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PM09 Sediment Quality Assessment Cases
(PM151A) Polychlorinated Biphenyl (PCB) Trends Analysis at Hunters Point Shipyard, San Francisco, California, using PCB Congener Analysis.
Dauchy, J, Baker, J, Rose, L, Walden, M,
ABSTRACT- During August and September 2002, samples were collected to characterize the sediments of the Parcel E shoreline at Hunters Point Shipyard, San Francisco, California in an attempt to understand potential sources of contamination to the offshore area and evaluate risk to selected ecological receptors. Selected samples were analyzed for metals, pesticides, polychlorinated biphenyls (PCB), semivolatile organic compounds, dioxins and furans, tributyltins, and total petroleum hydrocarbons. The PCB data were used to evaluate trends in PCB distribution from onshore to offshore areas by way of the shoreline using PCB congener analysis. PCBs in South Basin appear to be related to PCB concentrations found within the landfill area. It appears that PCBs were dumped into the former channel from the east end of Palou Avenue storm sewer outfall to South Basin sometime from 1965 to 1969. These PCBs washed down into South Basin and were deposited along the shoreline adjacent to the landfill. The shoreline is accretional based on the U.S. Army Corps of Engineers sediment budget study for San Francisco Bay (Ogden Beeman & Associates, Inc., and Ray B. Krone & Associates, Inc. 1992) and the presence of silts and clays in the shoreline sediments. The sediments offshore are accretional at the rate of about 0.25 cm per year (Battelle, Entrix, Inc., and Neptune and Company 2002).
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