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0 0 <br /> k�CrXIDENC <br /> Midland Fault Zone which is locatedro <br /> app xunnately 25 miles northwest of the site The San <br /> Andreas fault zone is also present approximately 50 miles west of the site <br /> The soils beneath the site characterized during the February 1993 drilling (Wallace- <br /> Kuhl) consisted of fine sands and silt/sand mixtures to approximately 50 feet below ground <br /> surface (bgs) Below this depth, a fine to coarse sand and silty clay are present Similar soils <br /> were reportedly observed to a depth of 15 feet bgs during the 1990 USTs removal <br /> 1.4 Hydrology and Hydrogeology <br /> Groundwater was encountered during drilling in February 1993 (Wallace-Kuhl) at <br /> depths ranging from 46 to 49 feet bgs Groundwater measurements on February 24, 1993 <br /> indicated that groundwater had stabilized at a depth of approximately 45 feet bgs Based on <br /> those water level measurements, the groundwater flow direction beneath the site was <br />' calculated to be flowing to the northeastw th a hydraulic gradient of 0 001 foot/foot (fl/ft- <br /> The groundwater aquifer beneath the site is considered by the State Regional Water Quality <br /> 1• Control Board (SRWQCB) to be a aquifer of beneficial use <br /> The site has been graded and modified to promote surface drainage Catch basins <br /> r collect rainwater for flow north through underground pipes into the 4acent airport storm <br /> water system Eventually, surface drainage is to Little John Creek, a water course oriented <br /> east to west approximately 15 miles north of the Site Little John Creek flows into Camp <br /> Slough and eventually into the San Joaquin River <br /> 3 <br />