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Site Background Information DEN'S AUTO REPAIR 308 South El Dorado Street, Stockton, California The site is located at 308 South El Dorado Street in a commercial/industrial area of south Stockton, California, at the southeast corner of the intersection of South El Dorado Street and East Lafayette Street.A single structure is located on the property and is currently utilized as an auto repair facility (Figure 2). REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The site is located in an area of low topographic relief. According to Geologic Map of California, published in 1966 by the California Department of Conservation Division of Mines and Geology, the site area is shown to be within the Great Valley Geomorphic Province(GVGP)of California,a large, elongate, northwest-trending structural trough. The GVGP is subdivided into two major divisions,designated the Sacramento and San Joaquin Valleys,which have been filled to the present elevation with thick sequences of sediment. These sediments range in age from Jurassic to Recent, and create a nearly flat-lying alluvial plain that extends from.the Tehachapi Mountains in the south to the Klammath Mountains in the north. The western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada, respectively. Based on data collected during quarterly ground water monitoring events, the average depth to ground water at the site is approximately 25 feet below surface grade(bsg). WELL SURVEY At the request of Mr. Den Ueda,(AGE)has prepared this Sensitive Receptor Survey for 308 South El Dorado Street,Stockton,California,as required by the San Joaquin County Environmental Health Department by letter dated.07 February 2005. A sensitive receptor survey is required as part of site characterization requirements under the California Code of Regulations - Title 23, Division 3, Chapter 16, Section 2654. sensitive receptor survey was to locate potential vertical conduits including municipal, domestic, irrigation or ground water monitoring wells within a 2,000-foot radius of the site. Drinking water near the site is currently supplied by the City of Stockton municipal well system.The municipal wells in the site area are maintained by California Water Service Company(Cal-Water). According to Cal-Water,there are no municipal wells within an approximately 2,000-foot radius of the site. On 17 October 2006, AGE representatives reviewed well drillers' reports from the DWR for water wells located in the surrounding area.Drillers'reports for four water wells located within an approximately 2,000-foot radius of the site were identified:-One well was located at 520 East Main Street; One well was located at 202 East Lafayette Street; One well was located at 22 Market Street; One-well was located 222 East Weber Avenue. j Advanced GeoEnvironmental,Inc. _/