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1 , 13 October 2000 fir, <br /> AGE-NC Project No 96-0263 <br /> IPage 2 of 4 00 <br /> water sample was transferred into 40-m1 VOA vials containing 0 5 ml 18% hydrochloric acid as a <br /> sample preservative After collection, the samples were properly labeled, placed in a chilled <br /> container and transported under chain-of-custody to McCampbell Analytical Inc (MAI) <br /> The samples were analyzed for the following parameters <br /> ITotal petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, <br /> • Volatile aromatic hydrocarbons benzene, toluene, ethylbenzene and total xylenes (BTEX) <br /> with methyl tertiary-butyl ether(MTBE) in accordance with EPA Method 8020, and <br /> I Oxygenated compounds di-isopropyl ether(DIPE),ethyl tertiary-butyl ether(ETBE),methyl <br /> tertiary-butyl ether(MTBE),tertiary-amyl methyl ether(TAME) and tertiary butanol (TBA) <br /> in accordance with 8260-Modified, respectively <br /> I <br />( � 3.0. FINDINGS <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> IThe elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> from the surveyed well casing elevations (Table 1) For the September 2000 sampling event, depths <br /> to ground water ranged from 6 76 feet to 7 77 feet below the tops of the well casings Ground water <br /> elevations at the site ranged from 29 36 feet in well MW-8 to 29 79 in well MWI <br /> The ground water flow direction was calculated using ground water elevation data The ground water <br /> at the site is flowing to the north with an average gradient of 0 004 feet/feet or 21 feet per mile The <br /> ground water contours are depicted on Figure 3 <br /> I <br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in the water samples collected from momtoring wells MW-2, MW-4, MW-5 <br /> and MW-7 at concentrations ranging from 370 micrograms per liter(µg/1) in MW-4 to 20,000 AZg/l <br /> in MW-2 <br /> BTE&X compounds were detected in the water samples collected from monitoring wells MW-2, <br /> MW-4, MW-5, MW-7 and MW-8 Benzene concentrations ranged from 2 5 gg/l in MW-8 to 700 <br /> µg/1 in MW-2 Toluene, ethylbenzene and xylenes were also detected in these wells, with the <br /> I <br /> Advanced GeoEnvironmentai,Inc <br /> I <br />