This pollutant is being considered for listing under sections 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Data is available from 1 line of evidence for this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification for placing this water segment-pollution combination on the section 303(d) list. The recommendation is based on staff findings that 0 of 2 available concentrations exceeded the water quality objective and this does not exceed the allowable frequency using Table 3.1 of the Listing Policy. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
RWQCB Board Decision / Staff Recommendation: | After review of 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.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 10184

LOE ID: | 20586
Pollutant: | Chromium (total)
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Municipal & Domestic Supply
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Zero of the 2 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for Chromium.
Data Reference: | San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows
Water Quality Objective/Criterion: | All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. (CRWQCB, 2006)
Objective/Criterion Reference: | Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region
Evaluation Guideline: | Chromium levels should not exceed 50 ug/L (Department of Public Health Primary MCL).
Guideline Reference: | California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring. http://www.cdph.ca.gov/certlic/drinkingwater/Pages/Lawbook.aspx
Spatial Representation: | Samples were collected at N.Fork Mokelumne River @ Hwy 26.
Temporal Representation: | The samples were collected from June 13 2002 to June 26 2002.
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):

DECISION ID | 5234
Pollutant: | Copper
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2006)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Weight of Evidence: | This pollutant is being considered for listing under sections 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Data is available from 2 lines of evidence for this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification for placing this water segment-pollution combination on the section 303(d) list. The recommendation is based on staff findings that 0 of 2 available concentrations exceeded the California Toxics Rule for Cold Freshwater Habitat and this does not exceed the allowable frequency using Table 3.1 of the Listing Policy. The recommendation is also based on staff findings that 0 of 2 available concentrations exceeded the Department of Public Health Primary MCL for Municipal & Domestic Supply and this does not exceed the allowable frequency using Table 3.1 of the Listing Policy. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
RWQCB Board Decision / Staff Recommendation: | After review of 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.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 5234

LOE ID: | 20657
Pollutant: | Copper
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Municipal & Domestic Supply
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | None of the 2 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for Copper.
Data Reference: | San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows
Water Quality Objective/Criterion: | Copper levels should not exceed 1300 ug/L (Department of Public Health Primary MCL).
Objective/Criterion Reference: | California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring. http://www.cdph.ca.gov/certlic/drinkingwater/Pages/Lawbook.aspx
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected at N.Fork Mokelumne River @ Hwy 26.
Temporal Representation: | The samples were collected from June 13, 2002 to June 26, 2002.
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
LOE ID: | 20658
Pollutant: | Copper
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Municipal & Domestic Supply
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | None of the 2 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for Copper.
Data Reference: | San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows
Water Quality Objective/Criterion: | Copper levels should not exceed 1300 ug/L (Department of Public Health Primary MCL).
Objective/Criterion Reference: | Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region
| California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring. http://www.cdph.ca.gov/certlic/drinkingwater/Pages/Lawbook.aspx
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected at N.Fork Mokelumne River @ Hwy 26.
Temporal Representation: | The samples were collected from June 13, 2002 to June 26, 2002.
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
LOE ID: | 6272
Pollutant: | Copper
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | None of the 2 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for Copper.
Data Reference: | San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows
Water Quality Objective/Criterion: | Dissolved Copper levels should not exceed calculated limit based on the formula: Criteria Maximum Concentration (1-hour Average, dissolved)=(EXP(0.9422*LN(hardness)-1.7))*(0.96) (CTR)
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: | Samples were collected at N.Fork Mokelumne River @ Hwy 26.
Temporal Representation: | The samples were collected from June 13, 2002 to June 26, 2002
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
LOE ID: | 2708
Pollutant: | Copper
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 23
Number of Exceedances: | 2
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Two out of 23 samples exceeded the criteria. The measurements were made using two different approaches. One set of samples had a higher quantitation limit of 0.5 ug/L. The other set of samples had a lower quantitation limit of 0.03 ug/L. Only two of the higher quantitation limit level samples could be used for this assessment. These were the two samples that were in exceedance of the criteria. Historical Water Quality Results for Analytical Laboratory Measurements PG&E Company Mokelumne River Project (FERC 137) [Table A2] (PG&E, 2003b).
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | Hardness based criteria from USEPA (CTR) ranged from 2.65 ug/L to 0.43 ug/L.
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Three stations along the north fork, NFMR2, NFMR3, and NFMR5.
Temporal Representation: | Samples taken between 3/14/2001 to 12/07/2005.
Environmental Conditions: |
QAPP Information: | Well documented QA/QC including report on certified analytical reports and Chain-of-Custody documentation.
QAPP Information Reference(s):

DECISION ID | 13741
Pollutant: | Escherichia coli (E. Coli)
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
Weight of Evidence: | This pollutant is being considered for placement on the 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. One lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the water quality 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 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 18 samples exceeded the fecal coliform objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. According to table 3.2, a minimum sample size of 26 is required to designate a fully supporting use rating. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
RWQCB Board Decision / Staff Recommendation: | After review of 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.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 13741

LOE ID: | 23176
Pollutant: | Escherichia coli (E. Coli)
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Water Contact Recreation
Number of Samples: | 18
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | The Central Valley Regional Water Quality Control Board Surface Water Ambient Monitoring Program collected 18 samples from March 2002 to December 2002. Zero out of 18 samples exceeded the evaluation objective.
Data Reference: | Monitoring Data from the Surface Water Ambient Monitoring Program (SWAMP), San Joaquin River Basin - 2007 Data Review
Water Quality Objective/Criterion: | All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. The objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances.
Objective/Criterion Reference: | Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region
| Ambient Water Quality Criteria for Bacteria - 1986. EPA440/5-84-002
Evaluation Guideline: | The USEPA E. Coli objective of 235/100 mL in any single sample (USEPA 1986).
Guideline Reference: | Ambient Water Quality Criteria for Bacteria - 1986. EPA440/5-84-002
Spatial Representation: | Samples were collected at Mokelumne River, North Fork.
Temporal Representation: | Sampling occurred from March 2002 to December 2002.
Environmental Conditions: |
QAPP Information: | Data quality: Good. Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s): | Quality Assurance Management 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 | 5205
Pollutant: | Fecal Coliform
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)(2006)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Weight of Evidence: | This pollutant is being considered for placement on the 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. One lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the water quality 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 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 44 samples exceeded the fecal coliform objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
RWQCB Board Decision / Staff Recommendation: | After review of 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.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 5205

LOE ID: | 2706
Pollutant: | Fecal Coliform
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Water Contact Recreation
Number of Samples: | 15
Number of Exceedances: | 0
Data and Information Type: | PATHOGEN MONITORING
Data Used to Assess Water Quality: | Zero out of 15 samples at this location exceeded the standard for fecal coliform. Historical Water Quality Results for Analytical Laboratory Measurements PG& E Company Mokelumne River Project (FERC 137) [Table A2]. (PG&E, 2003b).
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | In waters designated for contact recreation (REC 1), the fecal coliform concentration based on a minimum of not less than 5 samples for any 30-day period shall not exceed a geometric mean of 200/100 ml, nor shall more than 10 percent of the total number of samples during any 30-day period exceed 400/100 ml - (Central Valley RWQCBs Water Quality Control Plan [Basin Plan]).
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Location: NFMR below Electra Diversion Dam (NFMR5*). Rationale: Defines water quality in the NFMR at the head of the reach between Electra Diversion Dam and Electra Powerhouse, and is representative of water quality in the reach between Tiger Creek Afterbay Dam and Electra Diversion Dam.
Temporal Representation: | Samples taken between 7/26/2000 and 5/14/2002.
Environmental Conditions: |
QAPP Information: | Well documented QA/QC including 174 page report on Certified Analytical Reports and Chain-of-Custody Documentation.
QAPP Information Reference(s):
LOE ID: | 23178
Pollutant: | Fecal Coliform
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Water Contact Recreation
Number of Samples: | 44
Number of Exceedances: | 0
Data and Information Type: | PATHOGEN MONITORING
Data Used to Assess Water Quality: | Historical Water Quality Results for Analytical Laboratory Measurements 590 PG&E Company Mokelumne River Project (FERC 137, PG&E, 2003) collected 44 samples from July 2000 to May 2002. Zero out of 4 samples exceeded evaluation objective.
Data Reference: | Mokelumne River Project (FERC 137) and Mokelumne Watershed correspondence and reports
Water Quality Objective/Criterion: | All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. The objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances.
Objective/Criterion Reference: | Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region
Evaluation Guideline: | The fecal coliform concentration of 400/100ml based on the geometric mean each month.
Guideline Reference: | Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region
Spatial Representation: | Samples were collected at three locations on the North Fork of the Mokelumne River: NFMR2, NFMR3, and NFMR5.
Temporal Representation: | Sampling occurred from July 2000 to May 2002.
Environmental Conditions: |
QAPP Information: | Data quality: Good. Well documented QA/QC including report on Certified Analytical Reports and chain-of-custody documentation.
QAPP Information Reference(s):
LOE ID: | 2704
Pollutant: | Fecal Coliform
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Water Contact Recreation
Number of Samples: | 14
Number of Exceedances: | 0
Data and Information Type: | PATHOGEN MONITORING
Data Used to Assess Water Quality: | Zero out of 14 samples at this location exceeded the standard for fecal coliform. Historical Water Quality Results for Analytical Laboratory Measurements PG& E Company Mokelumne River Project (FERC 137) [Table A2]. (PG&E, 2003b).
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | In waters designated for contact recreation (REC 1), the fecal coliform concentration based on a minimum of not less than 5 samples for any 30-day period shall not exceed a geometric mean of 200/100 ml, nor shall more than 10 percent of the total number of samples during any 30-day period exceed 400/100 ml - (Central Valley RWQCBs Water Quality Control Plan [Basin Plan]).
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Location: NFMR below Salt Springs Reservoir Dam (NFMR2*). Rationale: Defines water quality in the NFMR at the head of the reach between Salt Springs Reservoir Dam and Tiger Creek Afterbay.
Temporal Representation: | Samples taken between 7/26/2000 and 5/14/2002 (none more than 2 months apart).
Environmental Conditions: |
QAPP Information: | Well documented QA/QC including 174 page report on Certified Analytical Reports and Chain-of-Custody Documentation.
QAPP Information Reference(s):
LOE ID: | 2707
Pollutant: | Fecal Coliform
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Water Contact Recreation
Number of Samples: | 15
Number of Exceedances: | 0
Data and Information Type: | PATHOGEN MONITORING
Data Used to Assess Water Quality: | Zero out of 15 samples at this location exceeded the standard for fecal coliform. Historical Water Quality Results for Analytical Laboratory Measurements PG& E Company Mokelumne River Project (FERC 137) [Table A2]. (PG&E, 2003ab).
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | In waters designated for contact recreation (REC 1), the fecal coliform concentration based on a minimum of not less than 5 samples for any 30-day period shall not exceed a geometric mean of 200/100 ml, nor shall more than 10 percent of the total number of samples during any 30-day period exceed 400/100 ml - (Central Valley RWQCBs Water Quality Control Plan [Basin Plan]).
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Location: Mokelumne River above Electra Powerhouse (MR1*). Rationale: Defines water quality in the Mokelumne River at the end of the reach between Electra Diversion Dam and Electra Powerhouse.
Temporal Representation: | Sample taken between 7/26/2000 and 5/14/2002.
Environmental Conditions: |
QAPP Information: | Well documented QA/QC including 174 page report on Certified Analytical Reports and Chain-of-Custody Documentation.
QAPP Information Reference(s):
LOE ID: | 2705
Pollutant: | Fecal Coliform
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Water Contact Recreation
Number of Samples: | 15
Number of Exceedances: | 0
Data and Information Type: | PATHOGEN MONITORING
Data Used to Assess Water Quality: | Zero out of 15 samples at this location exceeded the standard for fecal coliform. Historical Water Quality Results for Analytical Laboratory Measurements PG& E Company Mokelumne River Project (FERC 137) [Table A2]. (PG&E, 2003b).
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | In waters designated for contact recreation (REC 1), the fecal coliform concentration based on a minimum of not less than 5 samples for any 30-day period shall not exceed a geometric mean of 200/100 ml, nor shall more than 10 percent of the total number of samples during any 30-day period exceed 400/100 ml - (Central Valley RWQCBs Water Quality Control Plan [Basin Plan]).
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Location: NFMR above Tiger Creek Afterbay at Licensee gage M-38 (NMFR3*). Rationale: Defines water quality in the NFMR at the end of the reach between Salt Springs Reservoir Dam and Tiger Creek Afterbay.
Temporal Representation: |
Environmental Conditions: |
QAPP Information: | Well documented QA/QC including 174 page report on Certified Analytical Reports and Chain-of-Custody Documentation.
QAPP Information Reference(s):

DECISION ID | 10186
Pollutant: | Lead
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
Weight of Evidence: | "This pollutant is being considered for listing under sections 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Data is available from 2 lines of evidence for this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification for placing this water segment-pollution combination on the section 303(d) list. The recommendation is based on staff findings that 0 of 2 available concentrations exceeded the California Toxics Rule for Cold Freshwater Habitat and this does not exceed the allowable frequency using Table 3.1 of the Listing Policy. The recommendation is also based on staff findings that 0 of 2 available concentrations exceeded the Department of Public Health Primary MCL for Municipal & Domestic Supply and this does not exceed the allowable frequency using Table 3.1 of the Listing Policy. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met."
RWQCB Board Decision / Staff Recommendation: | After review of 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.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 10186

LOE ID: | 6276
Pollutant: | Lead
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Not Specified
Data Used to Assess Water Quality: | Neither of the 2 samples collected by the Surface Water Ambient Monitoring Program exceeded the calculated CTR CMC for dissolved lead
Data Reference: | San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows
Water Quality Objective/Criterion: | Dissolved lead levels should not exceed the calculated CTR value based on the formula: Criteria Maximum Concentration (1-hour Average, dissolved)=(EXP(1.273*LN(hardness)-1.46))*(1.46203-(LN(hardness)*0.145712))
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: | Samples were collected from the North Fork of the Mokelumne River atHwy 26
Temporal Representation: | The samples were collected on June 13, 2002 and on June 26, 2002
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
LOE ID: | 20635
Pollutant: | Lead
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Municipal & Domestic Supply
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Neither of the 2 samples collected by the Surface Water Ambient Monitoring Program exceeded the Primary MCL of 15 ug/L for total lead
Data Reference: | San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows
Water Quality Objective/Criterion: | Total lead levels should not exceed 15 ug/L (Department of Public Health Primary MCL)
Objective/Criterion Reference: | California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring. http://www.cdph.ca.gov/certlic/drinkingwater/Pages/Lawbook.aspx
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected from the North Fork, Mokelumne River at Hwy 26
Temporal Representation: | The samples were collected on June 13, 2002 and on June 26, 2002
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):

DECISION ID | 10188
Pollutant: | Nickel
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
Weight of Evidence: | "This pollutant is being considered for listing under sections 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Data is available from 2 lines of evidence for this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification for placing this water segment-pollution combination on the section 303(d) list. The recommendation is based on staff findings that 0 of 2 available concentrations exceeded the California Toxics Rule for Cold Freshwater Habitat and this does not exceed the allowable frequency using Table 3.1 of the Listing Policy. The recommendation is also based on staff findings that 0 of 2 available concentrations exceeded the Department of Public Health Primary MCL for Municipal & Domestic Supply and this does not exceed the allowable frequency using Table 3.1 of the Listing Policy. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met."
RWQCB Board Decision / Staff Recommendation: | After review of 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.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 10188

LOE ID: | 6284
Pollutant: | Nickel
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Not Specified
Data Used to Assess Water Quality: | Zero of the 2 samples collected by the Surface Water Ambient Monitoring Program exceeded the calculated CTR for dissolved nickel
Data Reference: | San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows
Water Quality Objective/Criterion: | Dissolved nickel levels should not exceed the calculated CTR limit based on the formula: Criteria Maximum Concentration (1-hour Average, dissolved)=(EXP(0.846*LN(hardness)+2.255))*(0.998)
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: | Samples were collected from the North Fork Mokelumne River at Hwy 26 and at Hwy 27
Temporal Representation: | The samples were collected on June 13, 2002 and on June 26, 2002
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
LOE ID: | 20693
Pollutant: | Nickel
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Municipal & Domestic Supply
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Neither of the 2 samples collected by the Surface Water Ambient Monitoring Program exceeded the Primary MCL of 100 ug/L for total nickel
Data Reference: | San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows
Water Quality Objective/Criterion: | Total nickel levels should not exceed 100 ug/L (Department of Public Health Primary MCL)
Objective/Criterion Reference: | California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring. http://www.cdph.ca.gov/certlic/drinkingwater/Pages/Lawbook.aspx
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected from the North Fork Mokelumne River at Hwy 26 and at Hwy 27
Temporal Representation: | The samples were collected on June 13, 2002 and on June 26, 2002
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):

DECISION ID | 10189
Pollutant: | Nitrate as Nitrate (NO3)
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
Weight of Evidence: | This pollutant is being considered for listing under sections 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Data is available from 2 lines of evidence for this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification for placing this water segment-pollution combination on the section 303(d) list. The recommendation is based on staff findings that 0 of 2 available concentrations exceeded the USEPA Primary MCL and this does not exceed the allowable frequency using Table 3.1 of the Listing Policy. The recommendation is based on staff findings that 0 of 2 available concentrations exceeded the USEPA National Ambient Water Quality Objective and this does not exceed the allowable frequency using Table 3.1 of the Listing Policy. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
RWQCB Board Decision / Staff Recommendation: | After review of 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.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 10189

LOE ID: | 6285
Pollutant: | Nitrate as Nitrate (NO3)
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Not Specified
Data Used to Assess Water Quality: | 0 of the 2 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation guideline for Nitrate-N.
Data Reference: | San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows
Water Quality Objective/Criterion: | All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. (CRWQCB, 2006)
Objective/Criterion Reference: | National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology. 4304T The Blue Book
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected at N.Fork Mokelumne River @ Hwy 26.
Temporal Representation: | The samples were collected from Jun 13 2002 to Jun 26 2002
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
LOE ID: | 20754
Pollutant: | Nitrate as Nitrate (NO3)
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Municipal & Domestic Supply
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | 0 of the 2 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for Nitrate-N.
Data Reference: | San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows
Water Quality Objective/Criterion: | All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. (CRWQCB, 2006)
Objective/Criterion Reference: | Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region
Evaluation Guideline: | Nitrate-N levels should not exceed 45 mg/L (Department of Public Health Primary MCL)
Guideline Reference: | California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring. http://www.cdph.ca.gov/certlic/drinkingwater/Pages/Lawbook.aspx
Spatial Representation: | Samples were collected at N.Fork Mokelumne River @ Hwy 26.
Temporal Representation: | The samples were collected from Jun 13 2002 to Jun 26 2002
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):

DECISION ID | 5185
Pollutant: | Oxygen, Dissolved
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)(2006)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Weight of Evidence: | This pollutant is being considered for placement on the 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. One lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the water quality 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 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 25 samples fell below the minimum criterion specified in the Basin Plan and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
RWQCB Board Decision / Staff Recommendation: | After review of 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.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 5185

LOE ID: | 6273
Pollutant: | Oxygen, Dissolved
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 25
Number of Exceedances: | 0
Data and Information Type: | Not Specified
Data Used to Assess Water Quality: | 0 of the 25 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for Dissolved Oxygen.
Data Reference: | San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows
Water Quality Objective/Criterion: | The Basin Plan Objective sets the minimum Dissolved Oxygen content at 7 mg/L
Objective/Criterion Reference: | Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected at N.Fork Mokelumne River @ Hwy 26.
Temporal Representation: |
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
LOE ID: | 2702
Pollutant: | Oxygen, Dissolved
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 21
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Zero out of 21 samples at this location had a DO concentration below 7.0 mg/L. Year 2003 and Historical Water Quality Results for In Situ Measurements PG& E Company Mokelumne River Project (FERC 137) [Table A1]. (PG&E, 2003b).
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | Dissolved Oxygen (DO) concentrations shall not be reduced below 7.0 mg/L (for waters designated as COLD). From the Central Valley Regional Water Quality Control Boards Water Quality Control Plan (Basin Plan).
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Location: NFMR below Electra Diversion Dam (NFMR5*). Rationale: Defines water quality in the NFMR at the head of the reach between Electra Diversion Dam and Electra Powerhouse, and is representative of water quality in the reach between Tiger Creek Afterbay Dam and Electra Diversion Dam.
Temporal Representation: |
Environmental Conditions: |
QAPP Information: | Well documented QA/QC including 174 page report on Certified Analytical Reports and Chain-of-Custody Documentation.
QAPP Information Reference(s):
LOE ID: | 2703
Pollutant: | Oxygen, Dissolved
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 24
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Zero out of 24 samples at this location had a DO concentration below 7.0 mg/L. Year 2003 and Historical Water Quality Results for In Situ Measurements PG& E Company Mokelumne River Project (FERC 137) [Table A1]. (PG&E, 2003b).
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | Dissolved Oxygen (DO) concentrations shall not be reduced below 7.0 mg/L (for waters designated as COLD)-From the Central Valley Regional Water Quality Control Boards Water Quality Control Plan (Basin Plan).
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Location: Mokelumne River above Electra Powerhouse (MR1*). Rationale: Defines water quality in the Mokelumne River at the end of the reach between Electra Diversion Dam and Electra Powerhouse.
Temporal Representation: | Sample taken between 7/26/2000 and 9/11/2003.
Environmental Conditions: |
QAPP Information: | Well documented QA/QC including 174 page report on Certified Analytical Reports and Chain-of-Custody Documentation.
QAPP Information Reference(s):
LOE ID: | 2701
Pollutant: | Oxygen, Dissolved
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 22
Number of Exceedances: | 1
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | One out of 22 samples at this location had a DO concentration below 7.0 mg/L. Year 2003 and Historical Water Quality Results for In Situ Measurements PG& E Company Mokelumne River Project (FERC 137) [Table A1]. (PG&E, 2003b).
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | Dissolved Oxygen (DO) concentrations shall not be reduced below 7.0 mg/L (for waters designated as COLD)-From the Central Valley Regional Water Quality Control Boards Water Quality Control Plan (Basin Plan).
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Location: NFMR above Tiger Creek Afterbay at Licensee gage M-38 (NMFR3*). Rationale: Defines water quality in the NFMR at the end of the reach between Salt Springs Reservoir Dam and Tiger Creek Afterbay
Temporal Representation: |
Environmental Conditions: |
QAPP Information: | Well documented QA/QC including 174 page report on Certified Analytical Reports and Chain-of-Custody Documentation.
QAPP Information Reference(s):
LOE ID: | 2700
Pollutant: | Oxygen, Dissolved
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 21
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Zero out of 21 samples at this location had a DO concentration below 7.0 mg/L. Year 2003 and Historical Water Quality Results for In Situ Measurements PG& E Company Mokelumne River Project (FERC 137) [Table A1]. (PG&E, 2003b).
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | Dissolved Oxygen (DO) concentrations shall not be reduced below 7.0 mg/L (for waters designated as COLD)-From the Central Valley Regional Water Quality Control Boards Water Quality Control Plan (Basin Plan).
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Location: NFMR below Salt Springs Reservoir Dam (NFMR2*). Rationale: Defines water quality in the NFMR at the head of the reach between Salt Springs Reservoir Dam and Tiger Creek Afterbay.
Temporal Representation: | Samples taken between 7/26/2000 and 9/10/2003 (none more than 2 months apart).
Environmental Conditions: |
QAPP Information: | Well documented QA/QC including 174 page report on Certified Analytical Reports and Chain-of-Custody Documentation.
QAPP Information Reference(s):

DECISION ID | 10190
Pollutant: | Selenium
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
Weight of Evidence: | This pollutant is being considered for listing under sections 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Data is available from 2 lines of evidence for this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification for placing this water segment-pollution combination on the section 303(d) list. The recommendation is based on staff findings that only 1 sample is available and a minimum of 2 samples is needed for evaluation under section 3.1 for the Municipal Beneficial Use and for the Cold Water Habitat. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
RWQCB Board Decision / Staff Recommendation: | After review of 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 it cannot be determined if applicable water quality standards are not being exceeded.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 10190

LOE ID: | 6942
Pollutant: | Selenium
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | Not Specified
Data Used to Assess Water Quality: | Zero of the 1 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for Selenium.
Data Reference: | San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows
Water Quality Objective/Criterion: | All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. (CRWQCB, 2006) Selenium levels should not to exceed 5 ug/L (CTR)
Objective/Criterion Reference: | Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected at N.Fork Mokelumne River @ Hwy 26.
Temporal Representation: | The samples were collected from Oct 24 2002 to Oct 24 2002
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
LOE ID: | 20345
Pollutant: | Selenium
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Municipal & Domestic Supply
Number of Samples: | 1
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | 0 of the 1 sample was collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for Selenium.
Data Reference: | San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows
Water Quality Objective/Criterion: | All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. (CRWQCB, 2006)
Objective/Criterion Reference: | Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region
Evaluation Guideline: | Selenium levels should not exceed 50 ug/L (Department of Public Health Primary MCL)
Guideline Reference: | California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring. http://www.cdph.ca.gov/certlic/drinkingwater/Pages/Lawbook.aspx
Spatial Representation: | Sample was collected at N.Fork Mokelumne River @ Hwy 26.
Temporal Representation: | The sample was collected on Oct 24 2002
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):

DECISION ID | 10191
Pollutant: | Specific Conductivity
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
Weight of Evidence: | This pollutant is being considered for listing under sections 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Data is available from 1 line of evidence for this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification for placing this water segment-pollution combination on the section 303(d) list. The recommendation is based on staff findings that 0 of 25 available concentrations exceeded the water quality objective and this does not exceed the allowable frequency using Table 3.2 of the Listing Policy. Table 3.2 of the listing policy recommends listing if a sample size of 25 has 5 or more samples that exceed the evaluation criteria. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
RWQCB Board Decision / Staff Recommendation: | After review of 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.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 10191

LOE ID: | 20836
Pollutant: | Specific Conductivity
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Municipal & Domestic Supply
Number of Samples: | 25
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | None of the 25 samples collected by the Surface Water Ambient Monitoring Program exceeded the "recommended" Secondary MCL of 900 uS/cm for electrical conductivity
Data Reference: | San Joaquin River SWAMP Monitoring Data - Northeast Basin
Water Quality Objective/Criterion: | The secondary MCLs for electrical conductivity provide a range of values including a recommended level (900 uS/cm), upper level (1600 uS/cm) and a short-term level (2200 uS/cm). The recommended level of 900 uS/cm was used as it is intended to be protective of all drinking water uses
Objective/Criterion Reference: | California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring. http://www.cdph.ca.gov/certlic/drinkingwater/Pages/Lawbook.aspx
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected from the North Fork Mokelumne River at Hwy 26
Temporal Representation: | The samples were collected between January 9, 2002 and December 23, 2002
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):

DECISION ID | 10192
Pollutant: | Zinc
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
Weight of Evidence: | "This pollutant is being considered for listing under sections 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Data is available from 2 lines of evidence for this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification for placing this water segment-pollution combination on the section 303(d) list. The recommendation is based on staff findings that 0 of 2 available concentrations exceeded the California Toxics Rule for Cold Freshwater Habitat and this does not exceed the allowable frequency using Table 3.1 of the Listing Policy. The recommendation is also based on staff findings that 0 of 2 available concentrations exceeded the Department of Public Health Secondary MCL for Municipal & Domestic Supply and this does not exceed the allowable frequency using Table 3.1 of the Listing Policy. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met."
RWQCB Board Decision / Staff Recommendation: | After review of 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.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 10192

LOE ID: | 21363
Pollutant: | Zinc
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Municipal & Domestic Supply
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Zero of the 2 samples collected by the Surface Water Ambient Monitoring Program exceeded the Secondary MCL of 5,000 ug/L for total zinc
Data Reference: | San Joaquin River SWAMP Monitoring Data - Northeast Basin
Water Quality Objective/Criterion: | Total zinc levels should not exceed 5,000 ug/L (Department of Health Services Secondary MCL)
Objective/Criterion Reference: | California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring. http://www.cdph.ca.gov/certlic/drinkingwater/Pages/Lawbook.aspx
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected from the North Fork Mokelumne River at Hwy 26 and at Hwy 27
Temporal Representation: | The samples were collected on June 13, 2002 and on June 26 2002
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
LOE ID: | 6290
Pollutant: | Zinc
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 2
Number of Exceedances: | 0
Data and Information Type: | Not Specified
Data Used to Assess Water Quality: | Zero of the 2 samples collected by the Surface Water Ambient Monitoring Program exceeded the calculated CTR CMC for dissolved zinc
Data Reference: | San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows
Water Quality Objective/Criterion: | Dissolved zinc levels should not exceed the calculated CTR limit based on the formula: Criteria Maximum Concentration=EXP((0.8473*LN(hardness))+0.884)*(0.978)
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: | Samples were collected from the North Fork Mokelumne River at Hwy 26 and at Hwy 27
Temporal Representation: | The samples were collected on June 13, 2002 and June 26 2002
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):

DECISION ID | 5184
Pollutant: | pH
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2006)
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Weight of Evidence: | This pollutant is being considered for placement on the 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. One lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the water quality 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 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 25 samples exceeded the pH objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
RWQCB Board Decision / Staff Recommendation: | After review of 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.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 5184

LOE ID: | 2697
Pollutant: | pH
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 22
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Zero out of 22 samples at this location had a pH below 6.5. Year 2003 and Historical Water Quality Results for In Situ Measurements PG& E Companys Mokelumne River Project (FERC 137) [Table A1]. (PG&E, 2003b).
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | "pH is not to be depressed below 6.5"- From the Central Valley Regional Water Quality Control Board's Water Quality Control Plan (Basin Plan).
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Location: NFMR above Tiger Creek Afterbay at Licensee gage M-38. Rationale: Defines water quality in the NFMR at the end of the reach between Salt Springs Reservoir Dam and Tiger Creek Afterbay.
Temporal Representation: |
Environmental Conditions: |
QAPP Information: | Well documented QA/QC including 174 page report on Certified Analytical Reports and Chain-of-Custody Documentation.
QAPP Information Reference(s):
LOE ID: | 2699
Pollutant: | pH
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 24
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Zero out of 24 samples at this location had a pH below 6.5. Year 2003 and Historical Water Quality Results for In Situ Measurements PG& E Company Mokelumne River Project (FERC 137) [Table A1]. (PG&E, 2003b).
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | "pH is not to be depressed below 6.5"- From the Central Valley Regional Water Quality Control Board's Water Quality Control Plan (Basin Plan).
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Location: Mokelumne River above Electra Powerhouse. Rationale: Defines water quality in the Mokelumne River at the end of the reach between Electra Diversion Dam and Electra Powerhouse.
Temporal Representation: | Samples taken between 7/26/200 and 9/11/2003.
Environmental Conditions: |
QAPP Information: | Well documented QA/QC including 174 page report on Certified Analytical Reports and Chain-of-Custody Documentation.
QAPP Information Reference(s):
LOE ID: | 6274
Pollutant: | pH
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 25
Number of Exceedances: | 0
Data and Information Type: | Not Specified
Data Used to Assess Water Quality: | 0 of the 25 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for pH.
Data Reference: | San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows
Water Quality Objective/Criterion: | pH levels should not be lower than 6.5 or higher than 8.5 (Basin Plan Objective)
Objective/Criterion Reference: | Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected at N.Fork Mokelumne River @ Hwy 26.
Temporal Representation: | The samples were collected from Jan 9 2002 to Dec 23 2002
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
LOE ID: | 2698
Pollutant: | pH
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 21
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Zero out of 21 samples at this location had a pH below 6.5. Year 2003 and Historical Water Quality Results for In Situ Measurements PG& E Company Mokelumne River Project (FERC 137)[Table A1]. (PG&E, 2003b).
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | "pH is not to be depressed below 6.5"- From the Central Valley Regional Water Quality Control Board's Water Quality Control Plan (Basin Plan).
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Location: NFMR below Electra Diversion Dam. Rationale: Defines water quality in the NFMR at the head of the reach between Electra Diversion Dam and Electra Powerhouse, and is representative of water quality in the reach between Tiger Creek Afterbay Dam and Electra Diversion Dam.
Temporal Representation: |
Environmental Conditions: |
QAPP Information: | Well documented QA/QC including 174 page report on Certified Analytical Reports and Chain-of-Custody Documentation.
QAPP Information Reference(s):
LOE ID: | 2696
Pollutant: | pH
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 21
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Zero out of 21 samples had a pH below 6.5. Year 2003 and Historical Water Quality Results for In Situ Measurements PG& E Company Mokelumne River Project (FERC 137) [Table A1]. (PG&E, 2003b).
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | "pH is not to be depressed below 6.5"- From the Central Valley Regional Water Quality Control Board's Water Quality Control Plan (Basin Plan).
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Location: NFMR below Salt Springs Reservoir Dam. Rationale: Defines water quality in the NFMR at the head of the reach between Salt Springs Reservoir Dam and Tiger Creek Afterbay.
Temporal Representation: | Samples taken between 7/26/2000 and 9/10/2003 (none more than 2 months apart).
Environmental Conditions: |
QAPP Information: | Well documented QA/QC including 174 page report on Certified Analytical Reports and Chain-of-Custody Documentation.
QAPP Information Reference(s):

DECISION ID | 5209
Pollutant: | Temperature, water
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)(2006)
Revision Status | Original
Impairment from Pollutant or Pollution: | Pollutant
Weight of Evidence: | This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Three of the 12 values exceeded the water quality criterion. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Three of 12 annual maximum values were in exceedance of the 21.0°C steelhead annual maximum criterion and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
RWQCB Board Decision / Staff Recommendation: | No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
SWRCB Board Decision / Staff Recommendation: | This is a decision made by the State Water Resources Control Board and approved by the USEPA in 2006 . No new data were assessed by the Regional Board for 2008. The decision has not changed.
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 5209

LOE ID: | 2713
Pollutant: | Temperature, water
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 12
Number of Exceedances: | 3
Data and Information Type: | Not Specified
Data Used to Assess Water Quality: | Temperature measurements were taken at 3 monitoring stations (NFMR2, NFMR3, and NFMR5) along the North Fork of the Mokelumne River. For each station there were a total of 4 annual maximum temperature values. There was a value for each sampling year, 2000 to 2003. Based on this data, cumulatively for all 3 stations, there were a total of 12 annual maximum measurements of which 3 were in exceedance of the 21.0 degrees C steelhead criteria (PG&E, 2003b).
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. - Central Valley Regional Water Quality Control Boards Water Quality Control Plan (Basin Plan).
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: | The guideline used was from Sullivan et al. (2000) Published Temperature Thresholds-Peer Reviewed Literature which includes reviewed sub-lethal and acute temperature thresholds from a wide range of studies, incorporating information from laboratory-based research, field observations, and risk assessment approaches. This report calculated the Annual Maximum (instantaneous maximum observed during the summer) upper threshold criterion for steelhead trout as 21.0 degrees C. The risk assessment approach used by Sullivan et al. (2000) suggests that an upper threshold for the Annual Maximum of 21.0 degrees C for steelhead will reduce average growth 10% from optimum.
Guideline Reference: | Placeholder reference 2006 303(d)
Spatial Representation: | The three sampling stations (NFMR2, NFMR3, and NFMR5) were located on the North Fork of the Mokelumne River. Specific locations were below Salt Springs Reservoir Dam, above Tiger Creek Afterbay at Licensee gage M-38, and below Electra Diversion Dam.
Temporal Representation: | Temperature measurements were taken during years 2000 to 2003.
Environmental Conditions: |
QAPP Information: | QA/QC including 174 page report on Certified Analytical Reports and Chain-of-Custody Documentation.
QAPP Information Reference(s):

DECISION ID | 5144
Pollutant: | Total Nitrogen as N
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2006)
Revision Status | Original
Impairment from Pollutant or Pollution: | Pollutant
Weight of Evidence: | This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant. None of the measurements exceed the MCL. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The MCL standard for Total Nitrate as N used complies with the requirements of section 6.1.3 of the Policy. 2. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 3. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 4. None of the 59 samples exceeded the MCL, and these do not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 5. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
RWQCB Board Decision / Staff Recommendation: | No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
SWRCB Board Decision / Staff Recommendation: | This is a decision made by the State Water Resources Control Board and approved by the USEPA in 2006 . No new data were assessed by the Regional Board for 2008. The decision has not changed.
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 5144

LOE ID: | 2712
Pollutant: | Total Nitrogen as N
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Municipal & Domestic Supply
Number of Samples: | 15
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Zero out of 15 samples at this location exceed the standard for Total Nitrate as N. Historical Water Quality Results for Analytical Laboratory Measurements PG& E Company Mokelumne River Project (FERC 137) [Table A2]. (PG&E, 2003b).
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | Ten mg/L (MCLs/Title 22 Table 6444-A Primary).
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Location: NFMR above Tiger Creek Afterbay at Licensee gage M-38 (NMFR3*). Rationale: Defines water quality in the NFMR at the end of the reach between Salt Springs Reservoir Dam and Tiger Creek Afterbay.
Temporal Representation: | Samples collected between 3/14/2001 and 5/14/2001.
Environmental Conditions: |
QAPP Information: | Well documented QA/QC including 174 page report on Certified Analytical Reports and Chain-of-Custody Documentation.
QAPP Information Reference(s):
LOE ID: | 2711
Pollutant: | Total Nitrogen as N
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Municipal & Domestic Supply
Number of Samples: | 14
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Zero out of 14 samples at this location exceed the standard for Total Nitrate as N. Historical Water Quality Results for Analytical Laboratory Measurements PG& E Company Mokelumne River Project (FERC 137) [Table A2]. (PG&E, 2003b).
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | Ten mg/L (MCLs/Title 22 Table 6444-A Primary).
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Location: NFMR below Salt Springs Reservoir Dam (NFMR2*). Rationale: Defines water quality in the NFMR at the head of the reach between Salt Springs Reservoir Dam and Tiger Creek Afterbay
Temporal Representation: | Samples taken between 3/14/2001 and 5/14/2002 (none more than 2 months apart).
Environmental Conditions: |
QAPP Information: | Well documented QA/QC including 174 page report on Certified Analytical Reports and Chain-of-Custody Documentation.
QAPP Information Reference(s):
LOE ID: | 2709
Pollutant: | Total Nitrogen as N
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Municipal & Domestic Supply
Number of Samples: | 15
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Zero out of 15 samples at this location exceed the standard for Total Nitrate as N. Historical Water Quality Results for Analytical Laboratory Measurements PG& E Company Mokelumne River Project (FERC 137) [Table A2]. (PG&E, 2003b).
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | Ten mg/L (MCLs/Title 22 Table 6444-A Primary).
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Location: NFMR below Electra Diversion Dam (NFMR5*). Rationale: Defines water quality in the NFMR at the head of the reach between Electra Diversion Dam and Electra Powerhouse, and is representative of water quality in the reach between Tiger Creek Afterbay Dam and Electra Diversion Dam.
Temporal Representation: | Samples taken between 3/14/2001 and 5/14/2002.
Environmental Conditions: |
QAPP Information: | Well documented QA/QC including 174 page report on Certified Analytical Reports and Chain-of-Custody Documentation.
QAPP Information Reference(s):
LOE ID: | 2710
Pollutant: | Total Nitrogen as N
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Municipal & Domestic Supply
Number of Samples: | 15
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Zero out of 15 samples at this location exceed the standard for Total Nitrate as N. Historical Water Quality Results for Analytical Laboratory Measurements PG& E Company Mokelumne River Project (FERC 137) [Table A2]. (PG&E, 2003b).
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | Ten mg/L (MCLs/Title 22 Table 6444-A Primary).
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Location: Mokelumne River above Electra Powerhouse (MR1*). Rationale: Defines water quality in the Mokelumne River at the end of the reach between Electra Diversion Dam and Electra Powerhouse.
Temporal Representation: | Sample taken between 3/14/2001 and 5/14/2002.
Environmental Conditions: |
QAPP Information: | Well documented QA/QC including 174 page report on Certified Analytical Reports and Chain-of-Custody Documentation.
QAPP Information Reference(s):