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' 3 REGIONAL GEOLOGY AND HYDROGEOLOGY <br /> The site is underlain by the Lower Member of the Modesto Formation which is of <br /> Pleistocene age. Sediments of this formation consist of unconsolidated clay, silt, and sand <br /> (Wagner, et. al., 1987). <br /> The site is in the Eastern San Joaquin County Ground-Water Basin (California <br /> Department of Water Resources, 1980). According to this reference, the groundwater <br /> basin has been developed for intensive irrigation, and for domestic, industrial, municipal, <br /> and stock use. <br /> 1 <br /> i� <br /> SALIN�P10\080MO51470.I BS-95\pas:1 Rev.0,2/6196 <br /> 0805-147.01 3.1 <br />