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Regulatory Update

Stay informed about the latest regulatory updates on mercury TMDLs, mine site remediation, and water quality assessments in the SF Bay Area. Learn about implementation plans, monitoring results, and management processes.

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Regulatory Update

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  1. Regulatory Update Carrie Austin, SF Bay Water Board Michelle Wood, CV Water Board

  2. Water Quality Improvement Assessment Evaluation Planning Implementation Water Quality Management Process Special Discharger Studies Monitoring CWA 303(d) Review - Monitoring Results - Mgmt. Plans • Basin Plan • Uses • Objectives • Impl. Program • TMDLs WDRs Waivers Prohibitions

  3. SF Bay Area Mercury TMDLs

  4. Walker Creek Fish Tissue Mercury Water Quality Objectives For smaller preyfish 0.05 mg Hg/kg fish • For larger preyfish • 0.1 mg Hg/kg fish

  5. Mercury Mine Wastes Gambonini Mine Site Soulajule Watershed Mines Downstream Depositional Areas

  6. Remediation Reduced Gambonini Mine Mercury Loads by 90% Mine Remediation Post-Remediation Allocation: 5 mg/kg total mercury in sediment Management action: erosion control

  7. Soulajule Watershed Allocations: 0.04 ng/l methylmercury in reservoir0.5 mg/kg particulate mercury discharged Implementation actions: Evaluate and resolve problem

  8. Downstream Depositional Areas Allocation: 0.5 mg/kg total mercury in sediment Management question ‘C’: How will erosioncontrol & riparian restorationaffect MeHg?

  9. Tomales Bay Mercury, Nutrients & Siltation TMDL

  10. Guadalupe & SF Bay Hg TMDLs

  11. Guadalupe River Watershed Hg TMDL

  12. SF Bay Hg TMDL

  13. Sources, Loads, and Allocations

  14. New Water Quality Objectives in SF Bay 0.2 ppm mercury in large predator fish 0.03 ppm mercuryin prey fish California least tern

  15. Next: Central Valley Hg TMDLs

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