Laserfiche WebLink
`- Department of Toxic Substances Control <br /> v Maureen F. Gorsen, Director <br /> Linda S.Adams 8800 Cal Center Drive <br /> Secretary for Sacramento, California 95826-3200 Arnold Schwarzenegger <br /> Environmental Protection <br /> Governor <br /> REC,um <br /> SEP 2. R 2007 <br /> September 18, 2007 <br /> SAN JOAQUIN COUNTY <br /> Mr. Marshall Cloud <br /> ENVIRONMENIAL HEALTH DEPT. <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 FOCUSED GROUNDWATER EXTRACTION TEST <br /> SUMMARY REPORT, FOR DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN <br /> COUNTY (DDJC), SHARPE SITE, LATHROP, CALIFORNIA <br /> Dear Mr. Cloud: <br /> The Department of Toxic Substances Control (DTSC) received the above-mentioned <br /> report on September 6, 2007. The summary report discusses the ongoing optimization <br /> efforts at DDJC-Sharpe using focused groundwater extraction to accelerate the mass <br /> removal of volatile organic compounds (VOCs) in DDJC-Sharpe onsite groundwater in <br /> the vicinity of monitoring wells (MWs) MW418C and MW437C, located in the North <br /> Balloon and Central Area, respectively. <br /> Monitoring wells MW418C and MW437C were selected for modification to become <br /> temporary extraction wells due to the historically higher concentrations of contaminants <br /> found in these wells in comparison to other DDJC-Sharpe monitoring wells. The <br /> contaminant concentrations found in MW418C and MW437C were also greater than <br /> those found in nearby extraction wells (EWs) EWC3 and EWCC1, making the MWs <br /> candidates for focused groundwater extraction. <br /> The focused groundwater extraction testing for both wells began in March 2005 and <br /> lasted until the third quarter of 2007 for MW418C and finished at MW437C in <br /> March 2007. <br /> DTSC has reviewed the subject report and has the following comments: <br /> 9 Printed on Recycled Paper <br />