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ATC Associates Inc. <br /> 1117 Lone Palm Avenue,Suite 201 <br /> Modesto,California 95351 <br /> 209-579-2221 <br /> -- < <br /> ASSOC aarE.s. rnrc .. fax:269-579-2225 <br /> , ' <br /> August 10, 2009 <br /> 54.25847.Q037 <br /> r4' <br /> . ,, <br /> Ms. Victoria McCartney <br /> San Joaquin County <br /> Environmental Health Department <br /> 600 East Main Street <br /> Stockton, California 95202 <br /> Subject: Revised Workplan to Evaluate the Lateral and Vertical Extent of Impacted Soil <br /> and Groundwater, Former Cheaper Store #37, 15 East Grant Line Road, Tracy,. <br /> California <br /> Dear Ms. McCartney: <br /> ATC Associates Inc. (ATC) has prepared this,revised workplan and letter response, on behalf of <br /> The Customer Company, describing proposed subsurface investigation activities to be conducted <br /> at the above referenced site (Figure 1). The purpose of the subsurface investigation is to <br /> evaluate the lateral and vertical extent of petroleum hydrocarbon impacted soil and groundwater <br /> in the vicinity of the site. This revised workplan and letter response was prepared in response to <br /> a correspondence letter issued by the San Joaquin County Environmental Health Department <br /> (SJCEHD) dated June 22, 2009. <br /> The revised scope of work includes: conducting a survey to locate and identify underground <br /> utilities at the site, obtaining drilling permits, obtaining off-site access authorization, advancing <br /> three soil borings at the site, collecting soil and..groundwater samples for chemical analyses, and <br /> preparation of a summary report. The revised scope of work is described in detail in the . <br /> following paragraphs. <br /> SITE HISTORY <br /> Two 10,000-gallon underground storage tanks (USTs) were excavated and removed from the site <br /> on March 3, 1988. One UST was used'to store leaded gasoline and the other UST was used to <br /> store unleaded gasoline. Groundwater was encountered in the UST excavation at approximately <br /> seven feet below ground surface (bgs). .Laboratory analyses of two samples of groundwater <br /> collected from within the excavation indicated the groundwater had been impacted by petroleum <br /> hydrocarbons. <br /> On March 29 and 30, 1988, three monitoring wells (MW-T,MW-2, and MW-3) were installed at. <br /> the site and Kleinfelder conducted a sensitive receptor survey within a 2,000-foot radius of the <br /> site. Based on Kleinfelder's Groundwater Assessment Report dated April 12, 1988, petroleum <br /> S:\Environtnenta1\25847\37 Tracy\Reports\Response 2009 Aug.doc 1 <br /> i <br /> lj <br />