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San Joaquin County <br /> . Environmental Health Department DIRECTOR <br /> OG Linda Turkatte,REHS <br /> 1868 East Hazelton Avenue PROGRAM COORDINATORS <br /> Stockton, California 95205-6232 <br /> m ( Illy < Robert McClellon,REHS <br /> ` Jeff Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> Website:www.sjgov.org/ehd Rodney Estrada,REHS <br /> gCiFoa� Phone: (209)468-3420 Adrienne Ellsaesser,REHS <br /> Fax: (209) 464-0138 <br /> March 20, 2015 <br /> Mcllrath Family LTD, PTP <br /> P.O. Box 326 <br /> Stockton, CA 95201 <br /> Subject: Jamar Service Station <br /> 4075 E. Main Street <br /> Stockton, CA 95215 <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Work Plan for Additional Site Assessment Activities (work plan), dated 04 November 2014, <br /> prepared and submitted by your consulting firm, Cardno ATC (Cardno), on your behalf for the <br /> above-referenced site. By letter dated 21 July 2014, the EHD had directed the submittal of a <br /> work plan to delineate the petroleum hydrocarbon groundwater plume north/northeast of the <br /> former underground storage tank (UST) area where high concentrations of contaminants of <br /> concern have been detected. By letter dated 01 December 2014 the EHD had approved the <br /> work plan. Recent review of the site has led the EHD to revise the 01 December 2014 <br /> approval as follows: <br /> Soil samples were not proposed to be collected at 5-foot intervals utilizing cone <br /> penetration test (CPT) technology, nor were any soil samples proposed for laboratory <br /> analysis; <br /> The proposed well installations should be presented to the EHD for approval in the <br /> context of a revised conceptual site model (CSM) that includes the findings of the <br /> proposed CPT investigation; <br /> The EHD recommends installation of an additional CPT boring on the east side of Oro <br /> Avenue between the source area and the off-site MW-6C to better characterize the <br /> relationship between the source area impacted by total petroleum hydrocarbons <br /> quantified as gasoline (TPH-g); benzene, toluene, ethylbenzene and total xylenes <br /> (BTEX), and methyl tertiary-butyl ether (MTBE) — with little impact to the deep zone <br /> onsite, and the deep offsite occurrence of almost exclusively MTBE in MW-6C; and <br /> Specifically analyze the grab groundwater samples for TPH-g, BTEX, MTBE, ethyl <br /> tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), di-isopropyl ether <br /> (DIPE), and tertiary butyl alcohol (TBA) and includel,2-dichloroethane (1,2-DCA). <br />