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1 <br />' 04 March 2002 <br /> AGE-NC Project No 99-0657 <br /> Page 2 of 4 <br />' 40-m1 VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative After <br /> collection, the samples were properly labeled, placed in a chilled container and transported under <br /> chain-of-custody to McCampbell Analytical Inc (MAI)for analysis The samples were analyzed for <br />' Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Methods 503013550/8015-modified for fuels, <br />' Benzene,toluene,ethylbenzene and xylenes(BTEX)and methyl tertiary-butyl ether(MTBE) <br /> 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 /> • Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 16 January 2002, the contaminant impact to ground water was quantified by laboratory analysis of <br /> the ground water samples <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> At the time of the January 2002 sampling event, depths to ground water ranged from 33 39 feet to <br /> 34 48 feet below the tops of the well casings Ground water elevations at the site ranged from 7 67 <br /> feet above mean sea level (MSL) in well MW4 to 7 96 feet above MSL in well MW2 (Table 1) <br /> During this monitoring event, the ground water levels in the wells were approximately 3 39 to 9 42 <br /> feet below the tops of the well screens, indicating that the wells are screened properly to yield <br /> representative shallow ground water samples The relative ground water elevation at the site <br /> decreased an average of 106 feet between the October 2001 and January 2002 monitoring events <br /> IGround water was inferred to be flowing toward the southwest under an average gradient of <br /> 0 004 feet/feet Figure 3 illustrates the contoured groundwater elevations as measured on 16 January <br /> 2002 <br /> I <br /> • <br /> I <br /> Advanced GeoEnvironmentaf,Inc <br />