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PRELIMINARY HYDROGEOLOGIC ASSESSMENT REPORT <br /> 5491 'F' Street, Banta, California <br /> Delta Project No. 40-88-481 <br /> Page 6 <br /> TABLE 4 <br /> Well Number Year Drilled Use <br /> 11981 Domestic <br /> 1955 Domestic <br /> 3 1981 Domestic ; <br /> 4 1980 Domestic <br /> 5 1981 Domestic <br /> 6 1952 Domestic <br /> 7 1976 Domestic <br /> 8 1972 Domestic ' <br /> 9 1973 Domestic <br /> 2 10 1978 Domestic <br /> 11 1978 Domestic <br /> 12 1978 Domestic <br /> 13 1952 Stock <br /> 14 1946 Unknown <br /> 15 1953 Domestic <br /> 16 1950 Irrigation <br /> 17 1955 Test <br /> 18 1979 Unknown <br /> 19 1981 Domestic <br /> 20 1979 Domestic <br /> 4 <br /> 3.4 BACKGROUND INFORMATION <br /> I` 3.1 Regional Geology <br /> Bahta,- California, is located within the Great Central Valley Geomorphic Province of California. The <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 /> to PIeistocene age flood basin deposits. Both units consist of gravel, sand, silt, and clay lenses. Recent <br /> alluvium deposits typically do not exceed 150 feet in thickness. Flood basin deposits crop out <br /> iapproximately 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 deposits, and may also contain appreciable amounts <br /> of organic matter. <br /> 3.2 Site GeoloQr+ <br /> The surface of the site consists of a 2-inch-thick layer of asphalt overlaying a 4-inch-thick layer of <br /> i <br /> aggregate base. Subsurface geology at the site was determined from soil borings advanced by FTS <br /> N , <br /> r <br />