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Screening Level Risk Assessment for Polychlorinated Biphenyls at the Hanford Site

Client: U.S. Department of Energy
Location: Richland, Washington

Challenge. Assess potential health risks from polychlorinated biphenyls (PCBs) in soils in the vicinity of Waste Management Area C.

Project-PCB-Risk-Assess-HanfordSolution. INTERA used PCB congener analytical results and the U.S. Environmental Protection Agency’s Toxicity Equivalency Factors methodology to calculate a total 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) toxicity equivalent to evaluate the potential health risks associated PCBs in soils. Results of total 2,3,7,8-TCDD toxicity equivalent for each of the shallowest samples collected were found to be many times lower than the published Revised Code of Washington 70.105D, “Hazardous Waste Cleanup — Model Toxics Control Act” value of 0.5 mg/kg. Based on our review of these PCB congener analytical results, sampling and analysis plans for a Phase 2 RCRA Facility Investigation were reevaluated and a recommendation was made to eliminate analysis of PCB congeners in further sampling activities.

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Services (Subservices):
Environmental (Human Health and Ecological Risk Assessment)
Sectors: Government