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` ' Department of Toxic Substances Control <br /> vMaziar Movassaghi �` <br /> Linda S.Adams Acting Director <br /> Agency Secretary 8800 Cal Center Drive Arnold Schwarzenegger <br /> Cal/EPA (�p EuGifornia 95826-3200 Governor <br /> tl IIAUl14 2009 <br /> ENVIRONMENT HEALTH <br /> August 12, 2009 PERMIT/SERVICES <br /> Mr. Maurice Benson <br /> Defense Logistics Agency <br /> Defense Distribution Depot San Joaquin, Tracy Site <br /> Post Office Box 960001 <br /> Stockton, California 95296-0250 <br /> COMMENTS ON SOLID WASTE MANAGEMENT UNIT (SWMU) 20 FEASIBILITY <br /> STUDY FOR DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN CALIFORNIA <br /> (DDJC), TRACY SITE, TRACY, CALIFORNIA <br /> Dear Mr. Benson: <br /> The Department of Toxic Substances Control (DTSC) received a hard copy of the <br /> above-mentioned report on June 8, 2009, submitted on behalf of Defense Enterprise <br /> Support San Joaquin California (DESJC). The feasibility study presents: the nature and <br /> extent of soil contamination remaining at SWMU 20; general response actions; <br /> develops remedial alternatives to address the contamination, recommends soil vapor <br /> extraction (SVE), enhanced with pneumatic fracturing as the preferred remedial <br /> alternative to best achieve the remedial action objectives. <br /> DESJC previously submitted a Warehouse 10 Investigation Report received by DTSC <br /> on September 12, 2008. The report summarized the historical and more recent <br /> investigations at Warehouse 10, with focused discussions on results from the Army <br /> Corps of Engineers April 2008 fieldwork taken beneath Warehouse 10. The regulatory <br /> agencies rejected the Warehouse 10 Investigation Report because it recommended a <br /> preferred remedial alternative without following the proper remedy selection process in <br /> accordance with the National Contingency Plan and Comprehensive Environmental <br /> Response, Compensation, and Liability Act. Subsequent regulatory correspondence <br /> and meetings with DESJC identified the necessary criteria for the successful selection <br /> and approval of the preferred remedial alternative(s). <br />