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' 22 March 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), dl-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <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 /> 3.0. FINDINGS <br />' Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 14 February 2005 The contaminant impact to ground water was quantified from the laboratory <br />' analytical data <br />' . 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br />' At the time of the February 2005 sampling event, depths to ground water ranged from 30 52 feet <br /> (MW-3)to 31 04 feet(MW-1)below the tops of the well casings Ground water elevation averaged <br /> approximately 19 70 feet below mean sea level (MSL), a increase of 2 11 feet since the last <br /> monitoring event in November 2004(Table 1) During this monitoring event,the ground water levels <br /> in the wells were at least 5 52 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 to northeast under a hydraulic gradient of <br /> 0 016 foot per foot(ft/ft) Figure 3 illustrates the contoured ground water elevations as measured on <br />' 14 February 2005 <br /> 32 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 640,000 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 47,000 µg/1 benzene, 120,000 gg/l toluene, 39,000 µg/1 <br /> Advanced GeoEnvironmentel,Inc <br />