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nearest mapped natural drainage is Mormon Slough, passing within 7,000 feet (to the south) of the site. The site is 25 feet above mean sea level. The area south of Fremont A--►enue has municipal Water available, while the area north of Fremont Avenue does not. Consequently, the ground water in the area of the site is extensively used. A survey of the California Department of Water Resources (CDWR) well records identified eight wells within 0.5 mile of the site (Figure 1; Table 2) . Of these eight wells, seven are listed as domestic, one as industrial (Wood Canning Company) , and no municipal wells are indicated. In order to confirm the absence of municipal supply wells, inquiries were me.de with the City of Stockton Utilities Department (Mr. Dwayne Cox, pezz. comm. , 9-21-87) and •with California Water Service (Mrs. Pyle, pers. comm. , 9-3-87) . These individuals indicated that (1) the City' s nearest municipal supply well is located more than 1 mile • to L4, south, just north of Charter Way; (2) California Water Service has no wells "in the area", the nearest one being located some 2.1 miles to the west, at 1111 N. E1 Dorado. In addition to the wells listed in Table 2, four private domestic wells within 0.25 miles of the site were discovered in a house- to-house survey conducted by EA on 20 August 1987. The nearest one is located some 250 feet west of the site, at 3206 East Fremont Street. its depth is 150 to 200 feet. According to the driller' s report, the owner in 1965 was the Broadway Hatchery. The next-nearest well is located about 500 feet north of the site (759 Windsor Avenue) , and has unknown depth. 1.3 RISK ASSESSMENT Risk assessment (RA) is a multidisciplinary data interpretation tool for evaluating the potential threats to human health and the environment resulting from chemical releases. In recent years it has been applied extensively to Superfund sites as part of the 3