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24 October 2005 <br /> AGE-NC Project No. 98-0500 <br /> Page 9 of 11 <br /> between 40.16 feet(MW-48)and 40.62 feet(MW-44)below MSL.Ground water flow direction was <br /> west from the former UST dispenser area towards well MW-36 at a gradient of 0.002 ft/ft The <br /> ground water elevation map is depicted in Figure 5. <br /> Ground water elevation in the wells screened across the water table decreased greater than 7.3 feet <br /> between the June and August 2005 ground water monitoring events (Table 3). This decrease in <br /> ground water elevation may signal decline in the ground water recharge in the area during the later <br /> portion of year. <br /> 4.3.2. Laboratory Results of Ground Water Samples <br /> A total of 43 ground water samples collected from monitoring wells were submitted for laboratory <br /> analysis: <br /> HU 1 - Water table 60 feet <br /> TPH-g was detected in shallow wells at concentrations ranging from 500µg/l in well MW-3, 800µg/l <br /> Min well MW-8, 30,000µg/l in well MW-1 and up to 39,000 µg/l in well MW-2; TPH-stoddard was <br /> not detected in the shallow ground water samples; and TPH-d was detected in well MW-1, MW-2 <br /> at concentrations of 52,000 µg/l and 34,000 gg/l, respectively. <br /> Various BTEX compounds were detected in shallow wells at maximum concentrations of <br /> 11,000 µg/l benzene, 7,000 gg/1 toluene, 1,100 gg/1 ethylbenzene and 13,300 µg/l xylenes in well <br /> MW-1.The fuel additive 1,2-DCA was detected in samples at a maximum concentration of 110µg/1 <br /> (MW-1) and in addition EDB was detected in well MW-1 at 63 gg/l. <br /> HU3/HU4 - 100 feet <br /> TPH-g was detected in intermediate wells at concentrations of 100µg/1 in well MW-26, 300 µg/1 in <br /> well MW-25 and 1,000µg/l in well MW-47. BTEX compounds were detected in samples analyzed <br /> from well MW-47 at concentrations of 2.1µg/1 toluene, 2.4 gg/1 ethylbenzene and 90 gg/1 xylenes. <br /> TPH-d and TPH-stoddard were not detected in HU3/4 ground water samples. <br /> In addition,the fuel additive 1,2-DCA was detected in samples MW-24,MW-25,MW-26,MW-30, <br /> MW-40, MW-46 and MW-47 at a maximum concentration of 150 gg/1 (MW-26). <br /> Advanced GeoEnvironmental,Inc. <br />