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Charleston Naval Complex Zone J Ecological Risk Assessment Area of Concern 721 Updates

11-October-2005. EnSafe, Inc.. History. Zone J Water BodiesNoisette CreekCooper RiverShipyard CreekScreening Level Ecological Risk Assessments completed for each Water Body Sediment locations identified in Cooper River, Shipyard Creek and Noisette Creek that exceeded ecological risk criteria

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Charleston Naval Complex Zone J Ecological Risk Assessment Area of Concern 721 Updates

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    1. 11-October-2005 EnSafe, Inc. Charleston Naval Complex Zone J Ecological Risk Assessment & Area of Concern 721 Updates

    2. 11-October-2005 EnSafe, Inc. History Zone J Water Bodies Noisette Creek Cooper River Shipyard Creek Screening Level Ecological Risk Assessments completed for each Water Body – Sediment locations identified in Cooper River, Shipyard Creek and Noisette Creek that exceeded ecological risk criteria Navy decided to re-sample selected sediment sample locations with high risk numbers to confirm presence of contamination. Original evaluation was calculated from late 1990s data. Area of Concern 721 RFI AOC 721 borders Noisette Creek in Zone C Soil and groundwater investigative activities for the RFI completed. During risk assessment evaluation surface soil locations were identified that exceeded risk. Arsenic main contaminant of concern. Interim Measure Work Plan was submitted and approval was given by regulatory agencies to complete removal action.

    3. 11-October-2005 EnSafe, Inc. ZONE J PATH FORWARD Zone J Sampling and Analysis Plan – Spectra Tech 15 sediment sample locations will be sampled and analyzed to compile the necessary data (inorganics, SVOCs, pesticides, and PCBs). Five confirmatory samples/10 baseline sediment samples within the ebb and flow tide cycle. 10 non-CNC related sediments - Baseline condition of sediment within the Cooper River. Useful in risk management as a tool for evaluating the degree of contamination adjacent to CNC as compared to other areas not impacted heavily by CNC operations. Plan Approval – Received SCDHEC comments. Navy/Spectra Tech responded Once approved – 2 week mobilization 2 weeks after receiving analytical data – Final Report from Spectra Tech Data sent to EnSafe to recalculate ERM quotients . Decision Point to determine if ERA is completed.

    4. 11-October-2005 EnSafe, Inc. AOC 721 PATH FORWARD AOC 721 Removal Plan Plan – Spectra Tech Removal and offsite disposal of contaminated soil within the removal area excavated from a depth no greater than 1.5 feet bgs or upon encountering groundwater. A total estimated volume of 50 cubic yards will be excavated. Four confirmatory soil samples from the excavation floor collected after excavation is complete, and before placement of fill and final grading. Site Restoration Area will be backfilled and compacted to achieve grade suitable to allow surface drainage. Site Closure Report Project removal/closure activities Management of wastes Pertinent waste disposal documentation (manifests, bills of lading, shipping records, etc.) AOC 721 RFI Report – will be finalized to incorporate findings from removal activities.

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