Laserfiche WebLink
1 <br /> 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 thickness 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 monitoring 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 /> ISurface 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 /> it <br /> riz n <br /> On-site borings encountered sequences of clay and sand to a total <br />' depth of 60 feet The typical geologic sequence encountered is shown <br /> below <br />' Depth (W Description of formation <br /> 0-25 clay <br />' 25-35 coarse sand <br /> 35-45 fine sand grading to sandy clay <br /> 45-50 clay with intermittent sand lenses <br /> 50-60 clay <br /> Detailed descriptions of the lithology beneath the site are presented in <br />' Section 3 <br />' 1-5 � <br />