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

# Supporting Information

## Regional Board 5 - Central Valley Region

Water Body Name: | Thermalito Afterbay
Water Body ID: | CAL5154000020000209142817
Water Body Type: | Lake & Reservoir

DECISION ID | 11661
Pollutant: | DDT
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | New Decision
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Weight of Evidence: | This pollutant is being considered for placement on the section 303(d) list under section 3.1 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. None of the samples exceed the water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of 3 samples exceeded the OEHHA 2008 Screening value of 21 μg/kg total DDT of wet weight for fish tissue 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.
RWQCB Board Decision / Staff Recommendation: | After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 11661

LOE ID: | 23367
Pollutant: | DDT
LOE Subgroup: | Pollutant-Tissue
Matrix: | Tissue
Fraction: | Total
Beneficial Use: | Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples: | 3
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Asses Water Quality: | Three samples were collected from Lake Oroville, South Thermalito Afterbay (Ski Cove) in 2003. Two Large Mouth Bass and one Common Carp fish were analyzed for total DDT (DDD,o,p¿, DDD,p,p¿, DDE,p,p¿, DDMU,p,p¿). The OEHHA 2008 fish contaminant goal was used to evaluate presence of an exceedance. None of the available three fish samples exceeded the OEHHA 2008 Screening value of 21 µg/kg total DDT wet weight for fish tissue.
Data Reference: | Oroville Facilities Relicensing-FERC Project No. 2100. Contaminant accumulation in fish, sediments, and the aquatic food chain. Sacramento, CA: State of CA Department of Water Resources
Water Quality Objective/Criterion: | Total identifiable persistent chlorinated hydrocarbon pesticides shall not be present in the water column at concentrations detectable within the accuracy of analytical methods approved by the Environmental Protection Agency or the Executive Officer (CVRWQCB, 2007).
Objective/Criterion Reference: | Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region
Evaluation Guideline: | OEHHA 2008 Screening value of 21 µg/kg total DDT wet weight for fish tissue
Guideline Reference: | Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Spatial Representation: | Samples were collected from monitoring sites from Feather river tributaries above Lake Oroville and within Lake Oroville (Butte County)
Temporal Representation: | Samples were collected in 2003.
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with Central Valley Water Board Monitoring and Reporting Program (order number-2003-0826) requirements (CVRWQCB, 2003).
QAPP Information Reference(s):

DECISION ID | 11659
Pollutant: | Lead
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | New Decision
Revision Status | Revised
Impairment from Pollutant or Pollution: | Pollutant
Weight of Evidence: | This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. None of the samples exceed the water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of 26 samples exceeded the Basin Plan 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.
RWQCB Board Decision / Staff Recommendation: | After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 11659

LOE ID: | 21897
Pollutant: | Lead
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Dissolved
Beneficial Use: | Warm Freshwater Habitat
Aquatic Life Use: | Warm Freshwater Habitat
Number of Samples: | 26
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Asses Water Quality: | 26 samples were taken from Thermalito North Afterbay between 2003 and 2004. None of 26 samples exceed guidelines for dissolved lead.
Data Reference: | Project effects on water quality designated beneficial uses for surface waters, and results for bacterial monitoring of swimming areas in 2003. FERC Project No. 2100. Sacramento, CA: State of CA Department of Water Resources
Water Quality Objective/Criterion: | California Toxics Rule Criteria (USEPA) - Freshwater Aquatic Life ProtectionContinuous Concentration (4-day Average) calculated based on the following formula: (e(1.273xLN(hardness))-4.705)x((1.46203-LN(hardness))x0.145712)U.S. Environmental Protection Agency, Federal Register, Volume 65, No. 97 (Thursday, 18 May 2000), pp. 31682-31719 [California Toxics Rule]; and Federal Register, Volume 66, No. 30 (Tuesday, 13 February 2001), pp. 9960-9962 [California Toxics Rule Correction] http://www.gpoaccess.gov/fr/browse.html.
Objective/Criterion Reference: | Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
| Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected from Thermalito North Afterbay.
Temporal Representation: | Samples were collected from April 2002 through April 2004. Samples were collected at monthly intervals.
Environmental Conditions: |
QAPP Information: | Data quality: Excellent. Quality Control for all of the elements described in section 6.1.4 of the Policy was conducted in accordance with the Laboratory QAPP developed by the State of California Resources Agency Department of Water Resources (DWR, 2005). Quality Assurance Project Plan for Oroville Facilities Relicensing FERC Project No. 2100 SP-W1. Department of Water Resources (DWR). Oroville Facilities Relicensing FERC Project No. 2100. January 2005.
QAPP Information Reference(s):

DECISION ID | 11662
Pollutant: | Mercury
Final Listing Decision: | List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | New Decision
Revision Status | Revised
Sources: | Resource Extraction
Expected TMDL Completion Date: | 2021
Impairment from Pollutant or Pollution: | Pollutant
Weight of Evidence: | This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. Three of the samples exceed the water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Three of 33 fish samples exceed the USEPA fish tissue criterion for human health and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. In addition, zero out of 49 water samples exceed the USEPA (CTR) mercury-based numeric criterion for human health. This number of exceedances 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.
RWQCB Board Decision / Staff 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.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 11662

LOE ID: | 22073
Pollutant: | Mercury
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples: | 49
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Asses Water Quality: | A total of 128 water samples were collected at three locations from Thermalito Afterbay representing fourty-nine 30-day average samples. None of the fourty-nine 30-day average samples exceeded the USEPA (CTR) mercury-based numeric criterion for human health. The total recoverable mercury concentrations in water ranged from 0.2 ng/l to 9.6 ng/l with an average of 1.0 ng/l for the fourty-nine 30-day average samples.
Data Reference: | Reports, data files, and QAPP documentation for characterization of surface waters of Lake Oroville and the Feather River (Butte County), associated with the Oroville Facilities Hydroelectric Project (FERC #2100).
Water Quality Objective/Criterion: | The USEPA (CTR) numeric criterion for the protection of human health for the consumption of both water and fish that live in the water is 50 ng/l (30-day average) for total recoverable mercury (40 CFR 131.38).
Objective/Criterion Reference: | Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
| Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected at three locations from the Thermalito Afterbay: the northern region, southern region and the outlet to the Feather River.
Temporal Representation: | Water samples were collected during 51 sampling events from 3/28/2002 to 4/22/2004.
Environmental Conditions: | Significant gold mining activity occurred during the Gold Rush era at areas nearby and upstream of Thermalito Afterbay (USGS, 2005).
QAPP Information: | Data quality: Excellent. Quality Control for all of the elements described in section 6.1.4 of the Policy was conducted in accordance with the QAPP developed by the State of California Resources Agency, Department of Water Resources (DWR, 2005).
QAPP Information Reference(s):
LOE ID: | 22072
Pollutant: | Mercury
LOE Subgroup: | Pollutant-Tissue
Matrix: | Tissue
Fraction: | Total
Beneficial Use: | Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples: | 33
Number of Exceedances: | 3
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Asses Water Quality: | Fish were sampled for tissue analysis at two locations from the Thermalito Afterbay. A total of 3 out of 33 samples exceeded the USEPA fish tissue criterion for human health. 1) North Thermalito Afterbay: The average wet weight mercury concentration in fish tissue was 0.17 ppm for the 17 samples collected at this location. The number of fish collected per sample, the measured mercury concentrations in fish tissue, and the number of exceedances are, by species: Bluegill- one 2-fish composite sample, 0.05 ppm, no exceedances; Carp- 5 samples, 0.1-0.21 ppm (average 0.16 ppm), no exceedances; Largemouth Bass- 9 samples, 0.13-0.4 ppm (average 0.21 ppm), 1 exceedance; Redear Sunfish- 2 samples, 0.03 and 0.05 ppm, no exceedances. 2) South Thermalito Afterbay: The average wet weight mercury concentration in fish tissue was 0.21 ppm for the 16 samples collected at this location. The number of fish collected per sample, the measured mercury concentrations in fish tissue, and the number of exceedances are, by species: Carp- one 5-fish composite sample, 0.13 ppm, no exceedances; Largemouth Bass- 15 samples, 0.1-0.53 ppm (average 0.21 ppm), 2 exceedances. All 33 composite and individual samples were collected from fish with total lengths greater than 150 mm, which represent fish most commonly caught and consumed by sport fishers and their families.
Data Reference: | Reports, data files, and QAPP documentation for characterization of surface waters of Lake Oroville and the Feather River (Butte County), associated with the Oroville Facilities Hydroelectric Project (FERC #2100).
Water Quality Objective/Criterion: | All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. The objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances.
Objective/Criterion Reference: | Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region
Evaluation Guideline: | The USEPA Fish Tissue Residue Criterion for methylmercury in fish is 0.3 mg/kg (0.3 ppm) for the protection of human health. This is the concentration in fish tissue that should not be exceeded based on a total fish and shellfish consumption-weighted rate of 0.0175 kg fish/day. (USEPA, 2001)
Guideline Reference: | Water Quality Criterion for the Protection of Human Health: Methylmercury. Final. United States Environmental Protection Agency Office of Science and Technology Office of Water. EPA-823-R-01-001. January 2001
Spatial Representation: | Samples were collected at two locations from the Thermalito Afterbay: in the northern region and in the southern region near Ski Cove.
Temporal Representation: | Fish samples were collected during two sampling events: from 4/16/2003 to 4/17/2003, and on 6/2/2003.
Environmental Conditions: | Significant gold mining activity occurred during the Gold Rush era at areas nearby and upstream of Thermalito Afterbay (USGS, 2005).
QAPP Information: | Data quality: Good.. Quality control for sample collection, preparation, handling, and analyses were conducted in accordance with the Surface Water Ambient Monitoring Program Quality Assurance Program Plan (Puckett, 2002) with the following exception: instead of wrapping fish in Teflon sheets before being frozen and transported to the laboratory, the fish were wrapped in aluminum foil (dull side to skin). This wrapping method should not have affected mercury concentrations. Quality control procedures for selection of target fish species and compositing of samples followed the General Protocol for Sport Fish Sampling and Analysis developed by OEHHA (Gassel and Brodberg, 2005).
QAPP Information Reference(s):

DECISION ID | 11663
Pollutant: | PCBs (Polychlorinated biphenyls)
Final Listing Decision: | List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | New Decision
Revision Status | Revised
Sources: | Source Unknown
Expected TMDL Completion Date: | 2021
Impairment from Pollutant or Pollution: | Pollutant
Weight of Evidence: | This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. Eight of the samples exceed the water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Five of 7 composite fish and crayfish tissue samples collected at three locations in Thermalito Afterbay in 2002 exceed the OEHHA fish contaminant goal for human health and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. In addition, 3 out of 4 fish tissue samples collected at two locations in Thermalito Afterbay in 2003 exceed the OEHHA fish contaminant goal for human health 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.
RWQCB Board Decision / Staff 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.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 11663

LOE ID: | 21834
Pollutant: | PCBs (Polychlorinated biphenyls)
LOE Subgroup: | Pollutant-Tissue
Matrix: | Tissue
Fraction: | Fish whole body
Beneficial Use: | Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples: | 7
Number of Exceedances: | 5
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Asses Water Quality: | Samples were analyzed for the presence of 48 individual PCB congeners and Aroclors 1254 and 1260. Data evaluated were the sum of PCB congeners (¿total PCBs¿), reported as ng/g, wet weight. OEHHA and SWAMP recommend use of total PCBs for evaluating contamination.Samples were collected at three locations in Thermalito Afterbay:Northern Region: 1 of 1 composite crayfish sample exceeded 3.6 ng/g; concentrations was 7.3 ng/g.Southern Region (Ski Cove): 1 of 1 composite crayfish sample and 2 of 2 fish samples exceeded 3.6 ng/g; concentrations were 5.6 and 112.4 ng/g in largemouth bass and common carp composites, respectively. Potter¿s Pond: 1 of 1 composite common carp sample and 0 of 2 largemouth bass composite samples exceeded 3.6 ng/g. Concentrations were 22.5 ng/g in the common carp and 1.9 and 3.4 ng/g in the largemouth bass samples. Fish collected had fork lengths greater than 240 mm. Composites were composed of fish with no greater than 25% difference in fork length between the largest and smallest fish.
Data Reference: | Oroville Facilities Relicensing-FERC Project No. 2100. Contaminant accumulation in fish, sediments, and the aquatic food chain. Sacramento, CA: State of CA Department of Water Resources
Water Quality Objective/Criterion: | All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. The objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances.
Objective/Criterion Reference: | Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region
Evaluation Guideline: | The California Office of Environmental Health Hazard Assessment (OEHHA) Fish Contaminant Goal for total PCBs in fish is 3.6 ng/g (3.6 ppb), wet weight, to protect human health. This concentration in fish tissue should not be exceeded, based on a total fish and shellfish consumption rate of 8 ounces (prior to cooking) per week (32 g fish/day) (OEHHA, 2008). This fish contaminant goal incorporates a maximum cancer risk level of one in a million (no more than one additional cancer in a population of one million people consuming these fish).
Guideline Reference: | Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Spatial Representation: | Samples were collected in the northern and southern regions of Thermalito Afterbay. Fish were not found in the northern region, but crayfish were sampled there.
Temporal Representation: | Samples were collected on: 05/28/02, 09/12/02, 09/13/02, 09/18-20/02 and 12/03/02. PCBs have been used in the Feather River watershed in electric power generation and in other activities. Some remediation was performed for two contamination events that occurred in the 1980s: PCB-containing oil applied to a dirt road entered the Ponderosa Reservoir in surface runoff (South Fork Feather River) and PCBs contaminated the soil and water at Belden Forebay (North Fork Feather River) after a landslide damaged powerhouses (CVRWQCB, 1987).
Environmental Conditions: |
QAPP Information: | Data quality: Acceptable.. Quality Control for all of the elements described in section 6.1.4 of the Policy was conducted in accordance with the Laboratory QAPP developed by the State of California Resources Agency Department of Water Resources (DWR, 2005). Quality Assurance Project Plan for Oroville Facilities Relicensing FERC Project No. 2100 SP-W1. Department of Water Resources (DWR). Oroville Facilities Relicensing FERC Project No. 2100. January 2005.
QAPP Information Reference(s):
LOE ID: | 21835
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: | 4
Number of Exceedances: | 3
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Asses Water Quality: | Samples were analyzed for the presence of 48 individual PCB congeners and Aroclors 1254 and 1260. Data evaluated were the sum of PCB congeners (¿total PCBs¿), reported as ng/g, wet weight. OEHHA and SWAMP recommend use of total PCBs for evaluating contamination.Samples were collected at two locations in Thermalito Afterbay:Northern Region: 0 of 1 composite largemouth bass sample exceeded 3.6 ng/g; concentrations was 3.2 ng/g total PCBs.Southern Region (Ski Cove): 3 of 3 composite fish samples exceeded 3.6 ng/g. The concentration of the largemouth bass composite was 6.9 ng/g total PCBs. Concentrations in the common carp composites were 39.7 and 93.6 ng/g total PCBs. The fish sampled had total lengths greater than 150 mm. Composite samples were comprised of fillet samples from up to 12 individual fish of the same species. Composites were composed of fish with no greater than 25% difference in fork length between the largest and smallest fish.
Data Reference: | Oroville Facilities Relicensing-FERC Project No. 2100. Contaminant accumulation in fish, sediments, and the aquatic food chain. Sacramento, CA: State of CA Department of Water Resources
Water Quality Objective/Criterion: | All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. The objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances.
Objective/Criterion Reference: | Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region
| California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring. http://www.cdph.ca.gov/certlic/drinkingwater/Pages/Lawbook.aspx
Evaluation Guideline: | The California Office of Environmental Health Hazard Assessment (OEHHA) Fish Contaminant Goal for total PCBs in fish is 3.6 ng/g (3.6 ppb), wet weight, to protect human health. This concentration in fish tissue should not be exceeded, based on a total fish and shellfish consumption rate of 8 ounces (prior to cooking) per week (32 g fish/day) (OEHHA, 2008). This fish contaminant goal incorporates a maximum cancer risk level of one in a million (no more than one additional cancer in a population of one million people consuming these fish).
Guideline Reference: | General Protocol for Sport Fish Sampling and Analysis. Pesticide and Environmental Toxicology Branch. Office of Environmental Health Hazard Assessment. California Environmental Protection Agency. December 2005
Spatial Representation: | Samples were collected in northern and southern regions of Thermalito Afterbay.
Temporal Representation: | Fish samples were collected on 04/17/03 and 06/11/03.PCBs were used in the Feather River watershed in electric power generation and other activities. See also first line of evidence. .
Environmental Conditions: |
QAPP Information: | Data quality: Acceptable..
QAPP Information Reference(s):