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URS <br /> 03 JUN 26 h1410* 52 � <br /> aJune 6, 2403 D <br /> Mr Mike Infurna 02130 <br /> San Joaquin County 06 a3 <br /> Environmental Health Department <br /> 304 East Weber Avenue,Third Floor v� <br /> Stockton, California <br /> RE- Site Conceptual Model Report <br /> ARCO Service Station 2130 <br /> 7906 North El Dorado Street,Stockton,Califorma <br /> Dear Mr Infurna <br /> URS Corporation Americas(URS),on behalf of Atlantic Richfield Company(ARCO)has prepared this Site <br /> Conceptual Model (SCM) for ARCO service station no 2130 located at 7906 North El Dorado Street in <br /> Stockton, California(site) This report was prepared in response to the San Joaquin County Environmental <br /> Health Department(SJCEHD)letter dated October 2,2002, included as Appendix A,in which an SCM for <br /> • the site was requested <br /> The purpose of this SCM is to provide detailed modeling of the subsurface along with an evaluation of recent <br /> groundwater analytical data from existing site wells so that the petroleum hydrocarbon impacts at the site can <br /> be fully characterized <br /> BACKGROUND <br /> Site Setting <br /> The site is located at the northeast corner of the intersection of Hammer Lane and El Dorado Street in <br /> Stockton,California(Figures 1 and 2) The site is an operating ARCO service station and ANWM mini-mart <br /> Currently, site facilities include double-waited fiberglass gasoline underground storage tanks (USTs),two <br /> dispenser islands, and associated product lines <br /> Groundwater Use <br /> In April 2003, URS conducted a well records file review at the Department of Water Resources (DWR) <br /> The information requested was as follows general well information, and production well information for <br /> wells within a radius of 2,000 feet fr6the site In addition, URS obtained a report from Environmental <br /> Data Resources (EDR)identifying wefis within one-half mile of the site <br /> URS Group Inc <br /> Crown Corporate Center <br /> 2870 Gateway Oaks Drive Suite 300 <br /> Sacramento CA 95833 <br /> Tel 916 679 2000 <br /> Fax 916 679 2900 <br />