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I <br /> 27 July 1998 <br /> AGE-NC Project No 95-0121 <br /> IPage 3 of 4 <br /> 17 55 feet below the tops of the well casings Between September 1996 and June 1998,ground water <br /> elevation generally increased an average 9 03 feet at the site The ground water elevation data for <br /> MW-1 though MW-5 during June's ground water monitoring event is depicted in Figure 3 <br /> IDuring the June 1998 monitoring event, ground water was between 1145 and 13 13 feet above the <br /> screened intervals in monitoring wells MW-1 through MW-5 Therefore, ground water monitoring <br /> well MW-3 is "drowned", and may not yield a sample fully representative of ground water <br /> conditions near the top of the saturated zone, where fuel hydrocarbons would be expected to have <br /> the greatest impact <br /> In June 1998,the gradient was calculated to be 0 002 ft/ft, or approximately 13 feet per mile(Figure <br /> 3)for the area located between wells MW-1 through MW-5 Ground water monitoring data collected <br /> in the area of MW-1 through MW-5 suggests that the ground water flow direction was generally <br /> toward the east Due to the low gradient at the site, slight variations in ground water measurements <br /> or changes of recharge/discharge of the local ground water could greatly modify ground water flow <br /> direction <br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> Utilizing EPA method 8015M,TPH-g was detected in the ground water sample collected from MW- <br /> 3 at a concentration of 40,000 parts per billion (ppb, reported as micrograms per liter) <br /> Utilizing EPA method 8020, BTE&X compounds were detected in the sample collected from well <br /> MW-3 at a concentration of 7,400 ppb (benzene), MTBE was not detected in the ground water <br /> sample collected from MW-3 <br /> Utilizing EPA method 8260, MTBE, DIPE, ETBE, TAME and TBA were not detected in the <br /> laboratory analysis of the ground water sample <br /> The laboratory report (Castle Analytical Laboratory Reference Number 1643 and McCampbell <br /> Analytical Inc Lab I D 91185)and chain-of-custody forms are presented in Appendix B, the results <br /> of the analysis are contained in Table 3 <br /> 4.0. DISCUSSION AND CONCLUSIONS <br />' Based upon data collected during the June 1998 monitoring, AGE concludes <br /> • Ground water was inferred to be flowing generally toward the east at a calculated gradient <br /> Advanced GeoEnvironmental,Inc <br /> I <br />