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rr , <br />' 25 April 2002 <br /> AGE-NC Project No. 97-0343 <br />' Page 2 of 4 <br />' chain-of-custody to McCampbell Analytical, Inc. (MAI) a Department of Health Services <br /> (DHS)-certified laboratory. The ground water samples were analyzed for: <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in <br />' accordance with EPA Methods 5030/8415 Modified and 3550/8015 Modified,respectively; <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl-tertiary butyl ether <br /> (MTBE) in accordance with EPA Method 60218020; and <br />' • The fuel additives 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 8260 Modified. <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 12 February 2002; 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 February 2002 sampling event, depths to ground water in wells MW1 through <br /> MW7 ranged from 52.13 feet to 53.42 feet below the well heads. Ground water elevations at the site <br /> ranged from 27.23 feet below mean sea level(MSL)in well MW3 to 27.46 feet below MSL in well <br /> MW7 (Table 1). Ground water elevations at the site increased an average 3.45 feet since the fourth <br /> quarter 2001 monitoring event. <br /> Based on the elevation contours,the shape of the ground water table was in the form of a northwest- <br /> trending nose.The groundwater flow direction was inferred to be flowing generally to the northwest <br /> Iat an average hydraulic gradient of 0.003 feet/feet. Figure 3 illustrates the contoured ground water <br /> elevations as measured on 12 February 2002. <br /> r <br /> 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in ground water samples collected from MW1, MW2 and MW3 at <br /> concentrations of 34,000 µg/1, 15,000 µg/l, and 1,700 µg/I, respectively. TPH-d was detected in <br /> I ground water samples collected from monitoring wells MW 1,MW2 and MW3 at concentrations of <br /> 1,700 µg/l, 2,000 µg/1 and 220 µg/l, respectively. <br /> Advanced GeoEnvironmental,Inc. <br /> I <br />