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i <br /> I15 June 2001 <br /> AGE-NC Project No 96-0263 <br /> Page 4 of 6 <br /> 28 WELL HEAD SURVEY <br /> IOn 10 April 2001, representatives of AGE surveyed a reference point on the top of ground water <br /> monitoring wells MW9, MW 10 and MWI I at the site to the nearest 0 01-foot relative to ground <br />' water monitoring well MW2 at 37 18 feet above mean sea Ievel (msl) The results of the casing <br /> elevation survey are contained in Table 1 The surveying field log is presented in Appendix D <br /> 30 FINDINGS <br /> fGround water elevation, flow direction and gradient were determined from field data collected on <br /> 30 March 2001, the contaminant impact to soil and ground water was assessed from the laboratory <br /> analytical data <br /> 31 STRATIGRAPHY <br /> Generally, light brown to brown, moist to saturated, silty clay was encountered in the pilot borings <br /> I at approximately 5 feet, 10 feet and 20 feet bsg Light brown, saturated silty sand was encountered <br /> at 11 feet bsg and dark brown, saturated, poorly graded sand was encountered at 15 feet bsg Lines <br /> of cross section are illustrated on Figure 2 and stratigraphic cross sections are depicted on Figures <br />' 4and 5 <br /> Organic vapor was not detected in the soil samples collected from the monitoring well pilot borings <br />' PID data is included on the boring logs (Appendix A) <br />' 3 2 GROUND WATER GRADIENT AND FLOW DIRECTION <br />' The elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> from the surveyed well casing elevations (Table 1) For the March 2001 sampling event, depths to <br /> ground water ranged from 7 01 feet to 8 09 feet below the tops of the well casings Ground water <br />' elevations at the site ranged from 28 83 feet above mean sea level (msl) in well MW9 to 29 64 feet <br /> above msl in wells MW I and MW 11 <br /> I The ground water flow direction was determined by contouring the ground water elevation data The <br /> ground water at the site was inferred to be flowing to the northwest at an average gradient of 0 004 <br /> feet/feet or 21 feet per mile The ground water contours are depicted on Figure 3 <br /> I <br /> I <br /> I <br />