Water Quality in San Francisco Bay J.A. Davis San Francisco Estuary Institute.
Jan 17, 2018
u u Non-profit scientific organization u Programs: –Contaminant Monitoring and Research Program »Regional Monitoring Program »Aquatic Pesticide Monitoring Program –Regional Watershed Science Program –Regional Wetlands Monitoring Program –Biological Invasions
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San Francisco Estuary Institute www.sfei.org Non-profit scientific organization Programs:
– Contaminant Monitoring and Research Program» Regional Monitoring Program » Aquatic Pesticide Monitoring Program
– Regional Watershed Science Program– Regional Wetlands Monitoring Program– Biological Invasions
Regional Monitoring Program
Innovative partnership between government, dischargers, and scientists
Work closely with the Regional Board $ 3 million/year of stable funding Began in 1993 World class monitoring Major change in direction beginning in 2002
RMP Objectives Compare monitoring information to relevant water quality
objectives and other guidelines Describe patterns and trends in contaminant concentration and
distribution Describe general sources and loading of contamination to the
Estuary Measure contaminant effects on selected parts of the Estuary
ecosystem Synthesize and distribute information from a range of sources to
present a more complete picture of the sources, distribution, fates, and effects of contaminants in the Estuary ecosystem
RMP Components Water Chemistry Aquatic Toxicity Sediment Chemistry Sediment Toxicity Bivalve Bioaccumulation Fish Pilot Studies Special Studies
303(d) Listed Chemicals Draft list from 11/01 High Priority
– Mercury, PCBs Medium
– Chlordane, DDT, Dieldrin, Diazinon Low
– Selenium, Dioxins, Furans, Dioxin-like PCBs
303(d) “B” Listed Chemicals Draft list from 11/01
– Copper– Nickel– PAHs– PBDEs– Sediment Toxicity
PCB Concentrations in San Francisco Bay Fish Fillets, 2000
Mercury Concentrations in San Francisco Bay Fish Fillets, 2000
Contaminant N Percent AbovePCBs 80 90%Mercury 134 38%Dieldrin 80 19%Selenium 12 17%DDTs 80 4%Chlordanes 80 0%Dioxins Not yet available
Comparisons to Screening Values
Combined External Loads
Volatilization
Outflow
Dissolved PCB
Sorbed PCB
Dissolved PCB
Sorbed PCB
Burial
Water
Active Sediment Layer
Buried Sediment
Dissolved PCB
Particulate PCB
DegradationDegradation
Degradation DiffusionDeposition
andResuspension
Conceptual Model of PCB Fate in the Bay
Predicted Long Term Trends in PCB Mass with Varying Loads
Year
0 10 20 30 40 50 60 70 80 90 100
PC
B M
ass
in B
ay (k
g)
0
500
1000
1500
2000
2500
3000
50% of present
25% of present
10% of present
80 kg
40 kg
20 kg10 kg 0 kg
New Contaminants of Concern: Flame Retardants
O
Br BrBr Br
Br Br
O
Br BrBr Br
Br
O
Br Br
Br Br
TetraBDE PentaBDE
HexaBDE
Sources: textiles, household and industrial productsUse: reduces flame capacity of materialsMax level: ppt (ng/L) Sacramento River waterConcern: endocrine system disruption, bioaccumulation
P
O
O
O
O
Triphenylphosphate
My Water Quality Report Card for the Bay
Getting Better DDT, chlordane
Sloooow improvement PCBs
Staying the Same Hg
Getting Worse PBDEs (?), Pyrethroids (?)
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