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San Joaquin County <br /> oP° Environmental Health Department DIRECTOR <br /> " Donna Heran,REHS <br /> 600 East MainStreet <br /> Stockton, California 95202-3029 PRO Robeert rt M McClellonRCOORDINATORS <br /> REHS EHS RS <br /> .� _ R• <br /> . . .. <br /> - Jeff Carruesco, REHS,RDI <br /> c p Kasey Foley, REHS <br /> Website: www.sjgov.org/ehd Linda Turkatte, REHS <br /> Phone: (209)468-3420 <br /> Fax: (209)464=0138 <br /> :November 10, 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 Ms. Ueda: <br /> The San Joaquin County Environmental Health Department (EHD) was notified by your <br /> consulting firm, Advanced GeoEnvironmental, Inc. (AGE), by electronic mail on 03 October <br /> 2011, that the State Water Resources Control Board (SWRCB) Cleanup Fund (CUF) has <br /> allocated $10,000.00 for your site for the 2011/2012 fiscal year. AGE noted that the funding <br /> will only be enough to perform two semi-annual groundwater-sampling events during the <br /> fiscal year, or to perform a human health risk assessment, a vapor intrusion evaluation, and <br /> collect groundwater samples from wells within 1,000 feet. of your site. By letter dated 30 <br /> August 2011, the EHD had approved a work plan for an ozone injection feasibility pilot study <br /> that included the installation of four ozone injection wells, and had directed: <br /> • Ozone injection wells be installed upon meeting the Central Valley Regional Water <br /> Quality Control Board requirements for a waste discharge requirement (WDR) <br /> permit; <br /> • A human health risk.assessment be performed; <br /> • The potential risk from vapor intrusion be evaluated; <br /> • Groundwater samples be collected for analysis of chemicals of concern from wells <br /> located within approximately 1,000 feet of this site; and <br /> • An estimate of the time required for groundwater to achieve water quality objectives <br /> be submitted. <br /> AGE has requested clarification concerning the directives listed above considering the <br /> limited reimbursement expenses allowed to this site for this fiscal year. <br /> In light of this information from AGE and the CUF's recommendation for site closure <br /> consideration, the EHD directs the you proceed with the human health risk assessment, the <br /> vapor intrusion risk evaluation, the collection of groundwater samples from down-gradient <br /> water supply wells within approximately 1,000 feet of this site, and.providing the estimate for <br /> when water quality objectives will be achieved as explained by letter dated 30 August 2011 <br /> from this department. The EHD also approves a reduction in the sampling of the monitoring <br /> wells. <br />