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'l 7 August 2000 <br /> • AGE-NC Project No. 98-0520 <br /> Page 2 of 4 <br /> 1 <br /> transported under chain-of-custody to McCambell Analytical,Inc.(MAI)The samples were analyzed <br /> ' for: <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> ' Method-5030/8015M; <br /> Volatile aromatics(benzene,toluene, ethyl benzene and xylene:.BTEX)with methyl tertiary- <br /> butyl ether (MTBE) in accordance with EPA Method 8020; and <br /> • Fuel oxygenates,including tertiary butanol(TBA),di-isopropyl ether(RIPE),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 8260$. <br /> ' 3.0. FINDINGS <br /> Ground 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 /> 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 /> 16.65 feet-to 17.42 feet below the tops of the well-casings. Ground water elevations ai-the site ranged <br /> ' from 19.61 feet (MW-3) to 19.70 feet (MW-4) 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 to the northwest under an average gradient of 0.0009 ft/fl. Figure <br /> 3 illustrates the contoured ground water elevations as measured on 17 May 2000. <br /> 1 <br /> 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in all the water samples analyzed at concentrations ranging from 930 <br /> micrograms per liter (,t)g/1) in MW-4 to 20,000 kgll in MW-5. <br /> Various BTEX compounds were detected in all of the water samples analyzed. Maximum benzene <br /> and toluene concentrations were detected in the sample from MW-3 at 2.4 µg/1 and 2.2. µg11, <br /> 1 respectively. Maximum ethylbenzene and xylene concentrations were detected in the sample from <br /> MW-5 at 1,600 pg/l and 1,900 i4l, respectively. <br /> Advanced GcoEnviron mental,Inc. <br />