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Department of Toxic Substances Control <br /> Maureen F. Gorsen, Director <br /> Alan C. Lloyd, Ph.D. 8800 Cal Center Drive Ar old Schwarzenegger <br /> Agency Secretary Sacramento, California 95826-3200 Governor <br /> Cal/EPA rr II `'V// <br /> REC <br /> August 15, 2006 AUG �, 2 2006 <br /> ENVIRONb1ENT HEALTH <br /> PERMIT/SERVICES <br /> Mr. Marshall Cloud <br /> Defense Logistics Agency <br /> Defense Distribution Depot San Joaquin, Sharpe Site <br /> Post Office Box 960001 <br /> Stockton, California 95296-0250 <br /> CONCURRENCE ON THE DRAFT REMEDIAL ACTION WORK PLAN SITE S-26 <br /> AREA SIX, DATED AUGUST 4, 2006, FOR DEFENSE DISTRIBUTION DEPOT <br /> SAN JOAQUIN COUNTY (DDJC), SHARPE SITE, LATHROP, CALIFORNIA <br /> Dear Mr. Cloud: <br /> The Department of Toxic Substances Control (DTSC) received the above-mentioned <br /> work plan on August 7, 2006. The Site S-26 Area 6 Work Plan presents the design <br /> analysis, field procedures, and quality control procedures to be followed during the <br /> planned action in fall 2006 to remove lead and chromium-contaminated soil at <br /> Site S-26. <br /> Site History <br /> In 1996, Site S-26 characterization efforts by Radian International sampled soil to <br /> further define the excavation area and volume of remaining contaminated soil. The <br /> 1997 Design Analysis Report by Radian International for Site S-26 estimated that <br /> approximately 90 cubic yards of lead contaminated soil remains. During 1998, limit,-d <br /> soil removal actions were conducted at Site S-3 and five of the six Areas of Site S-26, <br /> but were not performed at Site S-26 Area 6 due to the prohibitive cost of removing And <br /> replacing the operational railroad tracks in the area, and also due to DI-WET resultE for <br /> lead and chromium soil samples showing no threat of impact to the ground water. <br />