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(230) Magnitude and Distribution of PCBs in Ecological Receptors.
Gendusa, T*,1, French, R1, 1 Camp Dresser & McKee, Inc., Huson, MT
ABSTRACT- PCBs are found in surface water, sediment, soil, and all sampled biota associated with the Kalamazoo River. The ERA performed for this site relies on extensive sampling of representative ecological receptors to estimate risk and determine media-specific preliminary remediation goals (PRGs). Sampled media include surface water (SW), instream sediment (SED), floodplain sediment (FPSED), surface soil (SS), terrestrial plants, carp, sucker, smallmouth bass, earthworm, deer/white-footed mouse, muskrat, mink, and eggs of eight bird species. Relationships among water, fish, and instream sediments are described using site-specific bioaccumulation factors (BAFs) and biota-sediment accumulation factors (BSAFs) based on co-located samples. Dietary no observed adverse effects concentrations (NOAECs) and lowest observed adverse effects concentrations (LOAECs) for reproductive effects in mink were used to derive NOAEL- and LOAEL-based PRGs for SED. SED PRGs range from 0.13 - 0.7 mg total PCBs/kg. Whole body fish limits are the same as those derived for SED because the average site-wide BSAF for three species of is 1.02. Food chain modeling is used to derive preliminary terrestrial PRGs based on PCB contamination of surface soils. These terrestrial PRGs may be re-evaluated as newly acquired data for key terrestrial food web components (e.g., passerine birds, shrews, invertebrates) become available. PRGs will provide risk managers with media-specific total PCB concentrations ranging from safe (NOAEL-based) to potentially unacceptable (LOAEL-based) levels for sensitive receptors utilizing the Kalamazoo River environment.
Key words: PCBs, ERA, sediment, PRGs
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