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Department of Toxic Substances Control <br /> Maureen F. Gorsen, Director <br /> Linda S.Adams 8800 Cal Center Drive Arnold Schwarzenegger <br /> Secretary for Sacramento, California 95826-3200 Governor <br /> Environmental Protection <br /> ULi; 2 4 2007 <br /> December 17, 2007 ENVIRONMENT HEALTK <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 WITH DRAFT OPERABLE UNIT 2 METALS REMEDIAL ACTION <br /> REPORT FOR SITE S-26, AREA 6, 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 /> report on November 1, 2007. The report presents the results of a soil excavation at Site <br /> S-26, located in North Balloon at DDJC-Sharpe to remove soil contaminated with lead <br /> and chromium exceeding the United States Environmental Protection Agency's <br /> industrial preliminary remediation goals. <br /> Soil excavation was conducted at site S-26 in order to meet the revised industrial <br /> cleanup goal of 800 milligrams per kilogram (mg/kg) for lead in accordance with the <br /> Operable Unit 2 Record of Decision. The removal action at Site S-26, Area 6, <br /> excavated contaminated soil and railroad ballast from an area of approximately 1,170 <br /> square feet to a depth of two feet below ground surface. Approximately 116 tons of soil <br /> and railroad ballast was removed and transported to licensed offsite waste disposal <br /> facilities. <br /> A total of nine confirmation samples were taken following excavation at Site S-26, and <br /> included a total of seven sidewall confirmation samples, and two floor confirmation <br /> samples. All soil confirmation sample results were less than the cleanup standards of <br /> 800 mg/kg total lead and 300 mg/kg total chromium. The nine confirmation samples <br /> were also analyzed for leachable lead and chromium using the California Waste <br /> Extraction Test with de-ionized water. Soluble lead and chromium concentrations were <br /> all non-detect using detection limits of 100 micrograms per litre (Ng/L) and 50 Ng/L, <br /> respectively. <br /> 0 Printed on Recycled Paper <br />