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Department of Toxic_Substances Control <br /> Maureen F. Gorsen, Director <br /> Linda S.Adams 8800 Cal Center Drive Arno of Schwarzene er <br /> Secretary for 89 <br /> Environmental Protection Sacramento, California 95826-3200 Governor <br /> G <br /> March 19, 2007 MAP 7 2007 <br /> ENVIRONIvIr;Vf f{�A��H <br /> PERPA!i/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 /> COMMENTS ON THE DRAFT CONE PENETROMETER TEST (CPT) <br /> GROUNDWATER INVESTIGATION WORK PLAN, FOR DEFENSE DISTRIBUTION <br /> DEPOT 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 February 26, 2007. The work plan discusses the groundwater <br /> investigation at DDJC-Sharpe planned to delineate Trichloroethene (TCE) <br /> contamination in groundwater exceeding the detection limits in the C-zone aquifer <br /> beneath the off-depot area west of the Central Area and North Balloon. <br /> The proposed field work includes 12 CPT sampling locations planned to collect <br /> groundwater samples specifically from sand intervals within the C-zone aquifer. The <br /> C-zone aquifer was selected to better define the potentiometric surface due to the <br /> recent analytical results taken from monitoring well (MW) MW526CD and MW528CD. <br /> MW526 and MW528 monitoring data is showing the offsite TCE plume moving both <br /> down-gradient and northerly from extraction well (EW) EWCC3. <br /> DTSC has reviewed the work plan and has the following comments: <br /> Specific Comments <br /> 1.) Page iii, Abbreviations and Acronyms; Please include detection limit (DL) i <br /> the table. <br /> 9 Printed on Recycled Paper <br />