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Q; <br /> Department of Toxic Substances CF. trol <br /> v <br /> Maziar Movassaghi �/��� <br /> Linda S.Adams Acting Director D�Fald Schwarzenegger <br /> Secretary for8800 Cal Center Drive JE%/�f 1 2 Governor <br /> Environmental Protection Sacramento, California 95826-3200 ZOOy <br /> ENVIRONA4ENr <br /> PERMIT/SERVIEE3 rH <br /> June 11, 2009 <br /> Mr. Maurice Benson <br /> Defense Logistics Agency <br /> Defense D istribution Depot San Joaquin, Sharpe Site <br /> Post Office Box 960001 <br /> Stockton, California 95296-0250 <br /> COMMENTS ON GROUNDWATER EXTRACTION WELL INSTALLATION WORK <br /> PLAN FOR EXTRACTION WELL (EW) EWCC3R FOR DEFENSE DISTRIBUTION <br /> DEPOT SAN JOAQUIN CALIFORNIA (DDJC), SHARPE SITE, LATHROP, <br /> CALIFORNIA <br /> Dear Mr. Benson: <br /> The Department of Toxic Substances Control (DTSC) received e-mail notification that <br /> the above-mentioned work plan was available for electronic review on May 18, 2063. <br /> The work plan describes the planned well installation activities to replace a "damaged <br /> beyond repair" off-site extraction well EWCC3, responsible for hydraulic control of the <br /> trichloroethene (TCE) plume west of the Central Area of DDJC-Sharpe. EWCC3 failed <br /> in October 2008 due to a catastrophic motor failure causing damage to the motor <br /> housing and well casing. Subsequent redevelopment and repair activities were <br /> unsuccessful in "sleeving" the damaged portion of the casing and removing 25+ feet (') <br /> of fine grained sand and silt that entered the well during bailing and purging. In <br /> February 2009, EWCC3 was determined to be "damaged beyond repair" prompting <br /> immediate replacement by Defense Enterprise San Joaquin California. EWCC3R <br /> off-site well installation activities are planned for June 2009. <br /> DTSC has reviewed the work plan and has the following comments: <br /> ® Printed on Recycled Paper <br />