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•, 07 November 2000 <br /> AGE-NC Project No. 98-0520 <br />' Page 2 of 4 <br /> transported under chain-of-custody to McCambell Analytical,Inc.(MAI)The samples were analyzed <br /> fon. <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance,with EPA <br /> Method 5030/8015M; <br /> • Volatile aromatic compounds - benzene, toluene, ethyl benzene and xylene (BTEX) with <br /> methyl tertiary- butyl ether (MTBE) - in accordance with EPA Method 8020; and <br /> 0 Fuel oxygenates,including tertiary butanol(TBA),di-isopropyl ether(DIPE),ethyl tert=butyl <br />' ether (ETBE), tert-amyl methyl ether (TAME), and MTBE, with 1,2-Dichloroethane <br /> (1,2-DCA) in accordance with EPA Method 8260B. <br /> 3.0. FINDINGS <br /> tGround water elevation, and flow direction were calculated from field data;hydrocarbon-impact to <br /> ground water was inferred from laboratory analysis of ground water samples. <br /> 3.1. GROUND WATER ELEVATION AND GRADIENT <br /> 1 <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 /> 20.80 feet to 21.42 feet below the tops of the well casings.Ground water elevations at the site ranged <br /> from 15.55 feet (MW-4)to 15.64 feet (MW-2) above mean sea level. <br /> ' The ground water flow direction was determined using ground water elevation data. The ground <br /> water underlying the site is flowing west to slightly west-southwest under an average gradient of <br /> 0.0009 ft/ft. As such a low gradient, small measurement variations can greatly affect the inferred <br /> flow direction. Figure .3 illustrates the contoured ground water elevations as measured on 07 <br /> September 2000. <br /> 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> e' TPH-g was detected in all the water samples analyzed at concentrations ranging from 680 <br /> micrograms per liter(µg/1) in MW-4 to 9,300 µg/1 in MW-5. <br /> ' . Various BTEX compounds were detected in all of the water samples analyzed. Maximum benzeneal P P Y <br /> and toluene concentrations were detected in the sample from MW-5 at 2.8 }ig/I and 6.8 p.g/1, <br /> ' Advanced CeoEnvironmental,Inc. <br />