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1.3 Geology and Hydrogeology <br />' Geology <br /> The site is located in the San Joaquin Valley The San Joaquin Valley makes up the southern portion <br /> of the Central Valley Geomorphic Province The surface and subsurface sediments in the Central <br /> Valley were formed or deposited primarily under fluvial conditions The area is underlain by <br /> Quaternary-age alluvial sediments <br /> Soils at the site are generally fine to medium grained sands with occasional silty sands Boring logs <br /> presented by GeoAudrt, Inc describe dark brown, fine-grained sand to a depth of approximately 10 <br /> feet below grade surface(bgs) Bown and white,loose, medium to coarse-grained sand was observed <br /> from 10 feet bgs to a depth of about 20 feet bgs Below 20 feet, the soils were described as brown, <br /> moist, fine-grained clayey sand <br /> Hydrogeology <br /> I First groundwater was reported by Remedy, Inc (April 1997)to be at approximately 12 5 feet bgs <br /> The GeoAudrt investigation reported groundwater at 15 feet bgs At the time of tank replacement <br /> activities (June 1998), groundwater was encountered at approximately 11 feet below grade surface <br /> Groundwater gradient conditions at the site are not known However, it is believed that the <br /> groundwater flow direction at the site is to the west or northwest <br /> Franks One Stop, 2072 W Yosenute Ave , Manteca, CA August 11, 1998 <br /> Well Survey Report File 015-WS RPT <br /> 5 <br /> I <br />