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15 March 2005 <br /> AGE-NC ProlectNo 01-0815 <br /> Page 2 of 4 <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 (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 /> 117 November 2004 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 November 2004 sampling event, depths to ground water ranged from 32 43 feet <br /> (MW-2)to 33 32 feet(MW-3)below the tops of the well casings Ground water elevation averaged <br />' approximately 21 81 feet below mean sea level (MSL), a decrease of 0 98 feet since the last <br /> monitoring event in August 2004 (Table 1) During this monitoring event, the ground water levels <br /> in the wells were at least 7 8 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 southeast under a hydraulic gradient of <br />' 0 003 foot per foot(ft/ft) Figure 3 illustrates the contoured ground water elevations as measured on <br /> 17 November 2004 <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 200,000 micrograms per liter (µg/l) in the sample collected from well <br /> MW-1 ' <br />' BTEX compounds were detected in ground water samples collected from wells MW-1 through <br /> MW-3 at maximum concentrations of 21,000 µg/1 benzene in well MW-1 and 15,000 µg/l toluene, <br />' 3,000 µg/l ethylbenzene, and 20,500 µg11 total xylenes in well MW-3 <br /> Advanced GeoEnvvonmental,Inc <br />