Regulatory Update

1
Regulatory Update

• Carrie Austin, SF Bay Water Board
• Michelle Wood, CV Water Board

2
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 larger preyfish 0.1 mg Hg/kg fish

• For smaller preyfish
• 0.05 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 restoration affect MeHg?

9
Tomales Bay Mercury, Nutrients Siltation TMDL
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Guadalupe SF Bay Hg TMDLs
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Guadalupe River Watershed Hg TMDL
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SF Bay Hg TMDL
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Sources, Loads, and Allocations
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New Water Quality Objectives in SF Bay
0.2 ppm mercury in large predator fish
0.03 ppm mercuryin prey fish
California least tern
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Next Central Valley Hg TMDLs