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r <br /> J � <br /> San Joaquin County <br /> o *9.W!V '.� Environmental Health Department DIRECTOR <br /> Donna Heran, REHS <br /> _ 1868 East Hazelton Avenue <br /> Stockton, California 95205-6232 PROGRAM COORDINATORS <br /> Robert McClellon,REHS <br /> Jeff Carruesco,RENS, RDI <br /> C4��.....• �i�P Website: www.sjgov.org/ehd Kasey Foley,REHS <br /> F o R Phone: (209) 468-3420 Linda Turkatte, RENIS <br /> Fax: (209) 464-0138 <br /> November 15, 2012 <br /> Mr. Steve Azevedo <br /> West Clay Properties <br /> Post Office Box 61-52 . <br /> Stockton, California 95206 <br /> Subject: West Clay Properties <br /> 639 West Clay Street <br /> Stockton, California 95206 <br /> Dear Mr. Azevedo: <br /> By letter dated 05 April 2012, the San Joaquin County Environmental Health Department (EHD) <br /> had directed you to submit a feasibility study to this department within thirty days of the date of <br /> the letter for the `Underground Storage Tank No. 3' area (the Southeast petroleum hydrocarbon <br /> contaminant plume), comparing several remedial technologies as well as resource requirements <br /> of each technology for cost effectiveness. The EHD also directed that the report of findings <br /> following a twenty-four-week in-situ ozone sparge (IOS) pilot study approved by this agency by <br /> letter dated 17 April 2006, be submitted to the EHD and the California Regional Water Quality <br /> Control Board Central Valley Region (CRWQCBCVR). <br /> To date, neither the feasibility study nor the IOS pilot study report has been submitted to the <br /> EHD. Advanced Geo Environmental, Inc. (AGE), your consulting firm, continues to recommend <br /> the submittal of a work plan to inject ozone to remediate the `Underground storage Tank No. 3' <br /> area in the latest report, Groundwater Monitoring Report — Second Quarter 2012, dated 12 <br /> October 2012. Ozone injection is just one possible method to remediate the contaminated <br /> plume at this site. For AGE and the EHD to evaluate the best remedial method to clean up the <br /> petroleum hydrocarbon contamination at this site, a feasibility study is appropriate and <br /> necessary. <br /> The EHD now directs that you submit the feasibility study and provide the report or address the <br /> results from performing the twenty-four-week IOS pilot study to the EHD within fourteen days of <br /> the date of this letter. <br /> In the latest Five-year Review Summary Report dated May 2012, the State Water Resources <br /> Control Board Underground Storage Tank Cleanup Fund (CUF) recommended that the EHD <br /> direct the discontinuation of monitoring un-impacted monitoring wells and continue oxygen <br /> sparging to achieve water quality objectives in a timely manner. <br />