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