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R <br /> PRELgQ ARY HYDROGEOLOGIC ASSESSMENT REPORT <br /> �. 5491 IF Street,Banta,Catiromia <br /> F Delta Projeet No.40.85-481 <br /> Page 6 <br /> k. TABLE 4 <br /> i <br /> Well Number Year Drilled Use <br /> 1 1981 Domestic <br /> 2 1955 Domestic <br /> 3 1981 Domestic <br /> 4 1980 Domestic <br /> 5 1981 Domestic <br /> 6 1952 Domestic <br /> 7 1976 Do,.Vstic <br /> g 1972 Domestic <br /> 9 . 1973 Domestic <br /> 10 1978 Domestic <br /> 11 1978 Domestic <br /> 12 1978 Domestic <br /> 13 1952 Stock + <br /> 14 1946 Unknown <br /> ij <br /> 15 1953 Domestic <br /> g 16 1950 Irrigation <br /> s 17 1955 Test <br /> 18 117$ Unknown <br /> 19 1981 Domestic <br /> 20 1979 Domestic <br /> 3.0 BACKGROUND INFORMATIQN I <br /> 3.1 Re l-3npl GeoloQv <br /> i <br /> z Banta, California, is located within the Great Central Valley Geomorphic Province of CAliiornia. The 1 <br /> Central Valley Province is bordered to the east by the Sierra Nevada Mountains, and to the west by the <br /> Coast Range. Surface geology in the Banta area consists primarily of recent alluvium and the Recent <br /> L to Pleistocene age flood basin deposits. Both units consist of gravel, sand,silt,and clay lenses. Recent <br /> r...- alluvium deposits typically do not exceed 150 feet in thickness. Flood basin deposits crop out <br /> approximately one mile northwest of Banta, Maximum thickness of flood basin deposits is 1,400 feet. <br /> This unit is typically finer-grained than the alluvial dep--sits, and may also contain appreciable amounts <br /> f L <br /> --- -of organic matter. <br /> .. 3.2 Site Geology <br /> zW <br /> law <br /> 4 The surface of the site consists of a 2-inch-thick layer of asphalt overlaying a 4-inch-!hick layer of <br /> I 'J aggregate base. Subsurface geology at the site was determined from soil borings advanced by ETS <br /> or <br />