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NOTE <br /> ATC Associates Inc. <br /> ov <br /> 1117 Lone Palm Avenue,Suite 201 <br /> %TC . <br /> Modesto,California 95351 <br /> 209-579-2221 <br /> a c ares i N c;.. fax:209-579-2225 <br /> January 15,2009 <br /> 54.25847.Q037 MED JE��//�� <br /> V d <br /> Ms. Victoria McCartney JAN 1 G 2009 -( <br /> San Joaquin County <br /> Environmental Health Department ENVIRONMENT HEALTH <br /> 600 East Main Street PERMIT/SERVICES f <br /> Stockton, California 95202 <br /> i <br /> Subject: Addendum to Workplan for Vertical and Lateral Subsurface Investigation, Former <br /> Cheaper Store#37, 15 East Grant Line Road,Tracy,California <br /> Dear Ms. McCartney: <br /> ATC Associates Inc. (ATC) has prepared this workplan addendum, on behalf of The Customer <br /> Company, describing proposed subsurface investigation activities to be conducted at the above <br /> referenced site (Figure 1). The purpose of the subsurface investigation is to evaluate the lateral <br /> and vertical extent of petroleum hydrocarbon impacted soil and groundwater. This workplan <br /> addendum was prepared in response to a correspondence letter issued by the San Joaquin County <br /> Environmental Health Department (SJCEHD) dated October 30, 2008. ATC generally concurs <br /> with the comments provided by the SJCEHD. As requested, the workplan has been revised and <br /> is being resubmitted as an addendum to the previous workplan. <br /> The revised scope of work includes: conducting:a survey with a private utility locater to locate <br /> and identify underground utilities at the site, obtaining drilling permits, obtaining off-site access <br /> authorization, advancing four soil borings.at the.site,collecting soil and groundwater samples for <br /> chemical analyses, completing the soil borings as,groundwater.monitoring wells, and preparation <br /> of a summary report. The revised scope of work is described in detail in the following <br /> paragraphs. <br /> I <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 u <br /> nleadedg asoline. 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-1, 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 1.2, 1988, petroleum <br /> i 5:\Environmenta1\25847\37 Tracy\Reports\wkp-addendum 2009.doe 1 <br /> f <br /> 1 <br />