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i <br /> (YVATC <br /> � 1117 Lone Palm Avenue, SuiteID <br /> Modesto, CA 9535www.atcassocfates.con, <br /> MAP, 1 7 lUU6 209-579-2221 <br /> A s s o c I A T e s i a c . Fax 209-579-2225 <br /> Environmental,Geotechnical and Materials Engineers ENVRUNMCN i HLAL1 H <br /> March 16, 2006 PLKMI <br /> 54.268740001 a <br /> Ms. Victoria McCartney <br /> San Joaquin County Environmental Health Department <br /> 304 E. Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject: Workplan Addendum for Jay's Mini Mart, 3302 North West Lane, Stockton, <br /> California <br /> Dear Ms. McCartney: <br /> ATC Associates Inc. (ATC) has prepared this letter to serve as an addendum to ATC's January 12, <br /> 2006, Workplan for Additional Subsurface Investigation prepared on behalf of Mr. Jay M`Ilrath <br /> relating to proposed subsurface investigation activities at the above referenced site (Figure 1). This <br /> addendum has been prepared pursuant to February 6, 2006, correspondence from you and Mr. Nuel <br /> Henderson of the San Joaquin County Environmental Health Department(SJCEHD). <br /> Proposed Soil Boring Locations <br /> Subsequent to submittal of the above referenced workplan, ATC reviewed the SJCEHD regulatory <br /> file for the subject site to evaluate initial corrective actions conducted by others at the site and the <br /> associated data. Information contained in the SJCEHD file reviewed by ATC indicates a soil sample <br /> was collected from the eastern ends of the two dispenser islands formerly located in the southern <br /> portion of the site in November 1997 at depths ranging from three to four feet below ground surface. <br /> Petroleum hydrocarbons were reportedly not detected in these soil samples. ATC concurs with the <br /> SJCEHD recommendation to eliminate the previously proposed boring located south of the former ---- <br /> location of the southernmost fuel dispenser, and the two previously proposed borings located east and <br /> west of the former locations of the southern fuel dispensers. ATC also proposes to advance a boring <br /> north of the underground storage tanks in the landscaped area along the property boundary. <br /> Petroleum impacted soil was encountered beneath the northwestern portion of the westernmost <br /> underground storage tank in November of 1997. <br /> The borings will be advanced using the methodology previously indicated in the workplan dated , <br /> January 12, 2006. A total of six soil borings are proposed. The locations of the borings are shown on <br /> Figure 2. As stated in the January t2, 2006, workplan, if sufficient groundwater is encountered above <br /> the terminal depth of the borings, grab groundwater samples will be collected and submitted for <br /> laboratory analyses. Selected soil samples and potential groundwater samples will be analyzed for <br /> total petroleum hydrocarbons quantified as gasoline (TPHg) and total petroleum hydrocarbons <br /> quantified as diesel (TPHd) by EPA Method 8015M, and benzene, toluene, ethyl benzene, and <br /> xylenes (BTEX), methyl tert-butyl ether (MTBE), t-butanol (TBA), ethyl dibromide (EDB), and 1,2- <br /> dichloroethane (1,2-DCA)by EPA Method 8260B. <br /> 1 <br />