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Department of Toxic Substances Cont , - W. <br /> ��� SAY 23 PM I <br /> Maureen F. Gorsen, Director SATIN JU'10UIN COU( <br /> Dan Skopec 8800 Cal Center Drive ENVIR0NMEWT)LAl5chwarzenegger <br /> Acting Secretary Sacramento, California 95826-3200 HEALTFIDEPARTMD6,Ternor <br /> Cal/EPA <br /> May 17, 2006 <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 TREATMENT TECHNOLOGY INVESTIGATION <br /> RESULTS TECHNICAL MEMORANDUM, FOR DEFENSE DISTRIBUTION DEPOT <br /> 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 March 27, 2006. The technical memorandum discusses the results of the <br /> analyses of soil and ground water samples collected to help support the selection of <br /> possible ground water volatile organic compound alternative treatment technology pilot <br /> studies at DDJC-Sharpe. <br /> DDJC-Sharpe is proposing an emulsified oil injection pilot study for the Trichloroethene <br /> (TCE) plume in the North Balloon near monitoring well (MW) MW456. Emulsified oil <br /> was selected as the treatment technology in the North Balloon due to evidence of <br /> microbial degradation and the limiting carbon and hydrogen sources for biotic natural <br /> degradation. <br /> The second treatment technology pilot study proposed at DDJC-Sharpe is in-situ <br /> chemical oxidation using potassium permanganate in the South Balloon. In-situ <br /> chemical oxidation in the South Balloon is proposed for the area surrounding MW418. <br /> The South Balloon was selected over the Central Area because the TCE contamination <br /> is shallower and the pilot study drilling costs would be less for treating a shallower area. <br /> Additionally, the South Balloon hotspot is farther from the site boundary and has more <br /> down gradient monitoring wells than the Central Area allowing added performance <br /> monitoring of the chemical oxidant. <br /> I$ Printed on Recycled Paper <br />