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..moi <br /> 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, Califonial 995826��--32I f0�\0�//]I_Lr�� <br /> 1 I1 LACE U IS LD <br /> DEC 1 6 2009 <br /> December 15, 2009 <br /> ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Mr. Maurice Benson <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 ENHANCED REDUCTIVE DECHLORINATION <br /> TECHNOLOGY EMULSIFIED OIL PILOT STUDY REPORT FOR DEFENSE <br /> DISTRIBUTION DEPOT SAN JOAQUIN CALIFORNIA (DDJC), SHARPE SITE, <br /> 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). The report review schedule <br /> affords the regulatory agencies a 60-day review. <br /> The report provides the results of a pilot study conducted in the North Balloon area at <br /> DDJC-Sharpe. The pilot study injected emulsified oil substrate (EOS) into the saturated <br /> subsurface in an effort to remediate remaining trichloroethene (TCE) mass responsible <br /> for persistent groundwater plumes. <br /> The first goal of the pilot study was to evaluate the effectiveness of the emulsified oil in <br /> the enhancement of reductive dechlorination of TCE in groundwater at DDJC-Sharpe. <br /> The second objective of the pilot study was to analyze the use of the injection wells with <br /> short screen intervals for introducing and distributing the EOS into both coarse and fine- <br /> grained soils. Lastly, the final goal of the pilot study was to gather information on the <br /> rate of TCE destruction, breakdown, radius of influence (ROI) of EOS injection, and <br /> longevity of the EOS amendment in the sub-surface environment. <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 /> 9 Printed on Recycled Paper <br />