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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> Donna Heran,REHS <br /> '.qc <br /> 1868 East Hazelton Avenue PROGRAM COORDINATORS <br /> Stockton, California 95205-6232 Robert McClellon,REHS <br /> _ Jeff Carruesco,REHS,RDI <br /> Kasey• C; .,. �P • Website:www.s ov.or /ehd Linda Foley,REHS <br /> /9 9 Linda Turkatte,REHS <br /> q�iFORd Phone: (209)468-3420 <br /> Fax: (209)464-0138 <br /> October 9, 2012 <br /> Ms. Catherine Kahler Mr. George Betker <br /> J.M. Equipment Company, Inc. Geo Properties, Inc. <br /> 321 Spreckles Avenue 2306 Jackie Court <br /> Manteca, California 95336 Oakdale, California 95361 <br /> Subject: Former J.M. Equipment Company LOP Case No.: 9401 <br /> 1245 West Charter Way CUF No.:12607 <br /> Stockton, California 95206 GeoTracker ID No.: T0607700794 <br /> Dear Ms. Kahler and Mr. Betker: <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> First Semi-annual Groundwater Monitoring & Remedial Effectiveness— Second Quarter 2012 <br /> (report), dated 29 June 2012, prepared by your consulting firm, Geological Technics, Inc. <br /> (GTI), on your behalf for the above-referenced site. By letter dated 24 June 2011, the EHD <br /> had approved a one-year feasibility study to assess the effectiveness of three oxygen- <br /> releasing remedial technologies. <br /> In the report, GTI presented results from completing three-quarters of the one-year feasibility <br /> study begun in September 2011. During this time, GTI compared oxygen release compound <br /> (ORC) Advanced socks, air sparging (AS), and hydrogen peroxide injections and concluded <br /> that hydrogen peroxide injection was the best remedial technology to increase oxygen <br /> concentrations and decrease the petroleum hydrocarbon concentrations in groundwater at this <br /> site. Based on these results, GTI has recommended submitting a Corrective Action Plan <br /> (CAP) that includes a proposal to expand the area of the hydrogen peroxide injection system <br /> while continuing the air sparging test to better assess this remedial technology. <br /> To this end, GTI has proposed installing ten additional hydrogen peroxide injection wells and <br /> three additional monitoring wells at locations illustrated on Figure 4 of the report. GTI noted <br /> that if site conditions limited the injection of hydrogen peroxide at specific wells, air sparging <br /> would be implemented using the site's existing air compressor. <br /> The EHD approves the proposed submittal of a CAP that includes the expansion of hydrogen <br /> peroxide injection system, pending approval from the California Regional Water Quality <br /> Control Board Central Valley Region of Notice of Intent to comply with the terms of General <br /> Waste Discharge Requirements, and the Monitoring and Reporting Program No. R5-2008- <br /> 0149-010. Submit the CAP to the EHD by 14 December 2012 and include the technical <br /> justification for each proposed well. <br />