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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> 1868 East Hazelton Avenue Donna Heran,REHS <br /> Stockton, California 95205-6232 PROGRAM COORDINATORS <br /> Robert Mcaellon,REHS <br /> Jeff Carruesoo,REHS,RDI <br /> Website: www.sjgov.org/ehdKasey REHS <br /> Phone: (209)468-3420 Linda Turlkatte,REHS <br /> Fax: (209) 464.0138 <br /> September 10, 2012 <br /> KEN GILLIES <br /> GILLIES TRUCKING <br /> P O BOX 8303 <br /> STOCKTON CA 95208 <br /> RE: Gillies Trucking SITE CODE: 1703 <br /> 3931 Newton Road <br /> Stockton, CA 95205 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Soil <br /> Vapor Extraction Pilot Test Report, prepared on your behave by your consultant, <br /> Stephen G. Muir Consulting Geologist and Geophysicist, dated December 2011, and <br /> has the following comments. <br /> After 7 soil vapor extraction (SVE)wells were installed in the on-site source area, a soil <br /> vapor extraction test was performed from May 31, 2011, through June 8, 2011. During <br /> the test, 8 wells were utilized; 4 SVE wells in a shallow zone and 3 SVE wells along with <br /> one monitoring well in a deeper zone. During the test the shallow zone wells and the <br /> deep zone wells were isolated and tested independently. The shallow zone mass <br /> removed was estimate at 6.5 pounds tol5.8 pounds per day and the deep zone mass of <br /> contaminate removal estimate was 1 pound to 24.5 pounds per day with a 50-foot radius <br /> of influence. The contaminant mass estimates were a combination of gasoline and <br /> diesel fuel constituents removed from the vadose zone. <br /> With the estimated rate of contaminant removal and a 50-foot radius of vacuum <br /> influence established in the pilot test, it appears that SVE is a viable remediation <br /> technology for contaminant removal in the shallow and deep vadose zones. The SVE <br /> technology alone does not affectively remove contaminants from ground water. No <br /> ground water remediation testing was performed, but in-situ air sparging in the saturated <br /> zone in conjunction with SVE should be considered to enhance cleanup of <br /> contamination in the source area. <br /> Utilizing the data collected during the pilot test, please complete a remediation feasibility <br /> study which should include a remedial action plan to perform interim remediation on-site. <br />