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1 <br /> 1 21 December 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 5030/3550/8015-modified for fuels, <br /> • Benzene,toluene,ethylbenzene and xylenes(BTEX)in accordance with EPA Method 8020, <br /> I • Fuel additives-methyl tertiary-butyl ether(MTBE),di-isopropyl ether(DIPE),ethyl tertiary- <br /> butyl ether (ETBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), <br />' 1,2-dfchloroethane (1,2-DCA) and ethylene dibromide (EDB) in accordance with EPA <br /> Method 8260 Modified <br /> 3.0. FINDINGS <br />' Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 18 October 2001,the contaminant impact to ground water was assessed by the laboratory analytical <br /> data <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> At the time of the October 2001 sampling event, depths to ground water in wells MW 1 through <br /> MW4 ranged from 19 43 feet to 20 17 feet below the well heads Ground water elevations at the site <br /> ranged from 14 34 feet above mean sea level(MSL)in well MW2 to 14 37 feet above MSL in wells <br /> MW1 and MW4 During this monitoring event, the depths to ground water in the wells were <br /> approximately 9 43 to 10 17 feet below the tops of the well screens, indicating that the wells are <br /> screened properly to yield representative shallow ground water samples The relative ground water <br /> elevations decreased an average 2 10 feet between the July 2001 and October 2001 monitoring <br /> events <br /> 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 toward the southeast under an <br /> average gradient of 0 0004 feet/feet Figure 3 illustrates the contoured ground water elevations as <br /> Imeasured on 18 October 2001 <br /> 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> MTBE was detected by EPA Method 8260 in the ground water sample collected from MW4 at a <br /> concentration of 4,300 p.g/l No other analytes were detected at or above laboratory reporting limits <br /> in the ground water samples analyzed <br /> IAdvanced GeoEnvironmental,Inc <br />