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i01 February 2004 <br /> AGE-NC Project No 99-0637 <br /> iPage 2 of 4 <br /> i Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Method 8015-modified, <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and in accordance with EPA <br /> iMethod 8 02 1, and <br /> • Fuel additives including methyl tertiary-butyl ether(MTBE),di-isopropyl ether(RIPE), ethyl <br /> i tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), <br /> ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA <br /> Method 8260B <br /> I <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 17 November 2003 The MTBE-impact to groundwater was quantified from the laboratory analysis <br /> of the ground water samples <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> I At the time of the November 2003 sampling event, depths to ground water ranged from 21 18 feet <br /> to 23 03 feet below the tops of the well casings Ground water elevations at the site ranged from <br /> 11 02 feet above mean sea level (MSL) in well MW9 to 11 49 feet above MSL in well MW2 <br /> (Table 1) During this monitoring event,the ground water levels in the wells were at least eleven feet <br /> below the tops of the well screens, indicating that the wells are screened properly to yield <br /> representative shallow ground water samples <br /> IGround water flow was inferred to be flowing toward the west to northwest, away from the former <br /> UST area at an average gradient of 0 004 feet/feet Figure 3 illustrates the contoured ground water <br /> Ielevations as measured on 17 November 2003 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g, TPH-d, BTEX and the fuel oxygenates, with the exception of MTBE, were not detected in <br /> any of the ground water samples <br /> MTBE was detected in the ground water samples collected from wells MW 1,MW4 through MW7, <br /> and MW9 at concentrations ranging from 0 74 µg/1 in well MW7 to 980 µg/1 in well MW5 An <br /> Iso-concentration reap depicting the approximate distribution of dissolved MTBE is presented in <br /> Figure 4 <br /> Advanced GeoEnvironmental,Inc <br /> i <br />