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�..� %WWI <br /> San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> Donna Heran,REHS <br /> z 600 East Main Street <br /> PROGRAM COORDINATORS <br /> Stockton, California 95202-3029 PRobertMcClellon,REHS <br /> •' �_' Jeff Carruesco, REHS, RDI <br /> Website: www.sjgov.org/ehd Kasey Foley,REHS <br /> �/FOR <br /> Phone: (209)468-3420 <br /> Fax: (209) 464-0138 <br /> April 15, 2010 <br /> Mr. Den and Ms. Betty Ueda Mr. James Ueda, Program Director II <br /> 626 East Galin Road State of California Department of General Services <br /> French Camp, California 95231 Professional Services Branch <br /> Seismic and Special Programs Section <br /> 707 3rd Street, Suite 4-330 <br /> West Sacramento, California 95605 <br /> Subject: Den's Auto Repair <br /> 308 South EI Dorado Street <br /> Stockton, California 95203-3404 <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Groundwater Monitoring Report— First Quarter 2090 (report), dated March 4, 2010, prepared <br /> and submitted by Advanced GeoEnvironmental, Inc. (AGE) on your behalf for the above- <br /> referenced site. In the report, AGE addresses questions and directives from the EHD <br /> concerning the ozone injection bench scale pilot study. By letter dated April 1, 2009, the EHD <br /> had requested additional information after reviewing the proposed Ozone Injection — Bench <br /> Scale Pilot Study submitted by AGE in Appendix B of Ozone Injection Feasibility Study and <br /> Bench-Scale Work Plan, dated January 30, 2009. <br /> In the report, AGE clarifies the manner in which the soil samples will be collected from borings <br /> OZ1 and OZ2, composited, and combined with groundwater collected from MW-1A and <br /> MW-113; and AGE has added the soil and groundwater analyses requested by the EHD to <br /> identify adverse effects to water quality by ozone injection. Based on this information, the <br /> EHD approves the ozone injection bench-scale pilot study. As stated by letter dated April 1, <br /> 2009, the EHD can not respond to the ozone injection feasibility pilot study submitted by AGE <br /> until results from the bench-scale test have been submitted and reviewed; and a comparison <br /> of the proposed ozone injection remedial method to several other potential remedial methods <br /> to determine the most cost-effective for removing petroleum hydrocarbon contaminants based <br /> on site specific data and cost effectiveness has been provided to the EHD for review. <br /> Please submit a boring permit application and inspection fee of $434 to the EHD and <br /> complete the advancement of the two on-site soil borings and the bench-scale test by June <br /> 30, 2010. Notify the EHD of pending fieldwork at least a week prior to the scheduled date. <br />