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1 <br /> I <br /> 30 November 1998 <br /> AGE-NC Project No 95-0104 <br /> Page 3 of 5 <br /> During the September 1998 monitoring event, ground water was approximately 20-feet above the <br /> top of the screened intervals of morutonng wells MW-2, MW-3 and MW-4, and was approximately <br /> 3 and 7 5-feet above the screened intervals of MW-5 and MW-6, respectively As a result, the <br /> screened Intervals from these wells are completely submerged, and may not yield water samples <br /> fully representative of ground water conditions near the top of the saturated zone where fuel <br /> hydrocarbons would be expected to have the greatest impact Due to the deep drowning of MW-2, <br /> IMW-3 and MW-4, the three wells were not purged or sampled <br /> I Ground water morutonng data collected in September 1998 in the area of MW-1 through MW-6 and <br /> VW-1 indicated that the ground water flow direction was generally toward the northeast at a gradient <br /> of 0 003 ft/ft, or approximately 18 feet per mile (Figure 3) <br /> I <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> During the September 1998 sampling event, TPH-g was detected in water samples collected from <br /> MW-6 and VW-1 at concentrations of 83 micrograms per liter (µg/1) and 5,800 µg/1, respectively <br /> I• Various BTE&X compounds were detected In water samples collected from wells MW-1 and VW-1 <br /> at concentrations ranging up to 660µg/l (xylenes, VW-1) Benzene was detected from well VW-I <br /> at a concentration of 45 4g/l <br /> MTBE was detected in a water sample collected from MW-1 at a concentration of 1 µg11, TBA was <br /> detected in a water sample collected from MW-5 at a concentration of 6 3 Mcg/l No other fuel <br /> oxygenating compounds were detected from analyzed water samples <br /> Analytical results of selected ground water samples are summarized in Table 2 The laboratory <br /> reports(Alpha Analytical Laboratories Inc Batch No 98-0915-012 and Kiff Analytical Report No <br /> I12280) and chain-of custody forms are presented in Appendix B <br /> I4.0. DISCUSSION AND CONCLUSIONS <br /> Based upon data collected during the September 1998 monitoring event, AGE concludes <br /> I • Groundwater flow direction at the site(the area contaningwe <br /> lis MW-1 through MW-6 and <br /> I VW-1) was inferred to be moving toward the northeast, the gradient was calculated to be <br /> 0 003 ft/ft, or approximately 18 feet per mile (Figure 3) <br /> • • The ground water surface elevation at the site continues to remain substantially above the <br /> I <br /> Advanced GeoEnvironmentsl,Inc <br /> I <br />