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of the site. (35) On average, 70 percent of Stockton's drinking water is surface water (bought from the Stockton East Water District), and 30 percent is groundwater. These percentages are dependent on drought conditions. During the rainy season, the system uses surface water exclusively.(36) The City of Stockton has a blended system serving approximately 80,000 people (37). There are 30 wells in the system. Six wells are within 4 miles of the site. (38) The City of Stockton purchases water from California Water Service and Stockton East Water Company to provide enough water for Stockton's water consumption. Last year, the City of Stockton purchased approximately 45 percent of its water from these companies (based on current records). (37) Three wells owned by the Diamond Walnut Growers, Inc. are approximately 3 miles east of the site. They are part of a blended system that has 236 service connections; 232 are residential and four are commercial. Based on the number of residential service connections, approximately 534 persons are served by the Diamond Walnut Growers, Inc. wells.(39) 3.2.3 Groundwater Pathway Conclusion. Depth to groundwater beneath the site is 12 feet to 25 feet bgs. Geological materials between ground surface and groundwater are characterized as sands and clays. (6) Groundwater flows to the east and southeast (33, 34). The nearest drinking water well is 1.25 miles east of the site. A total of 45 municipal and private drinking water wells are within 4 miles of the site. 3.3 Surface Water Pathway The nearest surface water body from the Cal Cedar site is the Mormon Slough, approximately 0.20 mile to the north (4). No drinking water intakes are associated with the Mormon Slough, the Stockton Deep Water Channel, and the San Joaquin Delta within 15 miles downstream of the site (40). Since 1925, the site has been paved in and around areas where hazardous substances are used and stored (7). Surface water runoff runs into the city's storm drain system (5). The length of drainage is approximately one mile from the site, where surface water discharges into the Mormon Slough (41). The Mormon Slough and the Port of Stockton do not support any sensitive environments. However, some areas of the San Joaquin River support the delta smelt, a federally designated threatened and state-designated endangered species. People use the Mormon Slough, the Port of Stockton, and the San Joaquin River for recreational fishing. Stripped and wide-mouth bass, channel catfish, and blue gill are the most common fish caught. The California Department of Fish and Game believes that people catch approximately 10,000 pounds of fish in the 13.75 mile stretch of the San Joaquin River downstream from the Port of Stockton. (42) No drinking water intakes are associated with the Mormon Slough, the Stockton Deep Water Channel, or the San Joaquin Delta within 15 miles downstream of the site (43). The 2 year, 24- hour rainfall event is approximately 1.6 to 1.8 inches (44). Cal Cedar is within a 500-year floodplain, and some areas around Mormon Slough are protected by levees from a 100-year flood (45). 3.4 Soil Exposure and Air Pathway Most of Cal Cedar has been paved since 1921. The pavement includes the area where hazardous substances are used and stored. (5) No residences or daycare centers are within 200 feet from the PA California Cedar Products-W (F) • 5/93 9 Printed on 50% recycled paper. ,C31