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�./ Sa/ <br /> San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> Donna Heran,REHS <br /> 600 East Main Street <br /> PROGRAM COORDINATORS <br /> �: =< Stockton, California 95202-3029 <br /> Robert McClellon,RENS <br /> .• '• Jeff Carruesco,REHS,RDI <br /> ' REHS,'�• <br /> 0... FOR�;P Website: www.sjgov.org/ehd Linda Kasey Foley, <br /> Turkate,REHS <br /> Phone: (209) 468-3420 <br /> Fax: (209) 464-0138 <br /> August 30, 2011 <br /> Mr. Den and Ms. Betty Ueda <br /> 626 East Galin Road <br /> French Camp, California 95231 <br /> Subject: Den's Auto Repair <br /> 308 South El Dorado Street <br /> Stockton, California 95203-3404 <br /> Dear Mr. and Mrs. Ueda: <br /> The San Joaquin County Environmental Health Department (EHD) has received and <br /> reviewed Corrective Action Plan (CAP), dated 15 June 2011, prepared and submitted by <br /> Advanced GeoEnvironmental, Inc. (AGE) on your behalf for the above-referenced subject <br /> site. By letter dated 18 February 2011, the EHD had concurred with the recommendation by <br /> AGE to submit a CAP that would present a comparison of groundwater and soil remedial <br /> methods to determine the most cost effective technology to mitigate the petroleum <br /> hydrocarbon contaminants at this site. <br /> In the CAP, AGE compared two soil remedial alternatives, ex-situ treatment and soil vapor <br /> extraction; and two groundwater remedial alternatives, groundwater extraction and in-situ <br /> chemical oxidation by in-situ ozone sparging (IOS). Based on the "significant reduction in <br /> petroleum hydrocarbon concentrations in groundwater and soil' reported from the ozone <br /> bench-scale test, AGE concluded that ozone injection was a feasible remedial method and <br /> recommended that the AGE-prepared Ozone Injection Feasibility Study and Bench Scale <br /> Work Plan (work plan), dated 30 January 2009, be implemented immediately. <br /> The EHD approves the work plan for the ozone injection feasibility pilot study involving <br /> approximately 24 weeks (six months) of ozone injection; however, if you have not already <br /> done so, prior to implementing the pilot study, submit the report of findings from the ozone <br /> bench scale test to the Central Valley Regional Water Quality Control Board (CVRWQCB) <br /> for their evaluation in regard to the necessity for a waste discharge requirement (WDR) <br /> permit. <br /> AGE proposes to install four ozone injection wells, OZ-1 through OZ-4, at locations <br /> illustrated on Figure 2 of the work plan while collecting soil samples at five-foot intervals for <br /> lithologic evaluation during the advancement of the boreholes to total depth of approximately <br /> 60 feet below surface grade (bsg). AGE proposes to install a 30-inch microporous sparge <br /> point between approximately fifty-seven and sixty feet bsg in each of the four injection wells <br />