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' 27 July 1998 <br /> AGE-NC Project No 95-0104 <br /> Page 3 of 4 <br /> 1 <br /> fully representative of ground water near the top of the saturated zone where fuel hydrocarbons <br />' would be expected to have the greatest impact <br /> Ground water monitoring data collected in June 1998 in the area of MW-1 through MW-6 indicated <br />' that the ground water flow direction was generally toward the northeast at a gradient of 0 006 ft/ft, <br /> or approximately 32 feet per mile (Figure 3) <br /> I <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br />' During the June 1998 sampling event, TPH-g was detected in water samples collected from MW-1, <br /> MW-5, and VW-1 at concentrations ranging up to 35,000 parts per billion (ppb, reported as <br />' micrograms per liter) <br /> BTE&X compounds were detected in samples collected from wells MW-1, MW-5, MW-6 and VW- <br />' 1 at concentrations ranging up to 4,600 ppb(xylenes, VW-1) Benzene was detected from well V W- <br /> 1 at a concentration of 180 ppb MTBE was not detected utilizing EPA Method 8020 <br /> lie Utilizing EPA method 8260, MTBE was detected in ground water samples collected from wells <br /> MW-1 and VW-1 at concentrations ranging up to 1 5 ppb, TBA was detected from MW-6 and VW-I <br /> at concentrations ranging up to 6 9 ppb Analytical results of selected ground water samples are <br /> summarized in Table 3 The laboratory reports (Alpha Analytical Laboratories Inc Batch No 98- <br /> 0610-008 and Kiff Analytical Report No 11743) and chain-of-custody forms are presented in <br /> Appendix B <br /> I4 0. DISCUSSION AND CONCLUSIONS <br /> Based upon data collected during the June 1998 monitoring event, AGE concludes <br /> - Ground water flow direction at the site(the area containing wells MW-1 through MW-6)was <br /> inferred to be moving toward the northeast, the gradient was calculated to be 0 006 ft/ft, or <br /> Iapproximately 32 feet per mile (Figure 3) <br /> The ground water surface elevation at the site continues to remain substantially above the <br /> I slotted screen intervals in wells MW-2 through MW-6 Samples collected from these wells <br /> may not be fully representative of dissolved petroleum hydrocarbon concentrations in <br /> shallow ground water <br /> - From March 1998 to June 1998,dissolved hydrocarbon-concentration increased substantially <br /> . in samples collected from well VW-1 <br /> Advanced GeoEnviron mental,Inc <br />