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IkVCF <br /> N*X% irNC <br /> I Franciscan Complex Structurally significant features include the Stockton Fault which trends <br /> northeast-southwest and is approximately eight miles northwest of the Site and the Midland <br /> Fault Zone which trends north and is approximately 25 miles northwest of the site The San <br /> Andreas fault zone is approximately 50 miles west of the site <br /> The soils beneath the Site characterized during the February 1993 drilling (Wallace-Kuhl) <br /> consisted of fine sands and silt/sand mixtures to approximately 50 feet below ground surface <br /> (bgs) Below this depth a fine to coarse sand and silty clay are present Similar soils were <br /> reportedly observed to a depth of 15 feet bgs during the 1990 UST removal <br /> 1.3 Hydrology <br /> Y eY <br /> Groundwater was encountered during drilling in February 1993 at depths ranging from 46 <br /> to 49 feet bgs Measurements on February 24 1993, indicated that groundwater had stabilized at <br /> a depth of approximately 45 feet bgs The groundwater flow direction beneath the site was <br /> calculated to be to the northeast with a hydraulic gradient of 0 001 feet/foot (ft/ft) <br /> 1The Site has been graded and modified to promote surface drainage Catch basins collect <br /> rainwater for flow north through underground pipes into the adjacent airport storm water system <br /> Surface drainage is to Little John Creek a water course oriented east-west, approximately 1 5 <br /> miles north of the Site Little John Creek flows into Camp Slough and eventually into the San <br /> Joaquin River <br /> On May 29, 1996, the depths to groundwater in the three monitoring wells, MWA, MW- <br /> 2, MW-3 were 42 57, 42 60, and 42 31 feet bgs, respectively The hydraulic gradient was <br /> calculated to be 0 003 ft/ft to the northeast Groundwater elevations and gradient are shown on <br /> Table 1 and on Figure 3 <br /> P IDSAIST0CKT0N1337200111 STQTR RPT <br /> 1 <br />