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DECISION ID |
5349 |
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| Pollutant: |
Mercury |
| 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 (TMDL required list)(2006) |
| Revision Status |
Revised |
| Sources: |
Source Unknown |
| TMDL Name: |
Walker Creek Mercury |
| TMDL Project Code: |
69 |
| Date TMDL Approved by USEPA: |
09/29/2008 |
| Impairment from Pollutant or Pollution: |
Pollutant |
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| Weight of Evidence: |
Walker Creek Mercury TMDL has been developed and approved by USEPA (9/29/2008) and an approved implementation plan is expected to result in attainment of the standard. This provides a sufficient justification in favor of placing this water segment-pollutant combination in the Water Quality Limited Segments Being Addressed portion of the section 303(d) list. |
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| RWQCB Board Decision / Staff Recommendation: |
Water Board staff conclude that the water body should be placed in the Water Quality Limited Segments Being Addressed category of the section 303(d) list because a TMDL has been approved by USEPA and an approved implementation plan is in place. |
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| SWRCB Board Decision / Staff Recommendation: |
After review of the available data and information, SWRCB 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. |
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| USEPA Decision: |
|
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| LOE ID: |
668 |
| |
| Pollutant: |
Mercury |
| LOE Subgroup: |
Pollutant-Tissue |
| Matrix: |
Tissue |
| Fraction: |
Total |
| |
| Beneficial Use: |
Commercial or recreational collection of fish, shellfish, or organisms |
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| Number of Samples: |
14 |
| Number of Exceedances: |
12 |
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| Data and Information Type: |
Fish tissue analysis |
| Data Used to Assess Water Quality: |
Twelve out of 14 samples exceeded. A total of 8 composite samples were collected and analyzed from Soulejule Reservoir - 3 black crappie and 5 largemouth bass. In addition, 4 individual largemouth bass and 2 individual channel catfish were sampled. Two channel catfish samples did not exceed (TSMP, 2002). |
| Data Reference: |
Placeholder reference 2006 303(d) |
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| Water Quality Objective/Criterion: |
San Francisco Bay RWQCB Basin Plan: Many pollutants can accumulate on particles, in sediment, or bioaccumulate in fish and other aquatic organisms. Controllable water quality factors shall not cause a detrimental increase in concentrations of toxic substances found in bottom sediments or aquatic life. Effects on aquatic organisms, wildlife, and human health will be considered. |
| Objective/Criterion Reference: |
Placeholder reference 2006 303(d) |
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| Evaluation Guideline: |
'Mercury 0.3 ug/g (OEHHA Screening Value). |
| Guideline Reference: |
Placeholder reference 2006 303(d) |
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| Spatial Representation: |
One station. |
| Temporal Representation: |
All samples were collected on 9/20/2001. |
| Environmental Conditions: |
|
| QAPP Information: |
Environmental Chemistry Quality Assurance and Data Report for the Toxic Substances Monitoring Program, 2001-2002. Department of Fish and Game. |
| QAPP Information Reference(s): |