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16 2. SITE BACKGROUND 2.1 SITE LOCATION AND LAND USE Exxon RS 7-0137 is located at 1605 South El Dorado Street, Stockton, California. The site is located in southern Stockton, approximately 0.6 miles northeast of Interstate I-5 and lies at an elevation of approximately 16 feet above mean sea level (msl) (Figure 1). The:subjecfsite is currently-an active service station/EZ Mini-Mart with one 20,000-gallon double-walled ..fiberglass underground storage tank (UST) divided into two compartments that have 60 and 40 percent of the total volume capacity. Land use;in the immediate area of the site is mixed commercial, residential, and light industrial. The site is located between South El Dorado Street to the east and Center Street to the west and is bounded to the north by Second Street and to the south by Bugsy Bath Car Wash. Across Center Street to the northwest is Edison High School and to the southwest is Valley Lumber. Across Second Street to the north is Alhambra Motel. Across South El Dorado Street to the northeast,is a restaurant and to the east is a post office. Residential apartments are located approxigately 1,000 feet southeast of the site. A site map showing adjacent properties"is presented in Figure 2. "Idison High School, located at 1425 South Center Street,previously stored and dispensed fuel from two::USTs: one 500-gallon with leaded gasoline and one 10,000-gallon with diesel. The 1USTs were removed in November 1990. 2.2 REGIONAL GEOLOGY AND HYDROGEOLOGY The site is Iocated in the Central Valley,a geomorphic province which is a relatively flat alluvial plain approximately 450 miles long and 50 miles wide. The Central Valley trends northwest and C is a large asymmetrical structural trough containing a thick sequence of sediments ranging in age from Jurassic to Recent with the greatest depth of sediments in the western section. The site lies within the central section of the San Joaquin Valley. The San Joaquin Valley is bounded by the Sierra Nevada to the east and the Coastal Range to the west. As a structural trough, the Central Valley received sediment from the adjacent mountains under both marine and continental conditions. The Sierra Nevada are the source area of several thousands of feet of unconsolidated silty, sandy, and gravelly sediments within the basin. Subsurface investigations at the site indicate that the site is underlain by predominantly clayey } and silty sediments with lesser amounts of sand from the surface to a depth of approximately 60 feet bgs. The oldest significant water-bearing zone in the Stockton area is the Mehrten Formation on the east side of the county. The Mehrten Formation which plunges into the valley.from the east at approximately one to two degrees, reaching a total depth of about 800 to 1,000 feet bgs., is between 400 to 600 feet thick in the Stockton area. The underlying Valley Springs Formation produces minor quantities of fresh water. 70137.WPM.CL0S.WP.WPD 2 - j. C t