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20 January 2005 <br /> AGE-NC Project No 98-0540 <br /> Page 2 of 4 <br /> DHS-certified analytical laboratory <br /> The samples were analyzed for the following constituents ` <br /> Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015M, and <br /> I • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and the fuel additives methyl <br /> - tertiary-butyl ether (MTBE), tertiary butyl alcohol (TBA), di-isopropyl ether (DIPE), ethyl <br /> tertiary butyl ether(ETBE), tertiary amyl methyl ether(TAME), 1,2-dibromoethane (EDB) <br /> and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method SW846 8260B <br /> 3.0. FINDINGS ' <br /> IGround water elevation and flow direction were deduced from field data, the hydrocarbon-impact <br /> to ground water was assessed by laboratory analysis of the ground water samples <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> The elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> from the surveyed casing elevations(Table 1) Depths to ground water for the June 2004 monitoring <br /> I event ranged from 78 41 feet to 78 60 feet below the tops of the well casings Ground water <br /> elevations at the site ranged from 21 70 feet below mean sea level'(MSL) in MW-2 to 21 86 feet ' <br /> below MSL in MW-3 The maximum groundwater gradient was calculated to be 0 004 foot/foot <br /> Iwith a flow direction to the east-southeast (Figure 4) <br /> 32 ANALYTICAL RESULTS OF WATER SAMPLES <br /> TPH-g was detected in the ground water sample collected from MW-1 during the June 2004 P - <br /> monitoring event at a concentration of 560 micrograms per liter(µg/1) (Table 2) <br /> BTEX compounds were detected in the sample from MW-1 at concentrations of 5 1 gg/l,benzene, <br /> 22 µg/1 toluene, 10 µg/1 ethylbenzene and 242 µg/l total xylenes <br /> The fuel additive 1,2-DCA was detected in the ground water samples from MW-1 and MW-3 at <br /> concentrations of 12 µg/l and 70 µg/1, respectively No other,target analytes were detected above <br /> laboratory reporting limits from the monitoring event <br /> Advanced GeoEnvironmental,Inc <br /> r <br />