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' 25 August 2005 <br /> AGE-NC Project No 01-0815 <br />' Page 2 of 4 <br /> Services (DHS)-certified analytical laboratory, for analysis The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br />' Method 8015M, and <br /> • Benzene, toluene, ethylbenzene, and total xylenes (BTEX) and the fuel additives methyl <br /> tertiary-butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETRE), <br /> tertiary-amyl methyl ether(TAME),tertiary butanol (TBA), ethylene dibromide(EDB)and <br /> 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B <br /> 1 <br /> 3.0. FINDINGS <br />' Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 17 May 2005 The contaminant impact to groundwater was quantified from the laboratory analytical <br /> data <br /> r3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br />' At the time of the May 2005 sampling event,depths to ground water ranged from 28 00 feet(MW-2) <br /> to 28 80 feet (MW-3) below the tops of the well casings Ground water elevation averaged <br /> approximately 17 32 feet below mean sea level (MSL), a increase of 2 45 feet since the last <br /> monitoring event in February 2005 (Table 1) During this monitoring event,the ground water levels <br /> in the wells were at least 3 feet below the tops of the well screens, indicating that the wells are <br /> screened properly to yield representative shallow ground water samples <br />' Ground water was inferred to be flowing towards the east-northeast under a hydraulic gradient of <br /> 0 0016 foot per foot (ft/ft) Figure 3 illustrates the contoured ground water elevations as measured <br />' on 17 May 2005 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in ground water samples collected from wells MW-1 through MW-3 at a <br />' maximum concentration of 3,800,000 micrograms per liter(µg/1) in the sample collected from well <br /> MW-3 <br />' BTEX compounds were detected in ground water samples collected from wells MW-1 through <br /> MW-3 at maximum concentrations of 38,000 µg/1 benzene, 370,000 µ.g/1 toluene, 460,000 Pg/l <br />' Advanced GeoEnvironmenta[,Inc <br /> I <br />