Dioxin Sources, Loadings, and Inventory Data for

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Dioxin Sources, Loadings, and Inventory Data for
San Francisco Bay
RMP Technical Review Committee Meeting March
18th, 2008
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Draft Data Do not cite or quote
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Past and Projected Dioxin and Furan Emissions in
the US
(Peek et al 2002)
Draft Data Do not cite or quote
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Sources of Dioxins and Furan Emissions in the San
Francisco Bay Area
(BAAQMD 2002)
g TEQ/year
Draft Data Do not cite or quote
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Stormwater is the Dominant Pathway
High uncertainty due to lack of data
Draft Data Do not cite or quote
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Local Watershed/Stormwater Data

• 1995-1996 wet season
• Runoff from 2 storm events at 13 outfalls in Bay
  Area
• Hourly sampling of storm drains from 2 sites
  (Oakland and Benicia) during one storm event
• High variability in dioxin concentrations

Wenning et al. 1999 and SFRWQCB 1997
Draft Data Do not cite or quote
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Draft Data Do not cite or quote
Wenning et al. 1999
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Direct Atmospheric Deposition Data

• Based on limited BAAQMD data set?
• California Ambient Dioxin Air Monitoring Program
• Administered by CARB
• Data from December 2002-2004/2005
• Ambient monitoring for dioxins and dioxin-like
  compounds at multiple locations statewide
• Focuses on urban areas
• 5 sites in SF Bay area
• Identification of potential sources
• Direct deposition data?

Draft Data Do not cite or quote
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Dioxins in Ambient Air
Typical Congener Profiles
Furans
Dioxins
Patterns were similar among sites
California Ambient Dioxin Air Monitoring Program
Data Analysis, Draft Report by Sonoma
Technology, Inc, February 2008
Draft Data Do not cite or quote
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Dioxins in Ambient Air
Draft Data Do not cite or quote
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Municipal Effluent Data
Draft Data Do not cite or quote
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Municipal Effluent Data
Draft Data Do not cite or quote
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Petroleum Refinery Effluent Loading Data
SFRWQCB data
Draft Data Do not cite or quote
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Central Valley Loading Data
2002-2003 2 wet season, 2 dry season events
(SFEI 2003)
Draft Data Do not cite or quote
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Draft Data Do not cite or quote
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Sources of Uncertainty in Loading Estimates

• Limited data
• Chemical analysis
• Congeners below detection limits
• Extrapolation to other facilities, tributaries,
  etc.
• Erosion of buried sediment

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2000 NOAA EMAP Sediment data

• 56 sites throughout the Bay
• EPA Concentrations were quite low as compared
  to other bays and harbors near large metropolitan
  areas.
• Dominated by higher chlorinated congeners
• Many lower chlorinated congeners lt MDL

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Dioxin in Cormorant Eggs
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Proposed Dioxin Sampling Plan
Draft Data Do not cite or quote