| Pollutant: |
Mercury |
| Final Listing Decision: |
List on 303(d) list (being addressed by USEPA approved TMDL) |
| Last Listing Cycle's Final Listing Decision: |
New Decision |
| Revision Status |
Revised |
| Sources: |
Historic Land Management Activities |
| TMDL Name: |
Suisun Marsh Dissolved Oxygen and Mercury TMDL |
| TMDL Project Code: |
553 |
| Date TMDL Approved by USEPA: |
12/31/2018 |
| Impairment from Pollutant or Pollution: |
Pollutant |
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| Regional Board Conclusion: |
Cordellia Slough is part of the Suisun Marsh system. As such, the mercury and dissolved oxygen impairments for Suisun Marsh are applicable to sloughs within the marsh. Further, the TMDL for Suisun Marsh will resolve these impairments for sloughs within the Suisun Marsh system. Accordingly, the mercury impairment in Cordellia Slough will be addressed and resolved by the Suisun Marsh TMDL for dissolved oxygen approved by USEPA on 12/31/2018. |
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| 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. |
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Line of Evidence (LOE) for Decision ID 100848, Mercury
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Region 2 |
Cordellia Slough, unnamed tributary |
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| LOE ID: |
125243 |
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| Pollutant: |
Mercury |
| LOE Subgroup: |
Pollutant-Water |
| Matrix: |
Water |
| Fraction: |
None |
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| Beneficial Use: |
Estuarine Habitat |
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| Number of Samples: |
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| Number of Exceedances: |
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| Data and Information Type: |
Not Specified |
| Data Used to Assess Water Quality: |
This is a placeholder LOE to allow Cordellia Slough mercury impairment to be associated with the TMDL for Suisun Marsh |
| Data Reference: |
Staff Report for Proposed Basin Plan Amendment - Establish Water Quality Objectives and a Total Maximum Daily Load for Dissolved Oxygen in Suisun Marsh and add Suisun Marsh to the SF Bay Mercury TMDL |
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| SWAMP Data: |
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| Water Quality Objective/Criterion: |
This is a placeholder LOE to allow Cordellia Slough mercury impairment to be associated with the TMDL for Suisun Marsh. This placeholder LOE will fulfill database requirements to create a listing for Cordellia Slough. This slough listing will subsequently be associated with the TMDL for Suisun Marsh - which aims to resolve the mercury and low DO/organic enrichment impairments. Cordellia Slough is part of the Suisun Marsh system so resolution of the Suisun Marsh impairments will resolve those in Cordellia Slough as well. |
| Objective/Criterion Reference: |
Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) |
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| Evaluation Guideline: |
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| Guideline Reference: |
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| Spatial Representation: |
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| Temporal Representation: |
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| Environmental Conditions: |
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| QAPP Information: |
This is a placeholder LOE to allow Cordellia Slough mercury impairment to be associated with the TMDL for Suisun Marsh. |
| QAPP Information Reference(s): |
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