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17 August 2001 <br /> AGE-NC Project No 99-0637 <br />' Page 2 of 3 <br />' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Methods 50301355018015-modified for fuels, <br />' • Volatile aromatic compounds - benzene, toluene, ethylbenzene and xylenes (BTEX) and <br /> methyl tertiary-butyl ether (MTBE) in accordance with EPA Method 8020, <br />' • Volatile organic compounds and fuel oxygenates - MTBE, di-isopropyl ether(DIPE), ethyl <br /> tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), <br /> 1,2-dichloroethane (1,2-DCA) and ethylene dibromide (EDB) in accordance with EPA <br />' Method 8260 Modified <br /> 3.0. FINDINGS <br /> I Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 11 July 2001,the contaminant impact to ground water was assessed by the laboratory analytical data <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> I At the time of the July 2001 sampling event, depths to ground water in wells MW 1 through MW4 <br /> ranged from 17 40 feet to 18 07 feet below the well heads Ground water elevations at the site ranged <br /> from 16 40 feet above mean sea level(MSL) in well MW4 to 16 51 feet above MSL in well MW3 <br /> During this monitoring event, the depths to ground water in the wells were approximately 7 40 to <br /> 8 07 feet below the tops of the well screens,indicating that the wells are screened properly and yield <br /> representative shallow ground water samples The relative ground water elevations decreased an <br /> average 2 04 feet between the April 2001 and July 2001 monitoring events <br /> I The ground water flow direction was determined using ground water elevation data from the <br /> monitoring wells on-site The flow direction was inferred to be generally toward the west,under an <br /> average hydraulic gradient of 0 0005 feet/feet Figure 3 illustrates the contoured ground water <br /> elevations as measured on 11 July 2001 <br /> I3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> MTBE was detected by EPA Method 8020 in the ground water sample collected from MW4 at a <br /> concentration of 10,000 µg/1 and confirmed by EPA Method 8260 at a concentration of 12,000 µg/1 <br /> No other analytes were detected at or above laboratory reporting limits in the ground water samples <br /> analyzed <br /> Advanced GeoEnviron mental,Inc <br />