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Bennett Properties December 28, 1987 Page 3 The area surrounding the metal building is generally open, with no asphalt or concrete covering the sandy soils. On the date of our site visit, there were puddles of standing water in this area; these were generally clean-looking with no oily sheen, but water in the puddles immediately north of the metal building did have an oily sheen. Beyond the open area surrounding the building and extending to the property lines, the property is open and grass-covered. A few spots of dead vegetation, approximately 4 feet in diameter, were noted. The vegetation at one of these spots, located southeast of the metal building, had an oily smell. Occasional trees are present on the southwest and eastern por- tions of the site. There are a few piles of debris on the site, and some rail- road ties scattered about the site. No hazardous material containers were noted in the debris piles. Paper and other light trash seem to have been blown against the southern fence. The entrance to the property is a mostly unpaved driveway off of South Main Street. A water well is located immediately east of the metal building as shown on Plate 2. It was not possible to measure the water level on the date of our site visit. However, Mr. Martinez told us that the the water surface is typically 20 to 25 feet below grade (Martinez, 1987) . A septic tank is present immediately south of the building, as indicated or. the Site Plan. The septic tank filter bed lies 80 feet west of the tank, based on the 1976 septic tank permit on file at the San Joaquin County Department of Environmental Health. The site has been used in recent years by R.G. Martinez Trucking, as a truck parking and routine maintenance area (Martinez, 1987) . Details of this operation, as well as previous site usage are described below in the Site History. SOIL AND GROUNDWATER CONDITIONS Surface soils exposed at the site are sandy. Based on nearby borings, we expect that sandy and silty soils extend to a depth of at least 40 feet (Dames fi Moore, 1962) . Alternating sandy and clayey soils result in poorly defined aquitards in the region (Boll, 1987) . Three groundwater zones are anticipated at the site: • a shallow water table with the water level approximately 10 feet below grade;