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t <br />' 01 May 2002 <br /> AGE-NC Project No 98-0540 <br />' Page 2 of 4 <br />' were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br />' Method 8015M, <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br />' (MTBE) in accordance with EPA Method SW846 8020, and <br /> • The oxygenated fuel additives MTBE, tertiary butyl alcohol (TBA), di-isopropyl ether <br /> (DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME), 1,2- <br />' dibromoethane(EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method <br /> SW846 8260B <br />' A ground water sample from the on-site domestic well was also collected and analyzed To ensure <br /> that formation water was being produced,water was allowed to run out of the well for approximately <br /> 15 minutes Ground water was poured directly into the 40-m1 VOA vials from a facet at the well <br />' head <br /> 3.0. FINDINGS <br /> 1 <br /> Ground water elevation and flow direction were deducted from field data, hydrocarbon-impact to <br />' 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 ranged from 73 65 feet to <br /> 73 73 feet below the tops of the well casings Ground water elevations at the site ranged from 16 93 <br />' feet below mean sea level (MSL) in MW-2 to 16 99 feet below MSL in MW-3 The maximum <br /> ground water gradient was calculated to be 0 001 ft/ft, directed toward the south-southeast <br /> 3 2 ANALYTICAL RESULTS OF WATER SAMPLES <br /> TPH-g was detected in the ground water samples collected from MW-1 and MW-3 at concentrations <br /> of 380 micrograms per liter(µg11) and 140 µg/1, respectively <br /> Benzene was detected in ground water samples collected from MW-1 and MW-3 at concentrations <br /> of 2 1 µg/l and 2 2 µg/l,respectively,toluene was detected in the same samples at concentrations of <br /> 17 µg/l and 11 µg/l, respectively, ethylbenzene was detected in the sample from MW-1 at a <br /> Advanced GeoEnviron mental,Inc <br /> i <br />