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IA R <br /> 10 December 2001 <br /> • AGE-NC I Project No 98-0540 <br /> Page 2 of 4 <br /> Iwater sample was transferred into laboratory-supplied 40-m1 VOA vials containing 0 5 ml 18% <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 McCampbell Analytical Inc <br /> (MAI) in Pacheco, California, and were analyzed for <br /> Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Methods 5030/8015m, <br /> Volatile aromatic hydrocarbons - benzene, toluene, ethylbenzene and total xylenes (BTEX) <br />' and methyl tertiary-butyl ether (MTBE) in accordance with EPA Method 60218020, and <br /> Oxygenated fuel additives -MTBE,tertiary butyl alcohol(TBA), di-isopropyl ether(DIPS), <br /> ethyl tertiary butyl ether(ETRE), and tertiary amyl methyl ether(TAiIIE) m accordance with <br /> EPA Method 8260-Modified <br /> 3.0. FINDINGS <br /> IGround 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 m 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 74 42 feet to <br /> 74 68 feet below the tops of the well casings Ground water elevations at the site ranged from 17 70 <br /> feet below mean sea level (MSL) in MW-2 to 17 94 feet below MSL in MW-3 The maximum <br /> ground water gradient was calculated to be 0 005 ft/ft directed southeast <br /> 1 <br /> w 3 2 ANALYTICAL RESULTS OF WATER SAMPLES - <br /> TPH-g was detected in the ground water samples collected from MW-1 and MW-3 at concentrations <br /> of 390 micrograms per liter (µg11) and 84 µg11, respectively <br /> Benzene was detected mound water les collected from MW-1 and M3 at concentrations <br /> �' samples W <br /> of 14 µg/1 and 0 75 µg/l, respectively, toluene was detected in the samples from MW-1 and MW-3 <br /> at concentrations of 4 0 µg/l and 3 8 µg11,respectively, ethylbenzene was detected in the sample from <br /> MW-1 at a concentration of 13 µg/l and total xylenes were detected in samples collected from MW-1 <br /> I ` <br /> Advanced GeoEnviroumental,Inc <br /> I <br />