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' 25 May 2001 AGE-NC Project No. 95-01.00 1 Page 2 of 4 2.2. GROUND WATER SAMPLING ' Following well purging, ground water levels in the monitoring wells were allowed to achieve a minimum of 80 percent recharge of the initial water level prior to sample collection. Ground water samples were collected from the purged wells utilizing new, disposable polyethylene bailers and three 40-m1 volatile organic analysis (VOA) vials containing 0.5 ml 18% hydrochloric acid as a sample preservative. Care was taken to ensure that visible air bubbles were not present in the vials after filling and capping. Ground water sample containers were labeled with the well designation, date, time, and sampler's initials. 1 • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA ' Method 8015 Modified, • Volatile aromatic compounds - benzene, toluene, ethylbenzene'and total.xylenes (BTEX) with methyl tertiary-butyl ether(MTBE) in accordance with EPA Method 8020, • Oxygenated fuel additives - di-isopropyl ether (DEPE), ethyl tertiary butyl ether (ETBE), MTBE, tertiary amyl methyl ether(TAME) and tertiary butyl alcohol (TBA) in accordance '. EPA Method 8260 Modified. 3.0. FINDINGS Ground water elevation., flow direction and gradient were determined from field data collected on ' . 14 February and 07.May 2001; the contaminant impact to ground water was assessed from the ground water laboratory data. 3,1.1 GROUND WATER ELEVATION/FLOW DIRECTION AND GRADIENT. ' The ground depths to h MW-3 were measured between 47.38 and 48.38 p �' d water in wells MW-I through feet below the tops of well casings on 14 February and between 47.37 and 48.29 feet below the tops ' of well casings on 07 May; the groundwater elevations were calculated to-be between 67.87 feet and' 67:07 feet below mean sea level (msl) on 14 February and to be between 67.88 'fect and 68.16 feet below msl on 07 May 2001. Ground water elevation at the site decreased an average.1.3 feet between 7 - the-November--2000 andtheFebruary.2001-groundwater monitoring events and-increased.an average:•- . 0.05 feet between the February and May 2001 ground water monitoring events. The ground water elevation data collected during the February and May 2000 ground water monitoring events are ' depicted in Figure 3. Ground water flow direction for the area bound by the ground water wells was generally toward the northwest at a gradient of 0.001 ft/ft, or approximately 5.3 feet per mile during ,both sampling events. Advanced CeoEnvironmental, Ine.