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A <br /> `- Department of Toxic Substances Control <br /> v Edwin <br /> F. Lowry, Director <br /> Terry Tamminen 8800 Cal Center Drive Arnold Schwarzenegger <br /> Agency Secretary Sacramento, California 95826-3200 Govemor <br /> CaVEPA <br /> MCD <br /> April 1, 2004 <br /> APR 0 7 2004 <br /> ENVIRONMENT HEALTH <br /> Mr. Marshall Cloud PERMIT/SERVICES <br /> Remedial Project Manager <br /> Environmental Office <br /> Defense Distribution Depot—Tracy Site <br /> Post Office Box 960001 <br /> Stockton, California 95296-0250 <br /> COMMENTS ON DRAFT WELL MONITORING PROGRAM, 2003 ANNUAL <br /> MONITORING REPORT DATED DECEMBER 2003, DEFENSE DISTRIBUTION <br /> DEPOT (DDJC)-TRACY SITE, STOCKTON, CALIFORNIA <br /> Dear Mr. Cloud: <br /> The Department of Toxic Substances Control (DTSC), received the above-mentioned <br /> report on January 9, 2004. The report summarizes ground water analytical data from all <br /> wells sampled and water level measurements collected during the 2003 monthly and <br /> quarterly sampling events conducted from October 2002 through September 2003. In <br /> addition, the report presents conclusions drawn from those results and provides <br /> recommendations for sampling, analysis, or remediation. DTSC has reviewed the <br /> report and has the following comments: <br /> Comments: <br /> 1.) Results from the Soil Vapor Extraction systems at DDJC-Tracy site indicate that <br /> an additional round of extraction is necessary at Area 3 in order to reach the <br /> clean-up goals of 350 ppbv for Trichloroethene (TCE) and 780 ppbv for <br /> Tetrachloroethene (PCE). Currently, Area 3 has soil gas concentrations of TCE <br /> in excess of 1,300 ppbv and 2,500 ppbv for PCE. The SVE sites will be <br /> evaluated for closure once TCE and PCE soil vapor concentrations are at or <br /> below the cleanup standards set forth in the Record of Decision (ROD). <br /> 2.) Page ES-9, E.S.6.2.1: The biovent site at Solid Waste Management Unit 24 <br /> (Building 24) has concentrations of both Total Petroleum Hydrocarbon-Diesel <br /> (TPH-d) and Benzene, Toulene, Ethylbenzene, and Xylenes (BTEX) at 3,400 <br /> ppm and 10 ppm, respectively. These concentrations exceed the ROD cleanup <br /> ® Printed on Recycled Paper <br />