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r <br /> f <br /> 26 February 2001 <br /> AGE-NC Project No 95-0137 <br />' Page 2 of 4 <br /> r <br /> r2 2 GROUND WATER SAMPLE COLLECTION <br /> After purging and allowing a minimum 80%recharge recovery of the initial water level in each well, <br /> samples were collected using new, clean,disposable plastic bailers Each sample was transferred into <br /> three 40-m1 EPA-approved volatile organic analysis (VOA) vials and into one 1-liter amber bottles <br /> Samples were stored in a chilled container and transported under chain-of-custody to McCampbell <br /> rAnalytical Laboi atories (MAI), a state-certified laboratory <br /> Each sample was analyzed in accordance with the following <br /> r • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Method 8015 Modified, <br /> • Volatile aromatic hydrocarbons benzene,toluene, ethylbenzene and total xylenes(BTE&X) <br /> and methyl tertiary butyl ether(MTBE) in accordance with EPA Method 8020, <br /> • Oxygenating fuel additives tertiary butyl alcohol(TBA), di-isopropyl ether(DIPS), methyl- <br /> butyl tertiary butyl ether(MTBE),ethyl tertiary butyl ether(ETBE) and tertiary amyl methyl <br /> ether {TAME) in accordance with EPA Method 8260 Modified <br />' 3.0 FINDINGS <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> rThe elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> from the surveyed well casing elevations (Table 1) <br />' <br /> Depths to ground water ranged from 18 35 to 19 40 feet below the well casing tops The relative <br /> ground water elevations at the site ranged from 79 42 feet to 80 20 feet There was an average <br /> ' decrease of the relative ground water elevation at the site of 0 29 feet over the last quarter <br /> ' The ground water flow ranges from northwest to northeast (Figure 3) Historically, ground water <br /> flow direction at the site has varied from north to northwest The hydraulic gradient was calculated <br /> to be 0 007 feet/feet <br /> r <br /> 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in all samples,excluding sample MW-5,at concentrations ranging from 210 gg/l <br /> in sample MW-4 to 76,000 µg/l in VW-1B TPH-d was detected in all samples at concentrations <br /> rAdvanced GeoEnvironmentdl,Im <br /> r <br />