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Mr. Maurice Benson <br /> November 3, 2008 <br /> Page 3 <br /> in the conclusion section of the report, the Warehouse 10 site will need to go <br /> through the proper remedy selection process, including the Baseline Risk <br /> Assessment and Feasibility Study using nine evaluation criteria of the <br /> National Contingency Plan (NCP). The remedy selection process should <br /> analyze the relative performance of proposed remedial alternatives, and <br /> compare the alternatives to the protection of human health, the environment, <br /> and comply with the Applicable or Relevant and Appropriate Requirements in <br /> accordance with the Comprehensive Environmental Response, <br /> Compensation, and Liability Act. <br /> Recommendations: <br /> 1. DTSC recommends that DESJC evaluate the TCE concentrations in <br /> unsaturated soil through conducting a baseline risk assessment to identify the <br /> level of risk to human health and the environment and propose additional <br /> fieldwork efforts, perhaps with soil vapor extraction to remediate the <br /> persistent source for groundwater contamination. <br /> 2. The remedial pathway forward for Warehouse 10 site must follow the <br /> applicable NCP remedy selection evaluation and reporting requirements prior <br /> to State approval and signature on an Amendment to Record of Decision. <br /> If you have any questions or comments regarding this letter, please feel free to contact <br /> me at (916) 255-3713 or e-mail me at pmacnich(c)dtsc ca.gov. <br /> Sincerely, <br /> At'e <br /> Peter MacNicholl, P.E. <br /> Hazardous Substances Engineer <br /> Sacramento Office <br /> Brownfields and Environmental Restoration Program <br /> cc: Mr. Mike Thomas <br /> URS Corporation <br /> Crown Corporate Center <br /> 2870 Gateway Oaks Drive, Suite 300 <br /> Sacramento, California 95833 <br />