Location: Stennis Space Center, MS
Bhate performed a Remedial Investigation (RI) associated with polychlorinated biphenyls (PCBs) and volatile organic compounds (VOCs) contamination in soils and groundwater. As a result of the RI, Bhate developed a corrective action plan (CAP) for remediation activities. Bhate provided quality control/project oversight for NASA during cleanup activities which included the excavation, removal, and incineration of 471 tons of PCB-contaminated soils. Bhate collected 108 soil samples and 12 groundwater samples from 40 soil borings for PCBs and VOCs analysis. Saturated PCB soils were encountered during concrete removal for a foundation system at Building 3216, when two 2-inch diameter electrical conduit lines were encountered by construction crews. Following discovery, soil samples were collected for PCB analysis. Results indicated that PCB levels were in the range 23,000 milligrams per kilogram (mg/kg) or 2.3% to 42,000 mg/kg or 4.2%. Construction activities were immediately halted by NASA until further investigation was completed. Bhate developed an approach to expedite site characterization for subsequent remediation in accordance with Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) and Toxic Substances Control Act (TSCA) regulations. Due to the compressed schedule and time-critical nature of the project, Bhate worked closely with Stennis, Mississippi Department of Environmental Quality (MDEQ) and the U.S. Environmental Protection Agency (USEPA) Region 4 for early input and buy-in on the investigation strategy.