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Department of Toxic Substances Control <br /> Maziar Movassaghi <br /> Linda S.Adams Acting Director Arnold Schwarzenegger <br /> Secretary for 8800 Cal Center Drive Governor <br /> Environmental Protection Sacramento, California 995((882�26-32(00 <br /> December 15, 2009 <br /> DEC 1 6 2009 <br /> ENVIRONMENT HEALTH <br /> Mr. Maurice Benson PERMIT/SERVICES <br /> Remedial Project Manager <br /> Defense Distribution Depot—Tracy Site <br /> P.O. Box 960001 <br /> Stockton, California 95296-0320 <br /> COMMENTS ON THE DRAFT POTASSIUM PERMANGANATE PILOT STUDY <br /> RESULTS REPORT FOR DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN <br /> CALIFORNIA (DDJC), SHARPE SITE, LATHROP, CALIFORNIA <br /> Dear Mr. Benson: <br /> The Department of Toxic Substances Control (DTSC) received the above-mentioned <br /> report on August 24, 2009, submitted by the URS Corporation on behalf of Defense <br /> Enterprises Support San Joaquin California (DESJC). <br /> The report provides the results of a pilot study at DDJC-Sharpe that used hydraulic <br /> fracturing in the South Balloon area to inject potassium permanganate into the saturated <br /> soil in an effort to remediate trichloroethene (TCE) contamination in the groundwater. <br /> The results of the study will be used to develop an engineering evaluation/cost analysis <br /> of non-pump and treat alternatives for contaminant removal. <br /> Background <br /> In an attempt to remediate contaminant mass contributing to groundwater contamination <br /> at DDJC-Sharpe, DESJC implemented a chemical oxidative In-Situ technology based <br /> on recommendations in the Treatment Technology Investigation Results Technical <br /> Memorandum. The pilot study location was selected based on groundwater sampling <br /> results conducted as part of cone penetrometer (CPT) investigations in 2006, 2007, and <br /> 2008. The CPT-investigation detected TCE concentrations as high as 1,600 pg/L in <br /> both fine grained and coarse deposits of the saturated zone. The TCE mass in the <br /> South Balloon area exists both north and south/southeast of Building 649 and has been <br /> recorded at depths between 40 and 75 feet below ground surface. DTSC has reviewed <br /> the work plan and has the following comments: <br /> ® Printed on Recycled Paper <br />