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

Supporting Information

Regional Board 5 - Central Valley Region

Water Body Name: Delta Waterways (Stockton Ship Channel)
Water Body ID: CAE5440000020021115141407
Water Body Type: Estuary
 
DECISION ID
126854
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: DDT (Dichlorodiphenyltrichloroethane)
Final Listing Decision: Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not Delist from 303(d) list (TMDL required list)(2018)
Revision Status Revised
Sources: A Source Unknown
Expected TMDL Completion Date: 2027
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for removal from the CWA section 303(d) List under section 4.1 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status.

Four lines of evidence are available in the administrative record to assess pollutant. One line of evidence is available to assess for Municipal and Domestic Supply. One line of evidence is available to assess for Cold Freshwater Habitat. Two lines of evidence are available to assess for Commercial or recreational collection of fish, shellfish, or organisms. Zero out of one fish tissue sample exceeds the Total DDT guideline for Cold Freshwater Habitat. Zero of zero water samples exceed the DDT water quality objective for Municipal and Domestic Supply. Zero out of one fish tissue sample exceeds the Total DDT guideline for Commercial or recreational collection of fish, shellfish, or organisms. Composite fish tissue samples prior to the 2002 303(d) list indicate impairment.

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

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. Composite fish tissue samples prior to the 2002 303(d) list indicate impairment. This exceeds the allowable frequency listed in Table 4.1 of the Listing Policy.
4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 126854, DDT (Dichlorodiphenyltrichloroethane)
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 4203
 
Pollutant: DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Not Recorded
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference: Placeholder reference pre-2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Unspecified
Objective/Criterion Reference: Placeholder reference pre-2006 303(d)
 
Evaluation Guideline: Unspecified
Guideline Reference: Placeholder reference pre-2006 303(d)
 
Spatial Representation: Unspecified
Temporal Representation: Unspecified
Environmental Conditions: Unspecified
QAPP Information: Unspecified
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 126854, DDT (Dichlorodiphenyltrichloroethane)
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 195668
 
Pollutant: Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Delta Waterways (Stockton Ship Channel) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality threshold for Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD). Data were collected for 1 fish species (1 composite(s) of White Catfish each composed of 5 fish per composite).
Data Reference: Habitat, Tissue data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Discharges shall not result in pesticide concentrations in bottom sediments or aquaticlife that adversely affect beneficial uses. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: National Academy of Science guidelines (NAS 1972) establish a maximum total DDT concentration of 1000 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference: National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 544LSAC12.
Temporal Representation: Data for this line of evidence were collected between 2011-04-20 and 2011-04-20. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes.
Environmental Conditions:
QAPP Information: SWAMP QAPrP 2008
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 126854, DDT (Dichlorodiphenyltrichloroethane)
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 195424
 
Pollutant: Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Delta Waterways (Stockton Ship Channel) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality threshold for Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD). Data were collected for 1 fish species (1 composite(s) of White Catfish each composed of 5 fish per composite).
Data Reference: Habitat, Tissue data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Discharges shall not result in pesticide concentrations in bottom sediments or aquaticlife that adversely affect beneficial uses. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: The modified OEHHA Fish Contaminant Goal for total DDT in fish tissue is 15 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008)
Guideline Reference: Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 544LSAC12.
Temporal Representation: Data for this line of evidence were collected between 2011-04-20 and 2011-04-20. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes.
Environmental Conditions:
QAPP Information: SWAMP QAPrP 2008
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 126854, DDT (Dichlorodiphenyltrichloroethane)
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62648
 
Pollutant: DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: The method detection limit for all of the non-detect samples was greater than the criteria: thus the data was not used in this assessment.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The 4,4' DDT criterion for the protection of human health from the consumption of water and organisms is 0.00022 ug/L (USEPA Nationally Recommended Criteria, 2006).
Objective/Criterion Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at 6 monitoring stations: RW3- Lat.37.950283 Lon. -121.335875, RW4- Lat. 37.957000 Lon. -121.354328, RW5- Lat.37.968894 Lon. -121.371678, RW6- Lat. 37.986797 Lon. -121.393797, RW7- Lat. 37.997356 Lon. -121.444414, and RW8- Lat. 38.022203 Lon. -121.465503.
Temporal Representation: Grab samples were collected on a quarterly basis from June 2004-December 2009.
Environmental Conditions:
QAPP Information: The laboratory is an operating section of OMI/Thames Water Stockton, Inc (OMI/TW). OMI/TW operates the Wastewater Division of the City of Stockton, Municipal Utilities Department. They submitted a Quality Assurance Manual, dated 03/02/2007.
QAPP Information Reference(s):
 
 
DECISION ID
115629
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: PCBs (Polychlorinated biphenyls)
Final Listing Decision: Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (TMDL required list)(2018)
Revision Status Revised
Sources: A Source Unknown
Expected TMDL Completion Date: 2019
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for removal from the CWA section 303(d) List under section 4.1 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status.

Three lines of evidence are available in the administrative record to assess pollutant. Zero of one tissue sample exceed the evaluation guideline for COMM. Zero of 1 tissue sample exceed evaluation guideline for COLD.

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

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. Zero of one tissue sample exceed the evaluation guideline for COMM. Zero of 1 tissue sample exceed evaluation guideline for COLD. This exceeds the allowable frequency listed in Table 4.1 of the Listing Policy.
4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 115629, PCBs (Polychlorinated biphenyls)
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 195613
 
Pollutant: PCBs (Polychlorinated biphenyls)
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Delta Waterways (Stockton Ship Channel) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality threshold for PCBs (Polychlorinated biphenyls). Data were collected for 1 fish species (1 composite(s) of White Catfish each composed of 5 fish per composite).
Data Reference: Habitat, Tissue data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: National Academy of Science guidelines (NAS 1972) establish a maximum total PCB Arochlor concentration of 500 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference: National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 544LSAC12.
Temporal Representation: Data for this line of evidence were collected between 2011-04-20 and 2011-04-20. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes.
Environmental Conditions:
QAPP Information: SWAMP QAPrP 2008
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 115629, PCBs (Polychlorinated biphenyls)
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 195656
 
Pollutant: PCBs (Polychlorinated biphenyls)
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 1
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Delta Waterways (Stockton Ship Channel) to determine beneficial use support and the results are as follows 1 of the 1 samples exceeded the water quality threshold for PCBs (Polychlorinated biphenyls). Data were collected for 1 fish species (1 composite(s) of White Catfish each composed of 5 fish per composite). Of these, 1 species (White Catfish) exceeded the water quality threshold.
Data Reference: Habitat, Tissue data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: The modified OEHHA Fish Contaminant Goal for polychlorinated biphenyls in fish tissue is 2.6 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008)
Guideline Reference: Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 544LSAC12.
Temporal Representation: Data for this line of evidence were collected between 2011-04-20 and 2011-04-20. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes.
Environmental Conditions:
QAPP Information: SWAMP QAPrP 2008
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 115629, PCBs (Polychlorinated biphenyls)
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 4209
 
Pollutant: PCBs (Polychlorinated biphenyls)
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Not Recorded
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference: Placeholder reference pre-2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Unspecified
Objective/Criterion Reference: Placeholder reference pre-2006 303(d)
 
Evaluation Guideline: Unspecified
Guideline Reference: Placeholder reference pre-2006 303(d)
 
Spatial Representation: Unspecified
Temporal Representation: Unspecified
Environmental Conditions: Unspecified
QAPP Information: Unspecified
QAPP Information Reference(s):
 
 
DECISION ID
121642
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Temperature, water
Final Listing Decision: Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (TMDL required list)(2018)
Revision Status Revised
Sources: A Source Unknown
Expected TMDL Completion Date: 2027
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for removal from the CWA section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status.

Three lines of evidence are available in the administrative record to assess this pollutant.

Continuous temperature data were used as the primary source of evidence for this assessment. A rolling 7-Day Average of Daily Maximum (7DADM) was calculated for all available data and a 7DADM is evaluated as a single sample. In the absence of natural or historical temperature data, the samples were compared against USEPA Region 10 recommended temperature requirements for each appropriate salmonid life stage present in the waterbody segment (Listing Policy Section 6.1.5.9).

A total of 1,464 of 3,868 samples exceed the evaluation guideline (USEPA 2003) applied to protect the migration (MIGR) freshwater habitat beneficial use. The evaluation guideline was applied during the smolt migration (20 degrees Celsius between March 15 – June 15) and adult migration (20 degrees Celsius between September 1 – December 31) salmonid life stages.

Grab sample temperature data were available for this waterbody but were not used for this assessment because they did not satisfy the spatial and temporal representation requirements of the Listing Policy (Sections 6.1.5.2 and 6.1.5.3). The data were insufficient to determine if temperature conditions experienced by aquatic life were within the optimal temperature range throughout the entire water column or the length of time temperature conditions may have exceeded the optimal temperature range.


This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. 1,464 of 3,868 samples exceed the MIGR evaluation guideline for the 7DADM and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy.
4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.
 
 
Line of Evidence (LOE) for Decision ID 121642, Temperature, water
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62704
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Fish Migration
 
Number of Samples: 16
Number of Exceedances: 16
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Continuous monitoring data was collected at 4 different stations from 2007-2010. The MWMT values exceeded the evaluation guideline at all 4 stations on all 4 years.
Data Reference: Conventional Data for Stockton Deep Water Ship Channel, 2007-2010.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. In determining compliance with the water quality objectives for temperature, appropriate averaging periods may be applied provided that beneficial uses will be fully protected (Central Valley Regional Board Basin Plan, Pg. III-8.00, Water Quality Objectives).
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: In the absence of necessary data to interpret numeric water quality objectives, recent temperature monitoring data shall be compared to the temperature requirements of aquatic life in the water segment. In many cases, fisheries, particularly salmonids, represent the beneficial uses most sensitive to temperature. Information on current and historic conditions and distribution of sensitive beneficial uses (e.g., fishery resources) in the water segment is necessary, as well as recent temperature data reflective of conditions experienced by the most sensitive life stage of the aquatic life species. If temperature data from past (historic) periods corresponding to times when the beneficial use was fully supported are not available, information about presence/absence or abundance of sensitive aquatic life species shall be used to infer past (historic) temperature conditions if loss of habitat, diversions, toxic spills, and other factors are also considered. (SWRCB, 2004) Steelhead adults are migrating through the Bay Delta and into the San Joaquin River July through March, and juveniles migrate downstream and rear in the Delta November through July (NMFS 2009). The guideline used was the 2003 US EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards (USEPA, 2003). The document includes recommended temperature criteria for salmon and trout based on different life stages. The recommended temperature for salmon and trout adult migration is <20 degrees C for a 7DADM.
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: Data were collected at the following station in the water body: NA 40, NA42, NA43, NA48.
Temporal Representation: Samples were collected continuously between 1/1/2007 and 9/30/2010.
Environmental Conditions:
QAPP Information: Stockton Deep Water Channel Demonstration Dissolved Oxygen Aeration Facility Project Quality Assurance Project Plan.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 121642, Temperature, water
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 232815
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Fish Migration
 
Number of Samples: 3868
Number of Exceedances: 1464
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Data collected hourly from 2000 through 2019 at station RRI (San Joaquin River @ Rough & Ready Island). The data was provided by staff at the CA Department of Water Resources. Only data from the smolt migration period, March 15 through June 15, and the adult migration period, September 1 through December 31, were assessed for this metric. The 7-DADM temperatures were computed for the contiguous 7-day periods available during this time frame. The 7-day average of maximum daily temperature exceeded the evaluation guideline during 1464 of the 3868 7-day periods.
Data Reference: Quality controlled continuous temperature data from CDWR's Division of Environmental Services. Stations chosen from the California Data Exchange Network.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
 
Evaluation Guideline: A 7-day average of daily maximum (7-DADM) temperature of 20 degrees Celsius is recommended by the USEPA for waterbodies that are used almost exclusively for migration during the period of summer maximum temperatures to protect migrating juveniles and adults from lethal temperatures (USEPA, 2003). This evaluation guideline was applied to both the smolt (March 15 - June 15) and adult (September 1 - December 31) migration periods.
Guideline Reference: EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.
 
Spatial Representation: Data collected from CA Department of Water Resources Station RRI (San Joaquin River @ Rough & Ready Island).
Temporal Representation: Data collected hourly from 2000 through 2019. Data from the smolt migration period, March 15 through June 15, and the adult migration period, September 1 through December 31, were assessed for this metric.
Environmental Conditions:
QAPP Information: The data were collected by the CA Department of Water Resources' Division of Environmental Services and were deemed by the DWR to be reliable and of sound quality. Information about the monitoring equipment used is available in the reference
QAPP Information Reference(s): California Department of Water Resources (CDWR) Continuous Temperature QAPP.
 
Line of Evidence (LOE) for Decision ID 121642, Temperature, water
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62703
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Fish Migration
 
Number of Samples: 1391
Number of Exceedances: 323
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Weekly monitoring samples collected at 6 stations showed 323 out of 1391 exceedances of the evaluation guideline for temperature in this water body.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. In determining compliance with the water quality objectives for temperature, appropriate averaging periods may be applied provided that beneficial uses will be fully protected (Central Valley Regional Board Basin Plan, Pg. III-8.00, Water Quality Objectives).
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: In the absence of necessary data to interpret numeric water quality objectives, recent temperature monitoring data shall be compared to the temperature requirements of aquatic life in the water segment. In many cases, fisheries, particularly salmonids, represent the beneficial uses most sensitive to temperature. Information on current and historic conditions and distribution of sensitive beneficial uses (e.g., fishery resources) in the water segment is necessary, as well as recent temperature data reflective of conditions experienced by the most sensitive life stage of the aquatic life species. If temperature data from past (historic) periods corresponding to times when the beneficial use was fully supported are not available, information about presence/absence or abundance of sensitive aquatic life species shall be used to infer past (historic) temperature conditions if loss of habitat, diversions, toxic spills, and other factors are also considered. (SWRCB, 2004) Steelhead adults are migrating through the Bay Delta and into the San Joaquin River July through March, and juveniles migrate downstream and rear in the Delta November through July (NMFS 2009). The lethal temperature threshold for Steelhead adult migration and holding and juvenile growth and rearing is 24 degrees Celsius. (Carter, 2008).
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: Samples were collected at 6 monitoring stations: RW3- Lat.37.950283 Lon. -121.335875, RW4- Lat. 37.957000 Lon. -121.354328, RW5- Lat.37.968894 Lon. -121.371678, RW6- Lat. 37.986797 Lon. -121.393797, RW7- Lat. 37.997356 Lon. -121.444414, and RW8- Lat. 38.022203 Lon. -121.465503.
Temporal Representation: Samples were collected weekly from June 2004- December 2009.
Environmental Conditions:
QAPP Information: LABORATORY QUALITY ASSURANCE MANUAL (OMI/Thames Water Stockton, Inc).
QAPP Information Reference(s):
 
 
DECISION ID
131349
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Mercury
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)(2018)
Revision Status Revised
Sources: Agricultural Return Flows | Atmospheric Deposition | Industrial Point Sources | Municipal Point Sources | Natural Sources | Resource Extraction | See TMDL documentation | Urban Runoff/Storm Sewers
TMDL Name: Delta Methylmercury TMDL Project
TMDL Project Code: 128
Date TMDL Approved by USEPA: 10/20/2011
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for removal from the CWA section 303(d) List under sections 4.1 and 4.5 of the Listing Policy. Under this section 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.

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

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met for COMM.
 
Regional Board Decision Recommendation: This decision was made by SWRCB staff.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 131349, Mercury
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62662
 
Pollutant: Mercury
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 42
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: None of the 42 grab samples exceeded the objective.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: California Toxics Rule criteria to protect human health exposure to elemental mercury is 0.050 ug/L.
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at 6 monitoring stations: RW3- Lat.37.950283 Lon. -121.335875, RW4- Lat. 37.957000 Lon. -121.354328, RW5- Lat.37.968894 Lon. -121.371678, RW6- Lat. 37.986797 Lon. -121.393797, RW7- Lat. 37.997356 Lon. -121.444414, and RW8- Lat. 38.022203 Lon. -121.465503.
Temporal Representation: Grab samples were collected on a quarterly basis from June 2004-December 2009.
Environmental Conditions:
QAPP Information: The laboratory is an operating section of OMI/Thames Water Stockton, Inc (OMI/TW). OMI/TW operates the Wastewater Division of the City of Stockton, Municipal Utilities Department. They submitted a Quality Assurance Manual, dated 03/02/2007.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 131349, Mercury
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62663
 
Pollutant: Mercury
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 49
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: None of the 49 grab samples exceeded the evaluation guideline.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: USEPA National Recommended WQ Criteria (4-day avg) for dissolved mercury is 0.77 ug/L.
Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
 
Spatial Representation: Samples were collected at 6 monitoring stations: RW3- Lat.37.950283 Lon. -121.335875, RW4- Lat. 37.957000 Lon. -121.354328, RW5- Lat.37.968894 Lon. -121.371678, RW6- Lat. 37.986797 Lon. -121.393797, RW7- Lat. 37.997356 Lon. -121.444414, and RW8- Lat. 38.022203 Lon. -121.465503.
Temporal Representation: Grab samples were collected on a quarterly basis from June 2004-December 2009.
Environmental Conditions:
QAPP Information: The laboratory is an operating section of OMI/Thames Water Stockton, Inc (OMI/TW). OMI/TW operates the Wastewater Division of the City of Stockton, Municipal Utilities Department. They submitted a Quality Assurance Manual, dated 03/02/2007.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 131349, Mercury
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 232767
 
Pollutant: Mercury
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Delta Waterways (Stockton Ship Channel) to determine beneficial use support and the results are as follows: 0 of the 10 samples exceeded the objective for Mercury. This LOE contains data only for trophic level 4 fish and is based on samples of individual Largemouth Bass and White Catfish.
Data Reference: Habitat, Tissue data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: For the Delta Waterways, the average methylmercury concentrations shall not exceed 0.08 and 0.24 mg methylmercury/kg, wet weight, in muscle tissue of trophic level 3 and 4 fish, respectively (150-500 mm total length). (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 544LSAC12.
Temporal Representation: Data for this line of evidence were collected 2011-04-20.
Environmental Conditions:
QAPP Information: Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 131349, Mercury
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 4207
 
Pollutant: Mercury
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Not Recorded
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference: Placeholder reference pre-2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Unspecified
Objective/Criterion Reference: Placeholder reference pre-2006 303(d)
 
Evaluation Guideline: Unspecified
Guideline Reference: Placeholder reference pre-2006 303(d)
 
Spatial Representation: Unspecified
Temporal Representation: Unspecified
Environmental Conditions: Unspecified
QAPP Information: Unspecified
QAPP Information Reference(s):
 
 
DECISION ID
115631
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Aldrin
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
 
 
Line of Evidence (LOE) for Decision ID 115631, Aldrin
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 194983
 
Pollutant: Aldrin
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Delta Waterways (Stockton Ship Channel) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality threshold for Aldrin. Data were collected for 1 fish species (1 composite(s) of White Catfish each composed of 5 fish per composite).
Data Reference: Habitat, Tissue data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Discharges shall not result in pesticide concentrations in bottom sediments or aquaticlife that adversely affect beneficial uses. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: National Academy of Science guidelines (NAS 1972) establish a maximum Aldrin concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference: National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 544LSAC12.
Temporal Representation: Data for this line of evidence were collected between 2011-04-20 and 2011-04-20. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes.
Environmental Conditions:
QAPP Information: SWAMP QAPrP 2008
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
 
DECISION ID
115620
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Chlordane
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
 
 
Line of Evidence (LOE) for Decision ID 115620, Chlordane
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 195603
 
Pollutant: Chlordane
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Delta Waterways (Stockton Ship Channel) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality threshold for Total Chlordanes. Data were collected for 1 fish species (1 composite(s) of White Catfish each composed of 5 fish per composite).
Data Reference: Habitat, Tissue data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Discharges shall not result in pesticide concentrations in bottom sediments or aquaticlife that adversely affect beneficial uses. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: The modified OEHHA Fish Contaminant Goal for total chlordane in fish tissue is 3.9 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008)
Guideline Reference: Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 544LSAC12.
Temporal Representation: Data for this line of evidence were collected between 2011-04-20 and 2011-04-20. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes.
Environmental Conditions:
QAPP Information: SWAMP QAPrP 2008
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 115620, Chlordane
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 195557
 
Pollutant: Chlordane
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Delta Waterways (Stockton Ship Channel) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality threshold for Total Chlordanes. Data were collected for 1 fish species (1 composite(s) of White Catfish each composed of 5 fish per composite).
Data Reference: Habitat, Tissue data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Discharges shall not result in pesticide concentrations in bottom sediments or aquaticlife that adversely affect beneficial uses. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: National Academy of Science guidelines (NAS 1972) establish a maximum total Chlordane concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference: National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 544LSAC12.
Temporal Representation: Data for this line of evidence were collected between 2011-04-20 and 2011-04-20. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes.
Environmental Conditions:
QAPP Information: SWAMP QAPrP 2008
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
 
DECISION ID
115621
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Dieldrin
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Impairment from Pollutant or Pollution: Pollution
 
Regional Board Conclusion: Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation:
 
 
Line of Evidence (LOE) for Decision ID 115621, Dieldrin
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 194956
 
Pollutant: Dieldrin
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Delta Waterways (Stockton Ship Channel) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality threshold for Dieldrin. Data were collected for 1 fish species (1 composite(s) of White Catfish each composed of 5 fish per composite).
Data Reference: Habitat, Tissue data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Discharges shall not result in pesticide concentrations in bottom sediments or aquaticlife that adversely affect beneficial uses. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: National Academy of Science guidelines (NAS 1972) establish a maximum Dieldrin concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference: National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 544LSAC12.
Temporal Representation: Data for this line of evidence were collected between 2011-04-20 and 2011-04-20. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes.
Environmental Conditions:
QAPP Information: SWAMP QAPrP 2008
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 115621, Dieldrin
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 194958
 
Pollutant: Dieldrin
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 1
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Delta Waterways (Stockton Ship Channel) to determine beneficial use support and the results are as follows 1 of the 1 samples exceeded the water quality threshold for Dieldrin. Data were collected for 1 fish species (1 composite(s) of White Catfish each composed of 5 fish per composite). Of these, 1 species (White Catfish) exceeded the water quality threshold.
Data Reference: Habitat, Tissue data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Discharges shall not result in pesticide concentrations in bottom sediments or aquaticlife that adversely affect beneficial uses. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: The modified OEHHA Fish Contaminant Goal for dieldrin in fish tissue is 0.32 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008)
Guideline Reference: Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 544LSAC12.
Temporal Representation: Data for this line of evidence were collected between 2011-04-20 and 2011-04-20. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes.
Environmental Conditions:
QAPP Information: SWAMP QAPrP 2008
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
 
DECISION ID
115622
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Endosulfan
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
 
 
Line of Evidence (LOE) for Decision ID 115622, Endosulfan
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 195081
 
Pollutant: Endosulfan
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Delta Waterways (Stockton Ship Channel) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality threshold for Endosulfan. Data were collected for 1 fish species (1 composite(s) of White Catfish each composed of 5 fish per composite).
Data Reference: Habitat, Tissue data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Discharges shall not result in pesticide concentrations in bottom sediments or aquaticlife that adversely affect beneficial uses. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: National Academy of Science guidelines (NAS 1972) establish a maximum Endosulfan, Total concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference: National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 544LSAC12.
Temporal Representation: Data for this line of evidence were collected between 2011-04-20 and 2011-04-20. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes.
Environmental Conditions:
QAPP Information: SWAMP QAPrP 2008
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 115622, Endosulfan
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 195083
 
Pollutant: Endosulfan
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Delta Waterways (Stockton Ship Channel) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality threshold for Endosulfan. Data were collected for 1 fish species (1 composite(s) of White Catfish each composed of 5 fish per composite).
Data Reference: Habitat, Tissue data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Discharges shall not result in pesticide concentrations in bottom sediments or aquaticlife that adversely affect beneficial uses. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: The modified OEHHA Fish Contaminant Goal for endosulfan (l and ll) in fish tissue is 13,000 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008; USEPA, 2000)
Guideline Reference: Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Guideline Reference: Guidance for Assessing Chemical Contaminant Data for Use In Fish Advisories Volume 1: Fish Sampling and Analysis
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 544LSAC12.
Temporal Representation: Data for this line of evidence were collected between 2011-04-20 and 2011-04-20. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes.
Environmental Conditions:
QAPP Information: SWAMP QAPrP 2008
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
 
DECISION ID
115623
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Endrin
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
 
 
Line of Evidence (LOE) for Decision ID 115623, Endrin
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 195142
 
Pollutant: Endrin
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Delta Waterways (Stockton Ship Channel) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality threshold for Endrin. Data were collected for 1 fish species (1 composite(s) of White Catfish each composed of 5 fish per composite).
Data Reference: Habitat, Tissue data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Discharges shall not result in pesticide concentrations in bottom sediments or aquaticlife that adversely affect beneficial uses. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: The modified OEHHA Fish Contaminant Goal for endrin in fish tissue is 660 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008; USEPA, 2000)
Guideline Reference: Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Guideline Reference: Guidance for Assessing Chemical Contaminant Data for Use In Fish Advisories Volume 1: Fish Sampling and Analysis
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 544LSAC12.
Temporal Representation: Data for this line of evidence were collected between 2011-04-20 and 2011-04-20. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes.
Environmental Conditions:
QAPP Information: SWAMP QAPrP 2008
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 115623, Endrin
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 195143
 
Pollutant: Endrin
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Delta Waterways (Stockton Ship Channel) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality threshold for Endrin. Data were collected for 1 fish species (1 composite(s) of White Catfish each composed of 5 fish per composite).
Data Reference: Habitat, Tissue data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Discharges shall not result in pesticide concentrations in bottom sediments or aquaticlife that adversely affect beneficial uses. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: National Academy of Science guidelines (NAS 1972) establish a maximum Endrin concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference: National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 544LSAC12.
Temporal Representation: Data for this line of evidence were collected between 2011-04-20 and 2011-04-20. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes.
Environmental Conditions:
QAPP Information: SWAMP QAPrP 2008
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
 
DECISION ID
115624
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Heptachlor
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
 
 
Line of Evidence (LOE) for Decision ID 115624, Heptachlor
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 195367
 
Pollutant: Heptachlor
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Delta Waterways (Stockton Ship Channel) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality threshold for Heptachlor. Data were collected for 1 fish species (1 composite(s) of White Catfish each composed of 5 fish per composite).
Data Reference: Habitat, Tissue data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Discharges shall not result in pesticide concentrations in bottom sediments or aquaticlife that adversely affect beneficial uses. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: National Academy of Science guidelines (NAS 1972) establish a maximum Heptachlor concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference: National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 544LSAC12.
Temporal Representation: Data for this line of evidence were collected between 2011-04-20 and 2011-04-20. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes.
Environmental Conditions:
QAPP Information: SWAMP QAPrP 2008
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
 
DECISION ID
115625
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Heptachlor epoxide
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
 
 
Line of Evidence (LOE) for Decision ID 115625, Heptachlor epoxide
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 195401
 
Pollutant: Heptachlor epoxide
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Waterboard staff assessed SWAMP Sportfish Rivers and Streams data for Delta Waterways (Stockton Ship Channel) to determine beneficial use support and the results are as follows: Zero of Zero samples exceeded the water quality threshold for Heptachlor Epoxide. Although data was collected for 1 fish species (1 composite(s) of White Catfish each composed of 5 fish per composite), all 1 sample(s) had to be thrown out due to quantitation issues.
Data Reference: Habitat, Tissue data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Discharges shall not result in pesticide concentrations in bottom sediments or aquaticlife that adversely affect beneficial uses. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: The modified OEHHA Fish Contaminant Goal for heptachlor epoxide in fish tissue is 0.93 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008; OEHHA, 1999)
Guideline Reference: Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Guideline Reference: Public Health Goal for Heptachlor and Heptachlor Epoxide in Drinking Water
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 544LSAC12.
Temporal Representation: Data for this line of evidence were collected between 2011-04-20 and 2011-04-20. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes.
Environmental Conditions:
QAPP Information: SWAMP QAPrP 2008
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 115625, Heptachlor epoxide
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 195321
 
Pollutant: Heptachlor epoxide
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Delta Waterways (Stockton Ship Channel) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality threshold for Heptachlor Epoxide. Data were collected for 1 fish species (1 composite(s) of White Catfish each composed of 5 fish per composite).
Data Reference: Habitat, Tissue data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Discharges shall not result in pesticide concentrations in bottom sediments or aquaticlife that adversely affect beneficial uses. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: National Academy of Science guidelines (NAS 1972) establish a maximum Heptachlor Epoxide concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference: National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 544LSAC12.
Temporal Representation: Data for this line of evidence were collected between 2011-04-20 and 2011-04-20. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes.
Environmental Conditions:
QAPP Information: SWAMP QAPrP 2008
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
 
DECISION ID
115626
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Hexachlorobenzene/ HCB
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
 
 
Line of Evidence (LOE) for Decision ID 115626, Hexachlorobenzene/ HCB
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 195247
 
Pollutant: Hexachlorobenzene/ HCB
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Delta Waterways (Stockton Ship Channel) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality threshold for Hexachlorobenzene. Data were collected for 1 fish species (1 composite(s) of White Catfish each composed of 5 fish per composite).
Data Reference: Habitat, Tissue data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Discharges shall not result in pesticide concentrations in bottom sediments or aquaticlife that adversely affect beneficial uses. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: The modified OEHHA Fish Contaminant Goal for hexachlorobenzene in fish tissue is 2.8 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008; OEHHA, 2005)
Guideline Reference: Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Guideline Reference: Air Toxics Hotspots Program Risk Assessment Guidelines. Part ll Technical Support Document for Describing Available Cancer Potency Values.
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 544LSAC12.
Temporal Representation: Data for this line of evidence were collected between 2011-04-20 and 2011-04-20. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes.
Environmental Conditions:
QAPP Information: SWAMP QAPrP 2008
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
 
DECISION ID
115627
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy.

Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy).

The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy.

Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation:
 
 
Line of Evidence (LOE) for Decision ID 115627, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62661
 
Pollutant: Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 42
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: None of the 42 grab samples exceeded the objective.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The California Toxic Rule for sources of drinking water is 0.019 ug/L.
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at 6 monitoring stations: RW3- Lat.37.950283 Lon. -121.335875, RW4- Lat. 37.957000 Lon. -121.354328, RW5- Lat.37.968894 Lon. -121.371678, RW6- Lat. 37.986797 Lon. -121.393797, RW7- Lat. 37.997356 Lon. -121.444414, and RW8- Lat. 38.022203 Lon. -121.465503.
Temporal Representation: Grab samples were collected on a quarterly basis from June 2004-December 2009.
Environmental Conditions:
QAPP Information: The laboratory is an operating section of OMI/Thames Water Stockton, Inc (OMI/TW). OMI/TW operates the Wastewater Division of the City of Stockton, Municipal Utilities Department. They submitted a Quality Assurance Manual, dated 03/02/2007.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 115627, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 195347
 
Pollutant: Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Delta Waterways (Stockton Ship Channel) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality threshold for HCH, gamma-. Data were collected for 1 fish species (1 composite(s) of White Catfish each composed of 5 fish per composite).
Data Reference: Habitat, Tissue data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Discharges shall not result in pesticide concentrations in bottom sediments or aquaticlife that adversely affect beneficial uses. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: National Academy of Science guidelines (NAS 1972) establish a maximum Lindane concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference: National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 544LSAC12.
Temporal Representation: Data for this line of evidence were collected between 2011-04-20 and 2011-04-20. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes.
Environmental Conditions:
QAPP Information: SWAMP QAPrP 2008
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 115627, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 195222
 
Pollutant: Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Delta Waterways (Stockton Ship Channel) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality threshold for HCH, gamma-. Data were collected for 1 fish species (1 composite(s) of White Catfish each composed of 5 fish per composite).
Data Reference: Habitat, Tissue data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Discharges shall not result in pesticide concentrations in bottom sediments or aquaticlife that adversely affect beneficial uses. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: The modified OEHHA Fish Contaminant Goal for lindane in fish tissue is 4.6 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008; OEHHA, 2005)
Guideline Reference: Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Guideline Reference: Air Toxics Hotspots Program Risk Assessment Guidelines. Part ll Technical Support Document for Describing Available Cancer Potency Values.
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 544LSAC12.
Temporal Representation: Data for this line of evidence were collected between 2011-04-20 and 2011-04-20. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes.
Environmental Conditions:
QAPP Information: SWAMP QAPrP 2008
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
 
DECISION ID
115628
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Mirex
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
 
 
Line of Evidence (LOE) for Decision ID 115628, Mirex
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 195487
 
Pollutant: Mirex
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Waterboard staff assessed SWAMP Sportfish Rivers and Streams data for Delta Waterways (Stockton Ship Channel) to determine beneficial use support and the results are as follows: Zero of Zero samples exceeded the water quality threshold for Mirex. Although data was collected for 1 fish species (1 composite(s) of White Catfish each composed of 5 fish per composite), all 1 sample(s) had to be thrown out due to quantitation issues.
Data Reference: Habitat, Tissue data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Discharges shall not result in pesticide concentrations in bottom sediments or aquaticlife that adversely affect beneficial uses. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: The modified OEHHA Fish Contaminant Goal for mirex in fish tissue is 0.28 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008; OEHHA, 1992)
Guideline Reference: Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Guideline Reference: Expedited Cancer Potency Values and Proposed Regulatory Levels for Certain Proposition 65 Carcinogens.
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 544LSAC12.
Temporal Representation: Data for this line of evidence were collected between 2011-04-20 and 2011-04-20. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes.
Environmental Conditions:
QAPP Information: SWAMP QAPrP 2008
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
 
DECISION ID
115630
Region 5     
Delta Waterways (Stockton Ship Channel)
 
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
 
Regional Board Conclusion: This pollutant is being considered for placement on the Clean Water Act (CWA) section 303(d) List under section 3.1 of the Listing Policy.

One line of evidence is available in the administrative record to assess this pollutant. Zero of two samples exceed the evaluation guideline for the commercial or recreational collection of fish, shellfish, or organisms 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.

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 two samples exceed the evaluation guideline for the commercial or recreational collection of fish, shellfish, or organisms beneficial use. 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 115630, Selenium
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 195506
 
Pollutant: Selenium
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 2
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Delta Waterways (Stockton Ship Channel) to determine beneficial use support and the results are as follows 0 of the 2 samples exceeded the water quality threshold for Selenium. Data were collected for 2 fish species (1 composite(s) of White Catfish each composed of 5 fish per composite, 1 composite(s) of Largemouth Bass each composed of 5 fish per composite).
Data Reference: Habitat, Tissue data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: The OEHHA Fish Contaminant Goal for selenium in fish tissue is 7.4 ppm. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day. A background dietary consumption rate of 0.114 mg/day is applied for this micronutrient. (Klasing, S., and R. Brodberg, 2008)
Guideline Reference: Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 544LSAC12.
Temporal Representation: Data for this line of evidence were collected between 2011-04-20 and 2011-04-20. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes.
Environmental Conditions:
QAPP Information: SWAMP QAPrP 2008
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
 
DECISION ID
121643
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Total Dissolved Solids
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: 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.

One line of evidence is available in the administrative record to assess this pollutant. Fourteen of the 1214 samples exceed the objective for Municipal & Domestic Supply.

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

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. Fourteen of the 12141 samples exceed the objective for Municipal & Domestic Supply. This does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 121643, Total Dissolved Solids
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 59403
 
Pollutant: Total Dissolved Solids
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 1214
Number of Exceedances: 14
 
Data and Information Type: Fixed station physical/chemical monitoring (conventional pollutants only)
Data Used to Assess Water Quality: There were 14 out of the 1,214 samples that had a TDS levels above 500 mg/L.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: For Total Dissolved Solids (TDS), the secondary MCL recommended range is 500 mg/l, the upper range is 1000 mg/l, and the short term range is 1500 mg/l. The recommended range of 500 mg/L was used for the purpose of this assessment.
Objective/Criterion Reference: Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Six stations (R3, R4, R5, R6, R7, & R8) were sampled in the San Joaquin River in the Stockton Ship Channel, a portion of the Delta between Turner Cut and Stockton.
Temporal Representation: Starting in 2004 through 2009, measurements were recorded weekly for the months of September, October, and November.
Environmental Conditions:
QAPP Information: Laboratory Quality Assurance Manual submitted with data (OMI/Thames Water Stockton Laboratory Quality Assurance Manual).
QAPP Information Reference(s): Quality Assurance Project Plan for City of Stockton - San Joaquin River, Revision 4.20.
 
 
DECISION ID
121640
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: pH
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status.

Two lines of evidence are available in the administrative record to assess this pollutant. Thirty-seven of the 6,705 samples exceed the objective for Aquatic Life.

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. Thirty-seven of the 6,705 samples exceed the objective for Aquatic Life. These do not exceed the allowable frequency listed in Table 3.2 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 121640, pH
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62691
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 1379
Number of Exceedances: 4
 
Data and Information Type: Fixed station physical/chemical monitoring (conventional pollutants only)
Data Used to Assess Water Quality: One of the 1379 samples was greater than 8.5 and three of the 1379 samples were less than 6.5, thought to be protective of freshwater habitat.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The pH shall not be depressed below 6.5 nor raised above 8.5.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Six stations (R3, R4, R5, R6, R7, & R8) were sampled in the San Joaquin River in the Stockton Ship Channel, a portion of the Delta between Turner Cut and Stockton.
Temporal Representation: Starting in June of 2004 through December of 2009, measurements were recorded weekly.
Environmental Conditions:
QAPP Information: According to the included OMI/Thames Water Stockton Laboratory Quality Assurance Manual, dissolved oxygen meters were checked by the Winkler dissolved oxygen method weekly. The method to determine data quality was not described but the QAP states "Dissolved oxygen, electrical conductivity, and pH meters are standardized before use and their performance verified after measurements are made. The values, time and operator's I.D. are recorded on worksheets associated with the tests."
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 121640, pH
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 59395
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 5309
Number of Exceedances: 33
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Continuous monitoring data was collected at 4 different stations from 2007-2010. The pH data was averaged daily and there were 33 daily averages out of 5308 that were outside the acceptable range for pH and therefore exceed the water quality objective for pH in this water body.
Data Reference: Conventional Data for Stockton Deep Water Ship Channel, 2007-2010.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data were collected at the following station in the water body: NA 40, NA42, NA43, NA48.
Temporal Representation: Samples were collected continuously between 1/1/2007 and 9/30/2010.
Environmental Conditions:
QAPP Information: Stockton Deep Water Channel Demonstration Dissolved Oxygen Aeration Facility Project Quality Assurance Project Plan.
QAPP Information Reference(s): Quality Assurance Project Plan for Stockton Deep Water Ship Channel.
 
 
DECISION ID
84542
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Indicator Bacteria
Final Listing Decision: Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Delist from 303(d) list (TMDL required list)(2016)
Revision Status Original
Reason for Delisting: Applicable WQS attained; reason for recovery unspecified
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for removal from the CWA section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status.

Two lines of evidence are available in the administrative record to assess this pollutant. Fifty five of 1,209 samples exceed the fecal coliform water quality objective.

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

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. Fifty five of 1,209 samples exceed the fecal coliform water quality objective and this does not exceed the allowable frequency listed in Table 4.2 of the Listing Policy.
4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be removed from the section 303(d) list because applicable water quality standards for the pollutant are not being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 84542, Indicator Bacteria
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62652
 
Pollutant: Fecal Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 1209
Number of Exceedances: 55
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Fifty-five of the 1209 samples exceeded the fecal coliform objective.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: In waters designated for contact recreation (REC-1), the fecal coliform concentration shall not exceed 400/100ml.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected from RSW-003 San Joaquin River at Deep Water Channel, RSW-004 San Joaquin River at Light 45, RSW-005 San Joaquin River at Light 41, RSW-006 San Joaquin River at Light 36, RSW-007 San Joaquin River at Light 24 and RSW-008 San Joaquin River at Light 18. CAE5440000020021115141407
Temporal Representation: Samples were collected monthly December through April and quarterly May through November. The data was collected from June 2004 to December 2009.
Environmental Conditions:
QAPP Information: Samples collected under NPDES Permit CA0079138. Provided lab QA manual for OMI/Thames Water Stockton Laboratory, 2007.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 84542, Indicator Bacteria
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 4208
 
Pollutant: Pathogens
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference: Placeholder reference pre-2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Unspecified
Objective/Criterion Reference: Placeholder reference pre-2006 303(d)
 
Evaluation Guideline: Unspecified
Guideline Reference: Placeholder reference pre-2006 303(d)
 
Spatial Representation: Unspecified
Temporal Representation: Unspecified
Environmental Conditions: Unspecified
QAPP Information: Unspecified
QAPP Information Reference(s):
 
 
DECISION ID
84543
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Toxicity
Final Listing Decision: Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not Delist from 303(d) list (TMDL required list)(2016)
Revision Status Original
Sources: A Source Unknown
Expected TMDL Completion Date: 2027
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for removal from the CWA section 303(d) List under section 4.1 and 4.6 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status.

Three lines of evidence are available in the administrative record to assess pollutant. Zero of 47 water samples tested for exhibited significant effect on survival of Hyalella azteca. Zero of 47 water samples exhibited significant effect on growth of Hyalella azteca.

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

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. Zero of 47 water samples tested for exhibited significant effect on survival of Hyalella azteca and this does not exceed the allowable frequency listed in Table 4.1 of the Listing Policy.
4. This waterbody was originally placed on the CWA Section 303(d) List due to toxicity to Pimephales promelas, Ceriodaphnia dubia, and Selenastrum capricornutum. There is not sufficient information available to determine if this impairment has been addressed.
4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 84543, Toxicity
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 77232
 
Pollutant: Toxicity
LOE Subgroup: Toxicity
Matrix: Water
Fraction: None
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 47
Number of Exceedances: 0
 
Data and Information Type: TOXICITY TESTING
Data Used to Assess Water Quality: Forty seven samples were tested for toxicity. Zero samples exhibited a statistically significant effect relative to the control. The toxicity tests measured 10-day survival of Hyalella azteca.
Data Reference: Pelagic Organism Decline (POD): Acute and Chronic Invertebrate and Fish Toxicity Testing in the Sacramento-San Joaquin Delta 2008-2010
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance
or the interactive effect of multiple substances.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing (parametric Dunnett's Test or non-parametric Kruskal-Wallis or Wilcoxon Two-sample Test). The t-test is used to determine if there is a statistically significant decrease in organism response in the sample as compared to the control.
Guideline Reference: Short-term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Freshwater Organisms. Fourth Edition. Office of Water, U.S. Environmental Protection Agency. Washington, D.C. EPA-821-R-02-013
 
Spatial Representation: Samples were collected from the San Joaquin River at Rough and Ready Island.
Temporal Representation: Samples were collected between January 31, 2008 and December 30, 2009.
Environmental Conditions:
QAPP Information: Procedures used in this study were based on protocols described in the Quality Assurance Management 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)
 
Line of Evidence (LOE) for Decision ID 84543, Toxicity
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 77233
 
Pollutant: Toxicity
LOE Subgroup: Toxicity
Matrix: Water
Fraction: None
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 47
Number of Exceedances: 0
 
Data and Information Type: TOXICITY TESTING
Data Used to Assess Water Quality: Forty seven samples were tested for toxicity. Zero samples exhibited a statistically significant effect relative to the control. The toxicity tests measured 10-day growth of Hyalella azteca.
Data Reference: Pelagic Organism Decline (POD): Acute and Chronic Invertebrate and Fish Toxicity Testing in the Sacramento-San Joaquin Delta 2008-2010
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance
or the interactive effect of multiple substances.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing (parametric Dunnett's Test or non-parametric Kruskal-Wallis or Wilcoxon Two-sample Test). The t-test is used to determine if there is a statistically significant decrease in organism response in the sample as compared to the control.
Guideline Reference: Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms, Fifth Edition. EPA-821-R-02-012
 
Spatial Representation: Samples were collected from the San Joaquin River at Rough and Ready Island.
Temporal Representation: Samples were collected between January 31, 2008 and December 30, 2009.
Environmental Conditions:
QAPP Information: Procedures used in this study were based on protocols described in the Quality Assurance Management 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)
 
Line of Evidence (LOE) for Decision ID 84543, Toxicity
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 4210
 
Pollutant: Unknown Toxicity
LOE Subgroup: Toxicity
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference: Placeholder reference pre-2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Unspecified
Temporal Representation: Unspecified
Environmental Conditions: Unspecified
QAPP Information: Unspecified
QAPP Information Reference(s):
 
 
DECISION ID
71705
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Organic Enrichment/Low Dissolved Oxygen
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 Original
Sources: A Source Unknown
TMDL Name: San Joaquin River Dissolved Oxygen
TMDL Project Code: 207
Date TMDL Approved by USEPA: 02/27/2007
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.

Five lines of evidence are available in the administrative record to assess this pollutant. Four hundred and sixty three of the 2,333 samples exceed the water quality objective.

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

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. Four hundred and sixty three of the 2,333 samples exceed the water quality objective and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 71705, Organic Enrichment/Low Dissolved Oxygen
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62690
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Fish Migration
 
Number of Samples: 185
Number of Exceedances: 79
 
Data and Information Type: Fixed station physical/chemical monitoring (conventional pollutants only)
Data Used to Assess Water Quality: 79 of the 185 samples were lower than the minimum allowable dissolved oxygen concentration of 6.0 mg/l thought to be protective of salmonid during their migration through the Delta. Per Listing Policy section 6.1.5.6, the minimum dissolved oxygen measurements are used to determine compliance with the water quality objective. The averaging period is not specified in the objective, therefore an averaging period of 7 days was applied.
Data Reference: Conventional Data for Stockton Deep Water Ship Channel, 2007-2010.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Within the legal boundaries of the Delta for the San Joaquin River between Turner Cut and Stockton, dissolved oxygen concentration shall not be reduced below 6.0 milligrams per liter (mg/L) for September 1 through November 30.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Five stations (NA40, NA42, NA43, NA48, and RRI) were sampled in the San Joaquin River in the Stockton Ship Channel, a portion of the Delta between Turner Cut and Stockton.
Temporal Representation: Data were recorded every 15 minutes during the years 2007, 2008, and 2009. The minimum weekly dissolved oxygen reading for each of the five stations was used in this assessment.
Environmental Conditions:
QAPP Information: Samples were collected and analyzed in accordance with the Stockton Deep Water Ship Channel Demonstration Dissolved Oxygen Aeration Facility Project Quality Assurance Project Plan for pH. The YSI-63 unit is used to take pH field readings and has an accuracy specification of +/- 0.2 units.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 71705, Organic Enrichment/Low Dissolved Oxygen
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62689
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 772
Number of Exceedances: 221
 
Data and Information Type: Fixed station physical/chemical monitoring (conventional pollutants only)
Data Used to Assess Water Quality: Two hundred and twenty nine of the 772 samples were lower than the minimum allowable dissolved oxygen concentration of 5.0 mg/l thought to be protective of freshwater habitat. Per Listing Policy section 6.1.5.6, the minimum dissolved oxygen measurements are used to determine compliance with the water quality objective. The averaging period is not specified in the objective, therefore an averaging period of 7 days was applied.
Data Reference: Conventional Data for Stockton Deep Water Ship Channel, 2007-2010.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Within the legal boundaries of the Delta for the San Joaquin River between Turner Cut and Stockton, dissolved oxygen concentration shall not be reduced below 5.0 milligrams per liter (mg/L) for December 1 through August 30.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Five stations (NA40, NA42, NA43, NA48, and RRI) were sampled in the San Joaquin River in the Stockton Ship Channel, a portion of the Delta between Turner Cut and Stockton.
Temporal Representation: Data were recorded every 15 minutes during the years 2007, 2008, 2009, and 2010. The minimum weekly dissolved oxygen reading for each of the five stations was used in this assessment.
Environmental Conditions:
QAPP Information: Samples were collected and analyzed in accordance with the Stockton Deep Water Ship Channel Demonstration Dissolved Oxygen Aeration Facility Project Quality Assurance Project Plan for pH. The YSI-63 unit is used to take pH field readings and has an accuracy specification of +/- 0.2 units.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 71705, Organic Enrichment/Low Dissolved Oxygen
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62679
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 924
Number of Exceedances: 91
 
Data and Information Type: Fixed station physical/chemical monitoring (conventional pollutants only)
Data Used to Assess Water Quality: 91 of the 924 samples were lower than the minimum allowable dissolved oxygen concentration of 5.0 mg/l thought to be protective of freshwater habitat.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Within the legal boundaries of the Delta for the San Joaquin River between Turner Cut and Stockton, dissolved oxygen concentration shall not be reduced below 5.0 milligrams per liter (mg/L) for December 1 through August 30.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Six stations (R3, R4, R5, R6, R7, & R8) were sampled in the San Joaquin River in the Stockton Ship Channel, a portion of the Delta between Turner Cut and Stockton.
Temporal Representation: Starting in 2004 through 2009, measurements were recorded weekly for the months of May through August, and monthly for the months of December through April.
Environmental Conditions:
QAPP Information: According to the included OMI/Thames Water Stockton Laboratory Quality Assurance Manual, dissolved oxygen meters were checked by the Winkler dissolved oxygen method weekly. The method to determine data quality was not described but the QAP states "Dissolved oxygen, electrical conductivity, and pH meters are standardized before use and their performance verified after measurements are made. The values, time and operator's I.D. are recorded on worksheets associated with the tests."
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 71705, Organic Enrichment/Low Dissolved Oxygen
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 579
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total Dissolved
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 71705, Organic Enrichment/Low Dissolved Oxygen
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62678
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Fish Migration
 
Number of Samples: 452
Number of Exceedances: 72
 
Data and Information Type: Fixed station physical/chemical monitoring (conventional pollutants only)
Data Used to Assess Water Quality: 72 of the 452 samples were lower than the minimum allowable dissolved oxygen concentration of 6.0 mg/l thought to be protective of salmonid during their fish migration through the Delta.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Within the legal boundaries of the Delta for the San Joaquin River between Turner Cut and Stockton, dissolved oxygen concentration shall not be reduced below 6.0 milligrams per liter (mg/L) for September 1 through November 30.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Six stations (R3, R4, R5, R6, R7, & R8) were sampled in the San Joaquin River in the Stockton Ship Channel, a portion of the Delta between Turner Cut and Stockton.
Temporal Representation: Starting in 2004 through 2009, measurements were recorded weekly for the months of September, October, and November.
Environmental Conditions:
QAPP Information: According to the included OMI/Thames Water Stockton Laboratory Quality Assurance Manual, dissolved oxygen meters were checked by the Winkler dissolved oxygen method weekly. The method to determine data quality was not described but the QAP states "Dissolved oxygen, electrical conductivity, and pH meters are standardized before use and their performance verified after measurements are made. The values, time and operator's I.D. are recorded on worksheets associated with the tests."
QAPP Information Reference(s):
 
 
DECISION ID
88854
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1of the Listing Policy. Under section 3.1a single line of evidence is necessary to assess listing status.

One lines of evidence is available in the administrative record to assess this pollutant. Zero of the 0 samples exceed the California Toxics Rule for human protection for MUN.

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

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 the 0 samples exceed the California Toxics Rule for human protection for MUN and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1.
4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 88854, 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62638
 
Pollutant: 1,1-Dichloroethylene (DCE)/ Vinylidene Chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: The Minimum Detection Level is greater than the objective, so there are actually 0 samples.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: California Inland Surface Waters Sources of Drinking Water CTR for human health protection (water and fish consumption) value is 0.057 ug/L.
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at 6 monitoring stations: RW3- Lat.37.950283 Lon. -121.335875, RW4- Lat. 37.957000 Lon. -121.354328, RW5- Lat.37.968894 Lon. -121.371678, RW6- Lat. 37.986797 Lon. -121.393797, RW7- Lat. 37.997356 Lon. -121.444414, and RW8- Lat. 38.022203 Lon. -121.465503.
Temporal Representation: Grab samples were collected on a quarterly basis from June 2004-December 2009.
Environmental Conditions:
QAPP Information: The laboratory is an operating section of OMI/Thames Water Stockton, Inc (OMI/TW). OMI/TW operates the Wastewater Division of the City of Stockton, Municipal Utilities Department. They submitted a Quality Assurance Manual, dated 03/02/2007.
QAPP Information Reference(s):
 
 
DECISION ID
88722
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Bis(2ethylhexyl)phthalate (DEHP)
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this llutant. Two of the 42 samples exceed the California Toxics Rule for MUN.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category.

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. Two of the 42 samples exceed the California Toxics Rule for MUN and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 88722, Bis(2ethylhexyl)phthalate (DEHP)
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62639
 
Pollutant: Bis(2ethylhexyl)phthalate (DEHP)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 42
Number of Exceedances: 2
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: Two of the 42 grab samples exceeded the objective.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The CTR value for protection of human health (water and organisms) is 1.8 ug/L.
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at 6 monitoring stations: RW3- Lat.37.950283 Lon. -121.335875, RW4- Lat. 37.957000 Lon. -121.354328, RW5- Lat.37.968894 Lon. -121.371678, RW6- Lat. 37.986797 Lon. -121.393797, RW7- Lat. 37.997356 Lon. -121.444414, and RW8- Lat. 38.022203 Lon. -121.465503.
Temporal Representation: Grab samples were collected on a quarterly basis from June 2004-December 2009.
Environmental Conditions:
QAPP Information: The laboratory is an operating section of OMI/Thames Water Stockton, Inc (OMI/TW). OMI/TW operates the Wastewater Division of the City of Stockton, Municipal Utilities Department. They submitted a Quality Assurance Manual, dated 03/02/2007.
QAPP Information Reference(s):
 
 
DECISION ID
99579
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Bromoform
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the 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 lines of evidence are available in the administrative record to assess this pollutant. Zero of 30 samples exceed the criteria for MUN.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category.

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. Zero of 30 samples exceed the criteria for MUN and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 99579, Bromoform
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62640
 
Pollutant: Bromoform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 30
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: None of the 30 grab samples exceeded the objective of 4.3 ug/L.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The California Toxic Rule for sources of drinking water is 4.3 ug/L.
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at 6 monitoring stations: RW3- Lat.37.950283 Lon. -121.335875, RW4- Lat. 37.957000 Lon. -121.354328, RW5- Lat.37.968894 Lon. -121.371678, RW6- Lat. 37.986797 Lon. -121.393797, RW7- Lat. 37.997356 Lon. -121.444414, and RW8- Lat. 38.022203 Lon. -121.465503.
Temporal Representation: Grab samples were collected on a quarterly basis from June 2004-December 2009.
Environmental Conditions:
QAPP Information: The laboratory is an operating section of OMI/Thames Water Stockton, Inc (OMI/TW). OMI/TW operates the Wastewater Division of the City of Stockton, Municipal Utilities Department. They submitted a Quality Assurance Manual, dated 03/02/2007.
QAPP Information Reference(s):
 
 
DECISION ID
99662
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Dichlorobromomethane
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the 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.

[NUMBER] lines of evidence are available in the administrative record to assess this pollutant. [NUMBER] of the [NUMBER] samples exceed the [OBJECTIVE/GUIDELINE/CRITERIA].

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. [NUMBER] of [NUMBER] samples exceeded the [OBJECTIVE/GUIDELINE/CRITERIA] and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 99662, Dichlorobromomethane
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62649
 
Pollutant: Dichlorobromomethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 72
Number of Exceedances: 2
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: Two of the 72 grab samples exceeded the objective of 0.56 ug/L.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The California Toxic Rule for sources of drinking water is 0.56 ug/L.
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at 6 monitoring stations: RW3- Lat.37.950283 Lon. -121.335875, RW4- Lat. 37.957000 Lon. -121.354328, RW5- Lat.37.968894 Lon. -121.371678, RW6- Lat. 37.986797 Lon. -121.393797, RW7- Lat. 37.997356 Lon. -121.444414, and RW8- Lat. 38.022203 Lon. -121.465503.
Temporal Representation: Grab samples were collected on a quarterly basis from June 2004-December 2009.
Environmental Conditions:
QAPP Information: The laboratory is an operating section of OMI/Thames Water Stockton, Inc (OMI/TW). OMI/TW operates the Wastewater Division of the City of Stockton, Municipal Utilities Department. They submitted a Quality Assurance Manual, dated 03/02/2007.
QAPP Information Reference(s):
 
 
DECISION ID
89187
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Dichloromethane
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. Zero of the 42 samples exceed the maximum contamination level for MUN.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category.

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. Zero of the 42 samples exceed the maximum contamination level for MUN and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 89187, Dichloromethane
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62650
 
Pollutant: Dichloromethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 42
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: None of the 42 grab samples exceeded the objective.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The maximum contamination level of thought to be protective of sources of drinking water is 5 ug/L.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
Objective/Criterion Reference: California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at 6 monitoring stations: RW3- Lat.37.950283 Lon. -121.335875, RW4- Lat. 37.957000 Lon. -121.354328, RW5- Lat.37.968894 Lon. -121.371678, RW6- Lat. 37.986797 Lon. -121.393797, RW7- Lat. 37.997356 Lon. -121.444414, and RW8- Lat. 38.022203 Lon. -121.465503.
Temporal Representation: Grab samples were collected on a quarterly basis from June 2004-December 2009.
Environmental Conditions:
QAPP Information: The laboratory is an operating section of OMI/Thames Water Stockton, Inc (OMI/TW). OMI/TW operates the Wastewater Division of the City of Stockton, Municipal Utilities Department. They submitted a Quality Assurance Manual, dated 03/02/2007.
QAPP Information Reference(s):
 
 
DECISION ID
99663
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Endrin aldehyde
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. Zero of the 42 samples exceed the California Toxics Rule for MUN.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category.

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. Zero of the 42 samples exceed the California Toxics Rule for MUN and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 99663, Endrin aldehyde
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62651
 
Pollutant: Endrin aldehyde
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 42
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: None of the 42 grab samples exceeded the objective.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The California Toxic Rule for sources of drinking water is 0.76 ug/L.
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at 6 monitoring stations: RW3- Lat.37.950283 Lon. -121.335875, RW4- Lat. 37.957000 Lon. -121.354328, RW5- Lat.37.968894 Lon. -121.371678, RW6- Lat. 37.986797 Lon. -121.393797, RW7- Lat. 37.997356 Lon. -121.444414, and RW8- Lat. 38.022203 Lon. -121.465503.
Temporal Representation: Grab samples were collected on a quarterly basis from June 2004-December 2009.
Environmental Conditions:
QAPP Information: The laboratory is an operating section of OMI/Thames Water Stockton, Inc (OMI/TW). OMI/TW operates the Wastewater Division of the City of Stockton, Municipal Utilities Department. They submitted a Quality Assurance Manual, dated 03/02/2007.
QAPP Information Reference(s):
 
 
DECISION ID
93967
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Nitrate
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. Zero of the 1211 samples exceed the Criteria/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. Zero of 1211 samples exceeded the Criteria/Objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 93967, Nitrate
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62664
 
Pollutant: Nitrate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 1211
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: None of 1211 samples collected at six sites exceeded the water quality objective for nitrate and nitrate. Samples were reported as nitrate as nitrogen and converted before compared with the objective.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: At a minimum, water designated for MUN shall not contain concentrations of chemical constituents in excess of the MCL specified in Title 22 of the California Code of Regulations. The MCL for nitrate (as NO3) is 45 mg/L.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at sites R3, R4, R5, R6, R7, and R8.
Temporal Representation: Samples were collected from June 2004 to December 2009.
Environmental Conditions:
QAPP Information: Samples were collected as part of a discharger self monitoring report for NPDES Permit# CA0079138, WDR Orders# R5-2002-0083 and R5-2008-0154.
QAPP Information Reference(s):
 
 
DECISION ID
94019
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Nitrate/Nitrite (Nitrite + Nitrate as N)
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. Zero of the 497 samples exceed the Criteria/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. Zero of 497 samples exceeded the Criteria/Objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 94019, Nitrate/Nitrite (Nitrite + Nitrate as N)
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62665
 
Pollutant: Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 497
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: None of 497 samples collected at the sampling location exceeded the objective for nitrate + nitrite (as N).
Data Reference: Data for Nutrients in Region 5, Jan. 1975 - Jan. 2007.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: At a minimum, water designated for MUN shall not contain concentrations of chemical constituents in excess of the MCL specified in Title 22 of the California Code of Regulations. The MCL for nitrate + nitrite (as N) is 10 mg/L.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at station P8 San Joaquin River @ Buckley Cove.
Temporal Representation: Samples were collected from 1975 to 2007.
Environmental Conditions:
QAPP Information: Samples were collected as part of a long term monitoring of water quality. No other description of the study were provided. A modified method comparable to other standard methods was used to measure results from 1996 to 2004.
QAPP Information Reference(s):
 
 
DECISION ID
94020
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Nitrogen, Nitrate
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. Zero of the 1217 samples exceed the Criteria/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. Zero of 1217 samples exceeded the Criteria/Objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 94020, Nitrogen, Nitrate
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62666
 
Pollutant: Nitrogen, Nitrate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 1199
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: None of 1199 samples collected at six sites exceeded the objective for nitrite.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: At a minimum, water designated for MUN shall not contain concentrations of chemical constituents in excess of the MCL specified in Title 22 of the California Code of Regulations. The MCL for nitrite (as N) is 1 mg/L.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at R3, R4, R5, R6, R7, and R8.
Temporal Representation: Samples were collected from June 20004 to December 2009.
Environmental Conditions:
QAPP Information: Samples were collected as part of a discharger self monitoring report for NPDES Permit# CA0079138, WDR Orders# R5-2002-0083 and R5-2008-0154.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 94020, Nitrogen, Nitrate
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62675
 
Pollutant: Nitrogen, Nitrate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 18
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: None of 18 samples collected at the sampling location exceeded the objective for nitrite.
Data Reference: Data for Nutrients in Region 5, Jan. 1975 - Jan. 2007.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: At a minimum, water designated for MUN shall not contain concentrations of chemical constituents in excess of the MCL specified in Title 22 of the California Code of Regulations. The MCL for nitrite (as N) is 1 mg/L.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at station P8 San Joaquin River @ Buckley Cove.
Temporal Representation: Samples were collected from 1975 to 1976.
Environmental Conditions:
QAPP Information: Samples were collected as part of a long term monitoring of water quality. No other description of the study were provided. None of the supporting documents describe the data collection during this time period.
QAPP Information Reference(s):
 
 
DECISION ID
94080
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Nitrogen, ammonia (Total 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 Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Two lines of evidence are available in the administrative record to assess this pollutant. Zero of the 1061 samples exceed the Evaluation Guideline.

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 1061 samples exceeded the Evaluation Guideline and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 94080, Nitrogen, ammonia (Total Ammonia)
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62676
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Fish Spawning
 
Number of Samples: 251
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: None of 251 30-day averages exceeded the evaluation guideline for total ammonia as N. Ammonia samples that did not have corresponding pH and temperature data were not used to calculate averages.
Data Reference: Data for Nutrients in Region 5, Jan. 1975 - Jan. 2007.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: The USEPA recommended freshwater aquatic life ambient water quality criteria for ammonia is based on pH, temperature, and the presence of early life stages of fish. The continuous concentration used is based on a 30-day average.
Guideline Reference: 1999 Update of Ambient Water Quality Criteria for Ammonia
 
Spatial Representation: Samples were collected at station P8 San Joaquin River @ Buckley Cove.
Temporal Representation: Samples were collected from 1975 to 2010.
Environmental Conditions:
QAPP Information: Samples were collected as part of a long term monitoring of water quality. No other descriptions of the study were provided.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 94080, Nitrogen, ammonia (Total Ammonia)
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62677
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Fish Spawning
 
Number of Samples: 810
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: None of the 810 samples exceed the water USEPA Temperature and pH-Dependent values of the CCC (Chronic Criterion) for Fish Early Life Stages Present for ammonia.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: Update of Ambient Water Quality Criteria for Ammonia (USEPA 1999): Where salmonids and fish early life stages are present, the 30-day average concentration (criterion continuous concentration or CCC) of total ammonia (as mg N/L) in freshwater are not to be exceeded more than once every three years on average. The CCC values are based on pH, temperature, and the presence of early life stages of fish. The CCC formula is found on p.83 and the table of CCC values are found on p.87.
Guideline Reference: 1999 Update of Ambient Water Quality Criteria for Ammonia
 
Spatial Representation: Samples were collected in sites R3 and R4 R5, R6, R7, and R8.
Temporal Representation: Samples were collected from June 2004 to December 2009.
Environmental Conditions:
QAPP Information: Samples were collected as part of a discharger self monitoring report for NPDES Permit# CA0079138, WDR Orders# R5-2002-0083 and R5-2008-0154.
QAPP Information Reference(s):
 
 
DECISION ID
88470
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Specific Conductivity
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the 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.

Two lines of evidence are available in the administrative record to assess this pollutant. Fifteen of the 1131 samples exceed the California Secondary MCL for MUN, and 464 of the 5308 samples exceed the California Secondary MCL for MUN.

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

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. Fifteen of the 1131 samples exceed the California Secondary MCL for MUN, and 464 of the 5308 samples exceed the California Secondary MCL for MUN and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 88470, Specific Conductivity
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 59401
 
Pollutant: Specific Conductivity
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 1131
Number of Exceedances: 15
 
Data and Information Type: Fixed station physical/chemical monitoring (conventional pollutants only)
Data Used to Assess Water Quality: There were 15 out of the 1,131 samples that had a electrical conductivity level above 900 uS/cm.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
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: Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Six stations (R3, R4, R5, R6, R7, & R8) were sampled in the San Joaquin River in the Stockton Ship Channel, a portion of the Delta between Turner Cut and Stockton.
Temporal Representation: Starting in 2004 through 2009, measurements were recorded weekly for the months of September, October, and November.
Environmental Conditions:
QAPP Information: Laboratory Quality Assurance Manual submitted with data (OMI/Thames Water Stockton Laboratory Quality Assurance Manual).
QAPP Information Reference(s): Quality Assurance Project Plan for City of Stockton - San Joaquin River, Revision 4.20.
 
Line of Evidence (LOE) for Decision ID 88470, Specific Conductivity
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 59394
 
Pollutant: Specific Conductivity
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 5308
Number of Exceedances: 464
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Continuous monitoring data was collected at 4 different stations from 2007-2010. Electrical conductivity data was averaged daily and there were 464 daily averages out of 5308 that were above 900 uS/cm.
Data Reference: Conventional Data for Stockton Deep Water Ship Channel, 2007-2010.
 
SWAMP Data: Non-SWAMP
 
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: Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data were collected at the following station in the water body: NA 40, NA42, NA43, NA48.
Temporal Representation: Samples were collected continuously between 1/1/2007 and 9/30/2010.
Environmental Conditions:
QAPP Information: Stockton Deep Water Channel Demonstration Dissolved Oxygen Aeration Facility Project Quality Assurance Project Plan.
QAPP Information Reference(s): Quality Assurance Project Plan for Stockton Deep Water Ship Channel.
 
 
DECISION ID
89277
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Tetrachloroethylene/PCE
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. Zero of the 42 samples exceed the California Toxics Rule criterion for human health for MUN.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category.

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. Zero of the 42 samples exceed the California Toxics Rule criterion for human health for MUN and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 89277, Tetrachloroethylene/PCE
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62705
 
Pollutant: Tetrachloroethylene/PCE
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 42
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: None of the 42 grab samples exceeded the objective.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: CTR Criterion for Human Health Protection, Sources of Drinking Water (water and fish consumption) value of 0.8 ug/L to assess the data.
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at 6 monitoring stations: RW3- Lat.37.950283 Lon. -121.335875, RW4- Lat. 37.957000 Lon. -121.354328, RW5- Lat.37.968894 Lon. -121.371678, RW6- Lat. 37.986797 Lon. -121.393797, RW7- Lat. 37.997356 Lon. -121.444414, and RW8- Lat. 38.022203 Lon. -121.465503.
Temporal Representation: Grab samples were collected on a quarterly basis from June 2004-December 2009.
Environmental Conditions:
QAPP Information: The laboratory is an operating section of OMI/Thames Water Stockton, Inc (OMI/TW). OMI/TW operates the Wastewater Division of the City of Stockton, Municipal Utilities Department. They submitted a Quality Assurance Manual, dated 03/02/2007.
QAPP Information Reference(s):
 
 
DECISION ID
89126
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. Zero of the 0 samples exceed the California Toxics Rule criterion for WARM.

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 the 0 samples exceed the California Toxics Rule criterion for WARM and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1.
4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 89126, Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62718
 
Pollutant: Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: The reporting limit for all the samples is greater than the evaluation guideline and therefore cannot be used.The 4,4' DDT criterion is applicable to Total DDT. Total DDT is the sum of 4,4- and 2,4-isomers of DDT, DDE, and DDD.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: California Toxics Rule Criteria Freshwater Aquatic Life Protection Continuous Concentration (4-day Average)criteria is 0.001 ug/L.
Guideline Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Spatial Representation: Samples were collected at 6 monitoring stations: RW3- Lat.37.950283 Lon. -121.335875, RW4- Lat. 37.957000 Lon. -121.354328, RW5- Lat.37.968894 Lon. -121.371678, RW6- Lat. 37.986797 Lon. -121.393797, RW7- Lat. 37.997356 Lon. -121.444414, and RW8- Lat. 38.022203 Lon. -121.465503.
Temporal Representation: Grab samples were collected on a quarterly basis from August 2004-December 2009.
Environmental Conditions:
QAPP Information: The laboratory is an operating section of OMI/Thames Water Stockton, Inc (OMI/TW). OMI/TW operates the Wastewater Division of the City of Stockton, Municipal Utilities Department. They submitted a Quality Assurance Manual, dated 03/02/2007.
QAPP Information Reference(s):
 
 
DECISION ID
89355
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Trichloroethylene/TCE
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. Zero of the 42 samples exceed the California Toxics Rule criterion for MUN.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category.

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. Zero of the 42 samples exceed the California Toxics Rule criterion for MUN and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 89355, Trichloroethylene/TCE
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62719
 
Pollutant: Trichloroethylene/TCE
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 42
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: None of the 42 grab samples exceeded the objective.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: CTR Criterion for Human Health Protection, Sources of Drinking Water (water and fish consumption) value of 0.8 ug/L to assess the data.
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at 6 monitoring stations: RW3- Lat.37.950283 Lon. -121.335875, RW4- Lat. 37.957000 Lon. -121.354328, RW5- Lat.37.968894 Lon. -121.371678, RW6- Lat. 37.986797 Lon. -121.393797, RW7- Lat. 37.997356 Lon. -121.444414, and RW8- Lat. 38.022203 Lon. -121.465503.
Temporal Representation: Grab samples were collected on a quarterly basis from June 2004-December 2009.
Environmental Conditions:
QAPP Information: The laboratory is an operating section of OMI/Thames Water Stockton, Inc (OMI/TW). OMI/TW operates the Wastewater Division of the City of Stockton, Municipal Utilities Department. They submitted a Quality Assurance Manual, dated 03/02/2007.
QAPP Information Reference(s):
 
 
DECISION ID
89529
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Turbidity
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the 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.

One line of evidence is available in the administrative record to assess this pollutant. Zero of the 1211 samples exceed the water quality objective for WARM.

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 the 1211 samples exceed the water quality objective for WARM and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 89529, Turbidity
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 62720
 
Pollutant: Turbidity
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 1211
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical monitoring (conventional pollutants only)
Data Used to Assess Water Quality: None of the 1,211 samples exceeded the maximum of 150 NTU.
Data Reference: Data for Conventional Pollutants in the City of Stockton, 2005 - 2009.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: For Delta waters, the general objectives for turbidity apply subject to the following: except for periods of storm runoff, the turbidity of Delta waters shall not exceed 150 NTUs.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Six stations (R3, R4, R5, R6, R7, & R8) were sampled in the San Joaquin River in the Stockton Ship Channel, a portion of the Delta between Turner Cut and Stockton.
Temporal Representation: Starting in 2004 through 2009, measurements were recorded weekly for the months of May through November, and monthly for the months of December through April.
Environmental Conditions:
QAPP Information: According to the included OMI/Thames Water Stockton Laboratory Quality Assurance Manual, dissolved oxygen meters were checked by the Winkler dissolved oxygen method weekly. The method to determine data quality was not described but the QAP states "Dissolved oxygen, electrical conductivity, and pH meters are standardized before use and their performance verified after measurements are made. The values, time and operator's I.D. are recorded on worksheets associated with the tests."
QAPP Information Reference(s):
 
 
DECISION ID
77571
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Dioxin
Final Listing Decision: List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Sources: A Source Unknown
Expected TMDL Completion Date: 2019
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: 303(d) listing decisions made prior to 2006 were not held in an assessment database. The Regional Boards will update this decision when new data and information become available and are assessed.
 
Regional Board Decision Recommendation: This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current cycle. The decision has not changed.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 77571, Dioxin
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 4204
 
Pollutant: Dioxin
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Not Recorded
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference: Placeholder reference pre-2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Unspecified
Objective/Criterion Reference: Placeholder reference pre-2006 303(d)
 
Evaluation Guideline: Unspecified
Guideline Reference: Placeholder reference pre-2006 303(d)
 
Spatial Representation: Unspecified
Temporal Representation: Unspecified
Environmental Conditions: Unspecified
QAPP Information: Unspecified
QAPP Information Reference(s):
 
 
DECISION ID
69424
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Furan Compounds
Final Listing Decision: List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Sources: A Source Unknown
Expected TMDL Completion Date: 2019
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: 303(d) listing decisions made prior to 2006 were not held in an assessment database. The Regional Boards will update this decision when new data and information become available and are assessed.
 
Regional Board Decision Recommendation: This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current cycle. The decision has not changed.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 69424, Furan Compounds
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 4205
 
Pollutant: Furan Compounds
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Not Recorded
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference: Placeholder reference pre-2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Unspecified
Objective/Criterion Reference: Placeholder reference pre-2006 303(d)
 
Evaluation Guideline: Unspecified
Guideline Reference: Placeholder reference pre-2006 303(d)
 
Spatial Representation: Unspecified
Temporal Representation: Unspecified
Environmental Conditions: Unspecified
QAPP Information: Unspecified
QAPP Information Reference(s):
 
 
DECISION ID
69491
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Group A Pesticides
Final Listing Decision: List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Sources: A Source Unknown
Expected TMDL Completion Date: 2011
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: 303(d) listing decisions made prior to 2006 were not held in an assessment database. The Regional Boards will update this decision when new data and information become available and are assessed.
 
Regional Board Decision Recommendation: This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current cycle. The decision has not changed.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 69491, Group A Pesticides
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 4206
 
Pollutant: Group A Pesticides
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Not Recorded
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference: Placeholder reference pre-2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Unspecified
Objective/Criterion Reference: Placeholder reference pre-2006 303(d)
 
Evaluation Guideline: Unspecified
Guideline Reference: Placeholder reference pre-2006 303(d)
 
Spatial Representation: Unspecified
Temporal Representation: Unspecified
Environmental Conditions: Unspecified
QAPP Information: Unspecified
QAPP Information Reference(s):
 
 
DECISION ID
78738
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Invasive Species
Final Listing Decision: List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Sources: A Source Unknown
Expected TMDL Completion Date: 2019
Impairment from Pollutant or Pollution: Pollution
 
Regional Board Conclusion: This pollutant is being considered for placement in Category 4c as impaired by pollution under section 3.10 of the Listing Policy. Under section 3.10 one line of evidence is necessary to assess listing status.

Two lines of evidence are available in the administrative record to assess this pollutant. There have been numerous studies since the late 1960's showing sharp declines in phytoplankton biomass and in native species, such as the delta smelt, which has declined ten-fold over the last 20 years. Non-native species are believed to be responsible, in part, for this alteration in the Delta food web and extirpating native species.

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 in Category 4c as impaired by pollution.

This conclusion is based on the staff findings that:
1. There are numerous studies since the late 1960's.
2. Baseline data is from data acquired from these earlier studies.
3. Trends were determined using statistical analyses on graphs and tables.
4. Summer chlorophyll-a decreased markedly after invasion of the non-native Asian clam. Phytoplankton is a significant source during the spring and summer for many species in the delta.
5. Phytoplankton biomass has declined over the past few decades, affecting food biomass availability for higher tropic levels. Some non-native species compete with zooplankton for food, or alter species composition of the food web. In areas where non-natives are abundant, native fishes are rare or absent.
6. It cannot be determined if the trend in water quality is expected to meet water standards by the next listing cycle.
7. 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: This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current cycle. The decision has not changed.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 78738, Invasive Species
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 578
 
Pollutant: Invasive Species
LOE Subgroup: Population/Community Degradation
Matrix: Water
Fraction: None
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: The Asian clam is the species that was assessed in support of this listing. Thousands of chlorophyll-a measurements have been made in the Delta since the late 1960s and 55-93% of these measurements, depending on the year, are below 10 ug/L. Growth rates of some primary consumers are closely tied to phytoplankton availability below about 10 ug/L. There is a statistically significant downward trend of phytoplankton from 1975-1995 (Jassby et al., 2003). In 1986 the non-native Asian clam invaded Suisun Bay. The Asian clam is a consumer of phytoplankton, changing phytoplankton dynamics in Suisun Bay and the western Delta. Summer chlorophyll decreased markedly after the Asian clam invaded and phytoplankton biomass has declined over the past few decades, affecting food biomass availability for higher tropic levels of the Delta. Some non-native species compete with zooplankton for food, or alter species composition of the food web, affecting native species survival. Recent studies in the central Delta show that introduced fishes dominate (USFWS, 2004. Five-Year Review of Recovery Plan for Delta Smelt. Federal Register 68(148):45270-45271). In areas where non-natives are abundant, native fishes are rare or absent. Over the last 20 years, the native delta smelt population has taken a ten-fold decline in numbers, due in part by non-native species predation and lack of adequate food supply (USFWS, 2004).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. Compliance with this objective will be determined by analyses of indicator organisms, species diversity, population density, growth anomalies, and biotoxicity tests of appropriate duration or other methods as specified by the Regional Water Board. Taken from Region 5 Basin Plan, Page III-8.00, Water Quality Objectives.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The Sacramento-San Joaquin Delta extends from Chipps Island to include leveed and flooded islands; river channels; sloughs; and tidal marshes. Stations were distributed throughout the Delta for sampling by the Dept. of Water Resources to assess water quality, some since the late 1960's.
Temporal Representation: Numerous studies since the late 1960s.
Environmental Conditions: Changes in relative diversity and abundance of native species may also be driven by habitat alteration, flow changes, or hydromodification.
QAPP Information: Peer Reviewed Journal Article and Reports.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 78738, Invasive Species
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 577
 
Pollutant: Invasive Species
LOE Subgroup: Population/Community Degradation
Matrix: Not Specified
Fraction: None
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Fish surveys
Data Used to Assess Water Quality: The species assessed in support of this listing are: fathead minnow, bigscale logperch, catfish, carp, and brook trout. American shad were planted in the Sacramento River in 1871, and by 1879 a commercial fishery had developed. The next successful introductions, in 1872, were carp and brook trout. In 1874, tank cars brought in four species of catfish and two species of black bass. The striped bass became one of the most successful introductions. It became one of the most abundant fish species in the Sacramento-San Joaquin Delta following the planting of a total of 432 fish in 1879 and 1882. The bigscale logperch was introduced into the Central Valley when ponds overflowed during a wet year at Beale Air Force Base. In the Central Valley, the few streams that are now dominated by fathead minnows were probably originally dominated by California roach (Moyle, P.B. 1976).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. Compliance with this objective will be determined by analyses of indicator organisms, species diversity, population density, growth anomalies, and biotoxicity tests of appropriate duration or other methods as specified by the Regional Water Board. Taken from Region 5 Basin Plan, Page III-8.00, Water Quality Objectives.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The Sacramento-San Joaquin Delta extends from Chipps Island to include leveed and flooded islands; river channels; sloughs; and tidal marshes.
Temporal Representation:
Environmental Conditions: Changes in relative diversity and abundance of native species may also be driven by habitat alteration, flow changes, or hydromodification.
QAPP Information: Peer Reviewed Journal Article and Reports.
QAPP Information Reference(s):
 
 
DECISION ID
69705
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Chlorpyrifos
Final Listing Decision: List on 303(d) list (being addressed by USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (being addressed by USEPA approved TMDL)(2016)
Revision Status Original
Sources: A Source Unknown
TMDL Name: Delta Diazinon and Chlorpyrifos Project
TMDL Project Code: 185
Date TMDL Approved by USEPA: 10/10/2007
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: There is sufficient justification to place this pollutant the Being Addressed portion of the 303(d) list because a TMDL has been completed and approved by RWQCB and USEPA, and is expected to result in attainment of the standard..

The Sacramento San Joaquin Delta Diazinon and Chlorpyrifos TMDL has been approved by the Central Valley Water Board in 2006 and approved by USEPA on 10 October 2007.
 
Regional Board Decision Recommendation: This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current cycle. The decision has not changed.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 69705, Chlorpyrifos
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 580
 
Pollutant: Chlorpyrifos
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
 
DECISION ID
68918
Region 5     
Delta Waterways (Stockton Ship Channel)
 
Pollutant: Diazinon
Final Listing Decision: List on 303(d) list (being addressed by USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (being addressed by USEPA approved TMDL)(2016)
Revision Status Original
Sources: A Source Unknown
TMDL Name: Delta Diazinon and Chlorpyrifos Project
TMDL Project Code: 185
Date TMDL Approved by USEPA: 10/10/2007
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: There is sufficient justification to place this pollutant the Being Addressed portion of the 303(d) list because a TMDL has been completed and approved by RWQCB and USEPA, and is expected to result in attainment of the standard..

The Sacramento San Joaquin Delta Diazinon and Chlorpyrifos TMDL has been approved by the Central Valley Water Board in 2006 and approved by USEPA on 10 October 2007.
 
Regional Board Decision Recommendation: This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current cycle. The decision has not changed.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 68918, Diazinon
Region 5     
Delta Waterways (Stockton Ship Channel)
 
LOE ID: 581
 
Pollutant: Diazinon
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):