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

# Supporting Information

## Regional Board 5 - Central Valley Region

Water Body Name: | American River, South Fork (below Slab Creek Reservoir to Folsom Lake)
Water Body ID: | CAR5143206020060808153403
Water Body Type: | River & Stream

DECISION ID | 6781
Pollutant: | Mercury
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)(2006)
Revision Status | Original
Sources: | Resource Extraction
Expected TMDL Completion Date: | 2021
Impairment from Pollutant or Pollution: | Pollutant
Weight of Evidence: | This pollutant is being considered for removal from the section 303(d) list under sections 4.1 and 4.5 of the Listing Policy. Under section 4.1, a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess 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 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.
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 removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 6781

LOE ID: | 2595
Pollutant: | Mercury
LOE Subgroup: | Pollutant-Tissue
Matrix: | Tissue
Fraction: | Total
Beneficial Use: | Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples: | 24
Number of Exceedances: | 11
Data and Information Type: | Fish tissue analysis
Data Used to Asses Water Quality: | Eleven of 24 samples exceeded the mercury tissue guideline. Fish tissue was analyzed from Sacramento pike minnow, rainbow trout, and brown trout. The reporting limit was 0.01 mg/kg (CDFG, 2005).
Data Reference: | Placeholder reference 2006 303(d)
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: | Placeholder reference 2006 303(d)
Evaluation Guideline: | An OEHHA guideline of 0.3 mg/kg wet weight was used (Brodberg and Pollock, 1999).
Guideline Reference: | Placeholder reference 2006 303(d)
Spatial Representation: | Samples were collected in one location in the Camp Lotus reach of the South Fork of the American River and at Slab Creek Reservoir.
Temporal Representation: | Samples were collected between 6/15/2004 and 7/29/2004.
Environmental Conditions: |
QAPP Information: | DFG Office of Spill Prevention and Response Laboratory QAPP. Data quality requirements acceptable.
QAPP Information Reference(s):
LOE ID: | 2594
Pollutant: | Mercury
LOE Subgroup: | Testimonial Evidence
Matrix: | Not Specified
Fraction: | None
Beneficial Use: | Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples: | 0
Number of Exceedances: | 0
Data and Information Type: | Not Specified
Data Used to Asses Water Quality: | Information from RWQCB staff: The listing should start below Slab Creek Reservoir and extend to Folsom Lake.
Data Reference: | Placeholder reference 2006 303(d)
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):