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a 2.0 CONCEPTUAL SITE MODEL 2.1 Physical Characteristics The site is located in Lincoln Center at the intersection of Pacific Avenue and Benjamin Holt Drive in Stockton, California Land use near the site and within Lincoln Center is primarily commercial and residential including three known fuel cases where sources of volatile organic compounds and specifically tetrachloroethene (PCE) have been identified The site property (6633 Pacific Avenue) is bordered by Pacific Avenue to the east, Benjamin Holt Drive to the north, Lincoln Center parking lot to the west, and Tower Records to the south (Figure 3) Topography at the site is relatively flat, surface water drainage is to the southeast In December 1986, the station was remodeled and the product distribution facilities which consisted of three USTs, a fuel island, and product piping were replaced at the site The former tank complex was backfilled and the new USTs were located in the southwestern corner of the site At this time, the station was upgraded and an additional fuel island was - installed and the former 550-gallon waste oil tank was replaced with a 1,000-gallon tank The existing service station retails unleaded, premium unleaded, and super unleaded gasoline The nearest surface water is Fivemile Creek, approximately 3,000 feet to the northwest Fiveinile Creek flows southwest toward Fivemile Slough, which flows into the San Joaquin Delta Site elevation is approximately 15 feet above mean sea level (MSL), regional ground- water flow is to the southwest Groundwater elevations in the Stockton area have declined in recent years and poor quality groundwater from the San Joaquin Delta has migrated east toward Stockton Water quality in the Stockton area has been affected and groundwater- supply wells have been abandoned in the western part of the region New wells have been drilled in the eastern part of the city and groundwater use has been supplemented by supplies from the Calaveras River A well survey (Sierra 1992) was performed for the site using data from the California State Department of Water Resources (DAR) Using this data, 30 water wells were identified within 112 mile of the site Two of the wells identified in the well survey, a domestic well and a municipal well are potentially downgradient of the site These wells are both more than 1/4 mile southeast of the site 3201357B1CAP 2 April 4 1995