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2.0 CONCEPTUAL SITE MODEL 2.1 Physical Characteristics The site is located on the northwest corner of the intersection of East Harding Way and El Dorado Avenue in Stockton, California The site overlies an old slough that extended along the north side of Harding Way prior to widening of the road The site operated as a retail gasoline station from 1947 to 1988 Land use in the vicinity of the site is primarily resi- dential and light commercial The site property is bounded to the east by a 9hdLQjiWaftcts Jh01z/1 Company service station, to the west by a residence, to the south by a restaurant and ARCO AM/PM Mini-Mart, and to the north by medical offices (Figure 2) The retail gasoline station improvements included two generations of UST clusters Limited information is currently available regarding the first generation facilities The first generation • cluster, based on available data, consisted of four steel gasoline USTs, (4,000-, 3,000-, 1,000-, and 550-gallon) These tanks were located in the eastern portion of the site (Figure 3) In 1984, the second generation product facilities were installed at the site These facilities consisted of three fiberglass gasoline USTs (10,000-gallon) located m a common excavation in the central portion of the site one fiberglass used-oil UST (1,000-gallon) located behind the former station building, and three product islands These facilities were removed in 1988 when the station was decommissioned The nearest surface water to the site is Yosemite Lake located at the east end of Srruth Canal, approximately 3,500 feet west of the site, and the deep water channel of the San Joaquin River located approximately 4,500 feet south of the site The site lies at an approximate elevation of 13 feet above mean seal level, topography in the vicinity is essentially flat Regional groundwater flow paths merge toward central and western Stockton due to exten- sive pumping of water wells in this area (EA, January 1989) A well survey (EA, 1988) was performed for the site using data from the California State Department of Water Resources (DWR) Using these data, seven water wells were identified within 112 mile of the site The closest well is a domestic well located at 919 Center Street approximately 1,700 feet south (upgradient) of the Chevron station • 3201337B/CAP AMID DOC 2 November 30, 1995