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' 26 October 2000 S AGE-NC Project No 97-0290 ' Page 2 of 4 ' preservative After collection, the samples were properly labeled, placed in a chilled container and transported under chain-of-custody to Alpha Analytical Laboratories (AAL) and were analyzed for ' • Total petroleum hydrocarbons as gasoline and diesel (TPH-g and TPH-d) in accordance with EPA Methods 8015 Modified, • Volatile aromatics benzene, toluene, ethylbenzene and xylene (BTEX) in accordance with ' EPA Method 8020, • Oxygenated compounds di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), ' MTBE, tertiary-amyl methyl ether (TAME) and tertiary butanol (TBA) in accordance with 8260 Modified 1 3.0. FINDINGS ' Ground water flow direction and gradient were inferred from data collected in the field, ground water levels were within the screen interval of the wells on the site The hydrocarbon Impact to ground ' water was quantified by the laboratory data obtained from the ground water samples 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION The depths to ground water ranged from 43 90 feet to 45 88 feet below the tops of the well casings on 28 August 2000 Ground water elevations ranged from 2 95 to 3 94 feet above mean sea level (MSL) Ground water elevation decreased an average of 1 2 feet over the last quarter Ground water data is summarized on Table 1 ' Theround water flow r g o direction was southerly with a gradient of 0 002 ft/ft The gradient of the ground water appears to decrease at the southern edge of the site Ground water elevation contours based upon the data for the August 2000 monitoring event are illustrated on Figure 3 3 2 ANALYTICAL RESULTS OF WATER SAMPLES I TPH-g was detected In water samples collected from wells MW-1 MW-2, MW-4, MW-6 and MW-7 at concentrations of 91 micrograms per liter (4g11), 37,000 ,ug/l, 6,300 4gll, 62 ,ug/1 and 100 µg/l, respectively TPH-d was detected In samples collected from wells MW-2, MW-4 and MW-7 at concentrations of 640 Mcg/l, 2,000 µg/l and 58 ,ug/l, respectively • BTEX compounds were detected in ground water samples collected from wells MW-1, MW-2, IAdvanced GeoEnvironmental,Inc