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between 39 and 40 feet below grade in the bore hole, indicating that <br /> the water is confined The static water level appears to be at a depth <br /> of approximately 37 feet below grade The tluckness of the water <br /> bearing layer appears to vary from less than 1 foot to more than 10 <br /> feet in the vicinity of the excavation <br />' There are currently six 4-inch-diameter morutoring wells installed <br /> on the site Measurement of depth to groundwater in the three of <br /> these wells showed a northerly groundwater gradient with a slope of <br />' 1 foot per 1000 feet (0 001) Monitoring well recharge rates were <br /> estimated during development and appear to range from 20 gpm to 60 <br /> gpm <br /> There is one production well located on the site approximately 500 feet <br /> south of the excavation The well previously provided the mill with <br />' water for sanitary use and for the fire sprinkler system A <br /> groundwater sample was collected from the well on January 22, 1990 <br /> No benzene, toluene, ethylbenzene or xylene were detected in that <br /> sample The well is not currently in use There are no other known <br /> wells within 500 feet of the investigation site <br /> Surface water in the area is limited to French Camp Slough, which <br /> runs northeast approximately 1500 feet from the site French Camp <br /> Slough is a tributary of the San Joaquin River that flows northward <br /> approximately 3 miles to the west of the site <br /> r iza tion <br /> On-site borings encountered sequences of clay and sand <br /> depth of 60 feet The typical geologic sequence encountered tiis showno a l <br /> below <br /> hlDesgn.ption offrm Ln <br /> 0.25 cl ay <br /> 25-35 coarse sand <br />' 35-45 fine sand <br /> grading to sandy clay <br />' 45`50 clay with internuttent sand lenses <br /> 50-G0 clay <br />' Detailed descriptions of the lithology beneath the site areresented in <br /> Section 3 p <br />' 1-5 <br />