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IO5 November 2003 <br /> • AGE-NC Project No 99-0657 _ <br /> IPage 2 of 4 <br /> I Department of Health Services-certified analytical laboratory, for analysis The samples were <br /> analyzed for <br /> I Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Method 8015 Modified, and <br /> • Benzene,toluene,ethylbenzene and total xylenes(BTEX)and the fuel additives di-isopropyl <br /> ether(DIPE),ethyl tertiary-butyl ether(ETBE),methyl tertiary-butyl ether(MTBE),tertiary- <br /> amyl methyl ether(TAME),tertiary butyl alcohol(TBA), 1,2-dichloroethane(1,2-DCA)and <br /> I1,2-dibromoethane (EDB) in accordance with EPA Method 8260B <br /> I3.0 FINDINGS <br /> I Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 07 July 2003 The contaminant impact to groundwater was quantified from the laboratory analytical <br /> data <br /> I � <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> At the time of the July 2003 sampling event,depths to ground water ranged from 35 61 feet to 37 55 <br /> feet below the tops of the well casings The depth to ground water decreased approximately 1 3 5 feet <br /> I between the quarterly monitoring events Ground water elevations at the site ranged from 4 32 feet <br /> above mean sea level(MSL)in well MW-6 to 4 97 feet above MSL in well MW-7(Table 1) During <br /> this monitoring event, the ground water levels in the wells were at least four feet below the tops of <br /> Ithe well screens, indicating that the wells are screened properly to yield representative shallow <br /> ground water samples <br /> IGround water flow was inferred to be flowing towards the southwest with an average hydraulic <br /> gradient of 0 006 feet/feet Figure 3 illustrates the contoured ground water elevations as measured <br /> on 07 July 2003 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in the water samples collected from wells MW-1 through MW-7 at a maximum <br /> concentration of 5,600 micrograms per liter(µg/1) in sample MW-4 TPH-d was not detected at or <br /> . above laboratory detection limits in the ground water samples collected this quarter <br /> Advanced GeoEnvironmental,Inc <br />