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13 June 2001 <br /> • AGE-NC Project No 99-0637 <br /> Page 4 of 7 <br /> Bench Mark#64 at 3 5 03 feet above mean sea level(msl) The results of the monitoring well survey <br /> are contained in Table 1 The surveying field log is presented in Appendix D <br /> I3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 13 April 2001, the contaminant Impact to soil and ground water was quantified by the laboratory <br /> analytical data <br /> 31 STRATIGRAPHY <br /> Generally,dark brown to tan, damp to saturated,poorly graded sand and silty sand was encountered <br /> from surface grade to approximately 25 feet bsg Brown,damp,clayey silt was encountered between <br /> 15 feet and 20 feet bsg At 30 feet bsg clayey silt was encountered in MW3 and MW4, silty clay in <br /> MW 1 and poorly graded sand with silt in MW2 Lines of cross section are illustrated on Figure 2 and <br /> • stratigraphic cross sections are depicted on Figures 4 and 5 <br /> w detected in the soil sample collected from 25 feet bsg in monitoring well MW1 <br /> Organic vapor as d p g g <br /> at a concentration of 2 parts per million PID data is Included on the boring logs (Appendix A) <br /> 3 2 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> At the time of the April 2001 sampling event, depths to ground water in wells MW I through MW4 <br />' ranged from 15 32 feet to 16 02 feet below the well heads Ground water elevations at the site ranged <br /> from 18 48 feet above mean sea level (MSL) in well MW4 to 18 53 feet above MSL in well MW3, <br /> with the ground water elevation at 18 50 feet above MSL in wells MW 1 and MW2(Table 1) During <br /> this monitoring event, the depths to ground water in the wells were approximately 5 32 to 6 02 feet <br /> below the tops of the well screens, indicating that the wells are screened properly and yield <br /> representative shallow ground water samples <br /> The ground water flow direction was calculated using ground water elevation data from the <br /> monitoring wells on-site The flow direction was calculated to be toward the northwest, at a low <br /> gradient of 0 0007 feet/feet Figure 3 illustrates the contoured ground water elevations as measured <br /> on 13 April 2001 <br /> i <br /> Advanced GeoEnvironmental,Inc <br /> I <br />