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l <br /> xl <br />. 17 July 2000 <br /> AGE-NC Project No 98-0511 <br /> Page 2of3 <br /> hydrochloric acid as a sample preservative After collection, the samples were properly labeled, <br /> placed in a chilled container and transported under chain-of-custody to Alpha Analytical <br /> Laboratories, Inc and to Kiff Analytical, Inc and were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Methods GCFID/5030, <br /> • Volatile aromatic hydrocarbons benzene, toluene, ethylbenzene and total xylenes (BTEX) <br /> with methyl tertiary-butyl ether(MTBE) in accordance with EPA Method 602/8020, and <br /> • Fuel oxygenates di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, <br /> tertiary-amyl methyl ether (TAME) and tertiary butanol (TBA) in accordance with EPA <br /> Method 8260B <br /> 3.0. FINDINGS <br /> Ground water elevation and flow direction were calculated from field data, hydrocarbon-impact to <br />. ground water was Inferred from laboratory analysis of the ground water samples <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> The elevation of ground water In each well was calculated by subtracting the depth to ground water <br /> from the surveyed casing elevations (Table 1) Depths to ground water ranged from 10 80 feet to <br /> 11 18 feet below the tops of the well casings Ground water elevations at the site ranged from 7 08 <br /> feet In MW-3 to 7 44 In MW-2 relative to mean sea level The ground water gradient was calculated <br /> to be 0 004 ft/ft directed N 75' W <br /> 32 ANALYTICAL RESULTS OF WATER SAMPLES <br /> TPH-g and BTEX compounds were detected in the ground water samples collected from MW-1 at <br /> concentrations of 6,100 parts per billion(ppb, reported as micrograms per liter), 540 ppb, 480 ppb, <br /> 120 ppb and 720 ppb, respectively <br /> MTBE was detected by EPA Method 8260B in the ground water sample collected from MW-I at <br /> a concentration of 14 ppb No other fuel oxygenated compounds were detected above laboratory <br /> reporting limits <br /> Analytical results of ground water samples are summarized on Table 2 The laboratory report (Alpha <br /> Advanced GeoEnvironmental,Inc <br />