Laserfiche WebLink
Department of Toxic Substances Control <br /> Maureen F. Gorsen, Director <br /> Linda S.Adams 8800 Cal Center Drive Arnold Schwarzenegger <br /> Agency Secretary Sacramento, California 95826-3200 Governor <br /> Cal/EPA <br /> REC EV D <br /> DEC 1. 2 2006 <br /> December 6, 2006 <br /> ENIRONENT PERMITH <br /> ISERVICES <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 SITE P-5A INVESTIGATION RESULTS TECHNICAL <br /> MEMORANDUM, FOR DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN COUNTY <br /> (DDJC), SHARPE SITE, LATHROP, CALIFORNIA <br /> Dear Mr. Cloud: <br /> The Department of Toxic Substances Control (DTSC) received the above-mentioned <br /> technical memorandum on November 2, 2006. The memorandum discusses the soil <br /> gas and ground water field investigations performed at DDJC-Sharpe to determine <br /> whether former Site P-5A is a continuing source of volatile organic compound <br /> contamination to ground water. <br /> Site P-5A is located at the northern edge of a former runway in the Central Area near <br /> monitoring well (MW) MW437. The Site is located in the area of the former runway <br /> ponds identified as Solid Waste Management Unit #34 that were used to dispose of <br /> paint stripper sludge generated at Building 380. In 1997, fieldwork at Site P-5A showed <br /> soil gas levels below the cleanup level of 350 parts per billion volume (ppbv). Ground <br /> water samples showed Trichloroethene (TCE) concentrations ranging from non-detect <br /> to 340 pg/L. No-Further Action was recommended at the Site. <br /> The Site P-5A fieldwork included a total of 24 discrete soil vapor samples and 12 <br /> discrete shallow ground water samples collected by Cone Penetrometer Test (CPT) <br /> methods. Three CPT pushes were completed for each sampling location to collect <br /> lithologic data, soil gas samples, and ground water samples. The initial borehole was <br /> performed to collect lithologic information of the localized geology. The logs created by <br /> the CPT work were then used to select the soil vapor and ground water sampling <br /> depths in the highest permeability vadose zone and saturated zone lithologies, <br />