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1 <br /> 1 03 March 2005 <br /> M AGE-NC Project No 98-0452 <br /> 1 Page 4 of 6 <br /> to 0 92 feet(MW-3) above mean sea level (MSL) Ground water flow was radially inward towards <br /> 1 a west-northwest-trending,trough in the potentiometric surface (Figure 5), ground water gradients <br /> ranged between 0 004 ft/ft near the former UST location and 0 003 ft/ft near the AST locations <br /> Average depth to ground water was 5 27 feet below the tops of the well casings and rose an average <br /> of 0 27 foot between the September and December 2004 monitoring events <br /> 32 ANALYTICAL RESULTS 4F WATER SAMPLES <br /> Laboratory analytical results of water samples from the second,third and fourth quarter monitoring <br /> events are provided below <br /> 1 3 2 1 Second Quarter(28 June 2004) <br /> TPH-g was detected in the samples from wells MW-2, MW-4 and MW-5 at concentrations of <br /> 400 micrograms per liter(µg/1),560µg11 and 190µg/l,respectively Ethylbenzene and xylenes were <br /> detected at concentrations of 25 µg11 and 40 µg/1, respectively from sample MW-4 MTBE was <br /> 1 • detected In samples MW-2 through MW-5 at concentrations of 390 µg/1, 14 µg/1, 75 µg/l and 190 <br /> µg/l, respectively TAME was detected in the sample from MW-2 at a concentration of 3 4 µg/1 <br /> Figure 6 shows the approximate hydrocarbon-impact to ground water for the June monitoring event <br /> 1 <br /> 1 3 2 2 Third Quarter(30 September 2004) <br /> TPH-g was detected at concentrations of 110 µg/1, 820 µg/1 and 120 µg/1 in samples MW-2, MW-4 <br /> 1 and MW-5,respectively Ethylbenzene and xylenes were detected in sample MW-4 at concentrations <br /> of 5 4 µg/1 and 11 5 µg11, respectively MTBE was detected In samples MW-2 through MW-5 at <br /> concentrations of 110 µg/1, 11 µg/1, 310 µg/1 and 120 µg/1 respectively Figure 7 shows the <br /> 1 approximate hydrocarbon-impact to ground water for the September monitoring event <br /> 1 3 2 3 Fourth Quarter (16 December 2004) <br /> TPH-g was detected at concentrations of 1,700 µg/l and 150 µg/1 in samples MW-4 and MW-5, <br /> 1 respectively Ethylbenzene and xylenes were detected in sample MW-4 at concentrations of 5 2 µg/1 <br /> and 2 3 µg/1,respectively MTBE was detected in samples MW-2 through MW-5 at concentrations <br /> of 21 µg11,5 7µg/1,38 µg/1 and 150µg/l,respectively Figure 8 shows the approximate hydrocarbon- <br /> impact to ground water for the December monitoring event <br /> • <br /> 1 Advanced GeoEnvironmental,Inc <br /> 1 <br />