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15 January 2002 <br /> AGE-NC Project No 98-0540 <br /> Page 2 of 4 <br /> water sample was transferred into laboratory-supplied 40-nl. VOA vials containing 0 5 ml 18% <br /> hydrochloric acid as a sample preservative After collection, the samples were properly labeled, <br /> placed m a chilled container and transported under cham-of-custody to McCampbell Analytical Inc <br /> (MAI) m Pacheco, California, and were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Methods 5030/8015rn4 <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl. tertiary-butyl ether <br /> (MTBE) in accordance with EPA Method 60218020, and <br /> • Oxygenated fuel additives - MTBE,tertiary butyl alcohol(TBA), dr-isopropyl ether(DIPS), <br /> I ethyl tertiary butyl ether(ETBE), and tertiary amyl methyl ether(TAME)in accordance with <br /> EPA Method 8260-Modified <br /> 3.0. FINDINGS <br /> • Ground water elevation and flow direction were deducted from field data, hydrocarbon-Impact to <br /> ground water was assessed by 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 75 42 feet to <br /> 75 56 feet below the tops of the well casings Ground water elevations at the site ranged from 18 70 <br /> feet below mean sea level (MSL) in MW-2 to'18 82 feet below MSL In MW-3 The maximum <br /> ground water gradient was calculated to be 0 002 ft/ft, directed toward the south-southeast <br /> I <br /> 32 ANALYTICAL RESULTS OF WATER SAMPLES <br /> TPH-g was detected In the groundwater samples collected from MW-1 and MW-3 at concentrations <br /> of 430 micrograms per liter(µg/1) and 270 µg/l,\respectively <br /> Benzene was detected inound water samples collected from MW-1 and M3 at concentrations <br /> €n' P W <br /> of 0 67 µg/1 and 3 3 µg/1, respectively, toluene was detected in the same samples at concentrations <br /> iof 2 9 4g/l and 1 2 µg/l, respectively, ethylbenzene was detected in the samples from MW-1 and <br /> . MW-3 at concentrations of 9 4 µg/1 and 5 3 µg/,1,respectively, and total xylenes were detected In the <br /> Advanced GeoEnvlronmental,Inc <br />