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Fig. 1. Savannah River Site (SRS) and study site location map. The SRS lies in the upper Atlantic Coastal Plain along the Savannah River in South Carolina. Past discharges of process wastewater to Tims Branch resulted in extensive contamination of sediments downstream from the M-Area sewer outfall, including sediments within the Steed Pond basin. Sediment sampling locations for Steed Pond (SP) and uncontaminated reference sites, that is, upper Tims Branch (TB00) and Boggy Gut (BG), are indicated on the SRS map and M-Area inset.