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27 January 2006 <br /> AGE-NC Project No 98-0500 <br /> Page 7 of 10 <br /> HU6 - Water table 150 feet <br /> Depths to ground water for deep-screened wells MW-34, MW-36, MW-39, MW-42, MW-44, <br /> MW-46, and MW-48 (screened from 140 feet to 150 feet bsg)ranged from 47 98 feet to 49 21 feet <br /> below the tops of the well casings Groundwater elevations were calculated to be between 31 69 feet <br /> (MW-39) and 31 94 feet (MW-44 and MW-34 at the UST location) below MSL <br /> Groundwater flow direction was southeast from the former UST dispenser area toward well MW-48 <br /> at a gradient of 0 001 ft/ft The ground water elevation map is depicted on Figure 5 <br /> Ground water elevation in the wells screened across the water table increased more than 6 6 feet <br /> between the August and December 2005 ground water monitoring events (Table 3) This increase <br /> in ground water elevation may signal a recharge of the ground water in the area during the start of <br /> winter or later portion of year <br /> 3 3 2 Laboratory Results of Ground Water Samples <br /> . A total of 47 ground water samples collected from monitoring wells were submitted for laboratory <br /> analysis <br /> HU1 - Water table 60 feet <br /> TPH-g was detected in shallow wells at concentrations ranging from 14,00 µg/1 in well MW-5, <br /> 2,200 µg/l in well MW-8, 59,000 µg11 in well MW-1, and up to 41,000 µg/l in well MW-2, TPH-d <br /> was detected at maximum concentrations in wells MW-1 and MW-2 of 36,000lig/l and 30,000 µg/l, <br /> respectively, TPH-stoddard was not detected in the shallow ground water samples <br /> Various BTEX compounds were detected in shallow wells at maximum concentrations of <br /> 17,000µg/1 benzene, 11,000 µg/l toluene, 1,400 µg/1 ethylbenzene,and 10,100 µg/l xylenes in well <br /> MW-I The fuel additive 1,2-DCA was detected in samples at a maximum concentration of 340µg/l <br /> (MW-1) <br /> Monitoring well MW-16 was the only well west of the building with significant contamination <br /> TPH-g and TPH-d were detected at concentrations of 34,000 Eig/1 and 68,000 µg/l, respectively, <br /> BTEX compounds were detected at 17 µg/l benzene, 8 1 µg/1 toluene, 44 µg/1 ethylbenzene, and <br /> 408 µg/1 xylenes,the fuel additive 1,2-DCA was detected at 13 µg/1 A map depicting the estimated <br /> distribution of dissolved 1,2-DCA in HU1 is illustrated on Figure 6 <br /> Advanced GeoEnvironmentai,Inc <br />