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1 <br />' 17 May 1999 <br /> AGE-NC Project No 96-0249 <br /> Page 5 of 9 <br /> 3 1 SOIL PROFILE <br />' Generally, a dark brown toale brown medium dense to dense silty fine sand was encountered <br /> p � tY <br /> between 5 feet bsg and 15 feet bsg A brown, saturated, medium dense, fine sand was generally <br />' encountered between 15 feet bsg to 20 feet bsg A mottled gray/brown to brown, very stiff to hard, <br /> fine sandy silt was generally encountered at depths between than 20 and 30 feet bsg A brown, <br />' saturated, medium dense to dense, poorly sorted fine sand was encountered at 35 feet bsg <br /> Saturated soil was encountered at 10 feet bsg in borings MW-2 and MW-3, at 15 feet bsg in borings <br />' MW-5 and MW-6, at 25 feet bsg in MW-4 and at 35 feet bsg in MW-1 Boring logs are included in <br /> Appendix A General lithology beneath the site in cross-sectional view is depicted in Figures 3, 4 <br /> and 5 <br /> 1 <br /> 32 FIELD EVIDENCE OF HYDROCARBON-IMPACTED SOIL AND GROUND WATER <br />' Petroleum hydrocarbon odor was noted in soil sample duplicates collected from soil borings gs MW-1, <br /> MW-2 and MW-3 at depths between 5 and 15 feet bsg and from boring MW-6 between 15 and 20 <br /> feet bsg Organic vapor was detected from MW-1 through MW-6 soil sample duplicates at depths <br /> between 5 and 30 feet bsg (using a PID) at concentrations as high as 2,350 parts per million (ppm) <br />' Petroleum hydrocarbon odor was detected in quarterly ground water samples collected from all <br /> ground water monitoring wells except MW-4 <br /> 3 3 GROUND WATER ELEVATION AND GRADIENT <br /> On 02 April 1999, the depths to first encountered ground water in wells MW-1 through MW-6 <br /> ranged between 5 65 and 8 48 feet below the tops of well casings Ground water elevations were <br /> calculated to lie between 4 14 feet above mean sea level and 1 76 feet below mean sea level, ground <br /> water elevations,as measured on 02 April 1999, are depicted in Figure 12 The general ground water <br /> gradient at the site was calculated to be approximately 0 02 ft/ft or approximately 105 feet per mile, <br /> ground water was flowing towards the northeast in the area bound by wells MW-2, MW-3 and MW- <br /> 6, ground water was flowing northwest in the area bound by wells MW-2, MW-4 and MW-5 <br /> IIn April 1999, the depths to first encountered ground water in wells MW-1 through MW-6 were <br /> approximately two to five feet below the tops of the well casings Therefore, these wells are <br /> "properly screened", and yield samples fully representative of shallow ground water conditions <br /> Advanced GeoEnvironmental,Inc <br /> I <br />