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URS <br /> RECDWED <br /> JUN 2 4 2003 <br /> June 20, 2003 <br /> ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Mr. Mike Infuma 02130 <br /> San Joaquin County 06, a3 <br /> Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California <br /> RE: Site Conceptual Model Report <br /> ARCO Service Station 2130 <br /> 906 North El Dorado Street, Stockton, California <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 AM/PM mini-mart. <br /> Currently, site facilities include double-walled fiberglass gasoline underground storage tanks (USTs), two <br /> dispenser islands, and associated product lines. <br /> Groundwater Use <br /> I <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 from the site. In addition, URS obtained a report from Environmental <br /> Data Resources (EDR) identifying wells within one-half mile of the site. <br /> URS Corporation <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 />