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Department of Toxic Substances Control <br /> vMaureen F. Gorsen, Director <br /> 8800 Cal Center Drive Arnold Schwarzenegger <br /> Linda S.Adams Sacramento, California 95826-3200 Governor <br /> Agency Secretary � l;;�'� <br /> Cy Secy nEC� VII}II II <br /> w NOV 4 20001-88 <br /> November 3, 2008 <br /> ENVIRONMENT HEALTH_ <br /> 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 THE WAREHOUSE 10 INVESTIGATION REPORT FOR DEFENSE <br /> DISTRIBUTION DEPOT SAN JOAQUIN COUNTY (DDJC), TRACY SITE, TRACY, <br /> CALIFORNIA <br /> Dear Mr. Benson: <br /> The Department of Toxic Substances Control (DTSC) received the above-mentioned <br /> report on September 12, 2008, submitted on behalf of Defense Enterprise Support <br /> San Joaquin California (DESJC). The report summarizes both the historical and recent <br /> investigations at Warehouse 10, with focused discussions on results from the <br /> Department of the Army Corps of Engineers (ALOE) April 2008 fieldwork at <br /> Warehouse 10. <br /> Warehouse 10 is the site of a former aboveground solvent tank, otherwise known as <br /> Solid Waste Management Unit (SWMU) 20. The area around the tank contained a floor <br /> drain and a former paint spray booth, both connected to the industrial waste pipelines <br /> designated as SWMU 33. Remedial Investigations at Warehouse 10 in 1996 detected a <br /> variety of volatile organic compounds (VOCs) and semivolatile organic compounds in <br /> samples of sludges from the floor drain, sumps, and soil samples resulting in three <br /> separate soil removal actions taken in September 1997, July 1998, and June 1999. <br /> The April 2008 ACOE Warehouse 10 Investigation performed 15 soil borings with 14 <br /> additional step-out locations at depths ranging from 4.5 to 19 feet below ground surface <br /> (bgs). Three discrete soil and soil vapor samples were taken at each boring location <br /> with groundwater samples taken at the bottom of each boring at depths ranging from <br /> 23 to 30 feet bgs. <br />