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r -�= ' 07 May 2004 AGE-NC Project No 98-0534 Page 8of14 ' Ground water monitoring well MW-2 was not readily accessible or located during the sampling event Ground water levels ranged from 11 91 to 13 46 feet below the tops of the well casings (top of the screened interval), ground water flow direction at the site was ' inferred to be relatively flat in the area of the former UST, trending towards a steeper northwest-onented depression at the northern portion of the site, in the area of well MW-4 The gradient ranged from essentially flat at the former UST area to 0 04 fl/ft at the northern edge of the site TPH-d was detected in the ground water samples collected from wells MW- 4,MW-6 and MW-7 at concentrations of 140µg/1, 130µg/l and 60 lig/l,respectively TPH-g and BTEX compounds were not detected in the ground water samples analyzed MTBE was detected by EPA Method 8260 in the samples fromjwells MW-3,MW-4,MW-6,MW-7 and MW-8 at concentrations of 10 pg/l, 16 µg/1, 140 µg/1, 0 77 µg/1 and 1 2 µg/1, respectively TBA was detected in sample MW-4 at 16 µg/1 No other fuel oxygenates were detected in ' the samples analyzed Ground water elevations are summarized in Table 1,analytical results of ground water samples are summarized in Table 2 Results of the October 2002 ground water monitonng event were reported in Quarterly Report - 4th Quarter 2002, dated 02 ' December 2002, prepared by AGE • 23 January 2003-ground water levels were measured at MW-1 and MW-3 through MW-8 Ground water monitoring well MW-2 was not readily accessible during the sampling event 10 Ground water levels averaged 8 5 feet below the tops of the well casings(above the screened interval) A ground water ridge was present in the area of the former UST with ground water flowing towards the northeast away from the former UST area, with a gradient of approximately 0 0063 feet/feet and towards the southwest away from the former UST area to 0 0052 feet/feet The ground water elevation of monitoring wells MW-4 and MW-5 appeared anomalously low and further failed to recharge after purging, therefore the data from these wells was not used to map the ground water elevation TPH-d was not detected in the any of the ground water samples TPH-g was detected in the ground water samples collected from wells MW4 and MW6 at concentrations of 160 µg/l and 110 µg/1, respectively BTEX compounds were' not detected in any of the groundter,.sample""s � MTBE was detected in samples MW4 and MW6 by EPA method 8021B at�ug/l and Lir yin, 16a ug/1 and were reconfirmed with EPA method 8260B at 19 ug/l and 18 ug/l, respectively No �1tiy� other fuel oxygenates were detected inanof the samples ,Ground water elevations are summarized in Table 1, analytical results of ground water samples are summarized in Table 2 Results of the January 2003 ground water monitoring event were reported in Quarterly Report - 1st Quarter 2003, dated 15 March 2003, prepared by AGE • 03 March 2003-a representative of AGE performed a reconnaissance of visually observable poteritial receptors within a 2,000-foot radius of the above referenced site Water wells or other observable potential receptors were located during the reconnaissance Results of the March 2003 investigation are presented in Appendix C r . 31 October 2003-ground water levels measured at MW-1 through MW-8 averaged 12 5 feet � Advanced CeoEnvironmental,Inc