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

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

SF Bay Area Mercury TMDLs

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

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

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

Soulajule Watershed Allocations: 0.04 ng/l methylmercury in reservoir 0.5 mg/kg particulate mercury discharged Implementation actions: Evaluate and resolve problem

Downstream Depositional Areas Allocation: 0.5 mg/kg total mercury in sediment Management question C: How will erosion control & riparian restoration affect MeHg?

Tomales Bay Mercury, Nutrients & Siltation TMDL

Guadalupe & SF Bay Hg TMDLs

Guadalupe River Watershed Hg TMDL

SF Bay Hg TMDL

Sources, Loads, and Allocations

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

Next: Central Valley Hg TMDLs