Date post: | 27-Mar-2015 |
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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
WDRsWaiversProhibitions
Review- Monitoring Results- Mgmt. Plans
Water QualityImprovement
SF Bay Area Mercury TMDLs
Walker Creek Fish Tissue Mercury Water Quality Objectives
For smaller preyfish0.05 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: Allocation: 5 mg/kg total mercury in sediment5 mg/kg total mercury in sediment
Management action: Management action: erosion controlerosion control
Remediation Reduced Gambonini Mine Mercury Loads by 90%
Mine Remediation Post-Remediation
Soulajule Watershed
Allocations: 0.04 ng/l methylmercury in reservoir0.5 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 AllocationsSources, Loads, and Allocations
0
200
400
600
800
1,000
(kilograms per year)
Current Load Allocation
BE = Bed Erosion
CV = Central Valley
G = Guadalupe
G
BE
cv
G
cv
BE
113
1711
0
40
80
120
Municipal Wastewater
1970 Load (Estimated)
Current Load
Allocation
New Water Quality Objectives in SF Bay
0.2 ppm mercury in large predator fish
0.03 ppm mercuryin prey fish
California least tern
Next: Central Valley Hg TMDLs