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18 September 1998 <br /> AGE-NC Project No 95-0173 <br /> Page 5 of 8 <br /> 3 1 SOIL PROFILE <br /> Generally, interbedded pale brown to gray/brown, silty sands and silty clays/clayey silts were <br /> encountered between 15 feet bsg and 90 feet bsg A gray, saturated fine to coarse sand was <br /> encountered from soil boring MW-10 at depths between 30 and 40 feet bsg A gray-green, very <br /> moist, silty, fine to medium sand was encountered in soil boring B10 between 75 feet bsg to 80 feet <br /> bsg <br /> Saturated soil was encountered in boring MW-10 at depths between 25 and 30 feet bsg Boring logs <br /> are included in Appendix A <br /> I3 2 FIELD EVIDENCE OF HYDROCARBON-IMPACTED SOIL AND GROUND WATER <br /> No petroleum hydrocarbon odor, vapor or discoloration were observed in any soil or ground water <br /> samples collected from B10 and MW-10 through MW-12 <br /> 10 Faint to moderate petroleum hydrocarbon odor was noted in ground water samples collected from <br /> wells MW-1, MW-4, MW-9 and AW-213, intense petroleum hydrocarbon odor was noted in ground <br /> water samples collected from wells MW-2, MW-3, MW-6, AW-1B and VW-1 Ground water <br /> samples collected from well MW-8 emitted a different, unidentified odor not encountered in the <br /> other wells <br /> 3 3 QUARTERLY GROUND WATER ELEVATION AND GRADIENT <br /> On 17 July 1998, the depths to ground water in wells MW-1 through MW-12 ranged between 23 63 <br /> and 26 01 feet bsg Ground water elevations, as measured on 17 July 1997, are depicted in Figure <br /> 6 In July 1998, the general ground water gradient at the site was calculated to be approximately <br /> 0 002 ft/ft or approximately 13 feet per mile and directed towards the northeast Due to the low <br /> gradient at the site, slight variations in ground water measurements or changes of recharge/discharge <br /> of the local ground water could greatly modify the inferred ground water flow direction <br /> 34 ANALYTICAL RESULTS OF SOIL SAMPLES <br /> A total of nine soil samples were submitted to a state-certified laboratory for analysis of TPH-g, <br /> TPH-d, BTE&X and fuel oxygenates. Utilizing EPA Methods 8015M, 8020 and 8260M, the <br /> laboratory did not detect any petroleum hydrocarbons at concentrations above the laboratory <br /> reporting limits The analytical results of selected soil samples are summarized in Table 1 The <br /> Advanced GeoEnvironmental,Inc <br />