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' 15 November 2000 <br /> AGE-NC Project No 98-0540 <br /> Page 2 of 4 <br /> 1 _ <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 (AAL) in Ukiah, California, and were analyzed for <br /> ta 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 602/8020, and <br />' • Oxygenated fuel additives MTBE,tertiary butyl alcohol (TBA), di-isopropyl ether(DIPE), <br /> ethyl tertiary butyl ether(ETBE), and tertiary amyl methyl ether(TAME)in accordance with <br /> EPA Method 8260-Modified <br /> I3.0. FINDINGS <br /> Ground water elevation and flow direction were deducted from field data, hydrocarbon-impact to <br /> Mground water was assessed by laboratory analysis of the ground water samples <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> The relative elevation of ground water in each well was calculated by subtracting the depth to ground <br /> water from the surveyed relative casing elevations (Table 1) Depths to ground water ranged from <br /> 74 86 feet to 75 12 feet below the tops of the well casings Ground water elevations at the site ranged <br /> from 18 14 feet below mean sea level (MSL) in MW-1 to 18 38 feet below MSL in MW-3 The <br />' ground water gradient was calculated to be 0 005 ft/ft directed S 44° E <br /> I32 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 160 micrograms per liter(µg/1) and 200 µg/l, respectively <br /> I Benzene was detected in ground water samples collected from MW-1 and MW-3 at concentrations <br /> of 2 7 µg/1 and 3 8 µg/l, respectively, Toluene was detected in the sample from MW-3 at 3 5 µg/1, <br /> and total xylenes were detected in samples collected from MW-1 and MW-3 at concentrations of 8 3 <br /> I µg/1 and 14 µg11, respectively <br /> Advanced GcoEnvironmental,Inc <br /> I <br />