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' 20 October 2000 • AGE-NC Project No 95-0142 ' Page 2 of 4 ' 2 2 GROUND WATER SAMPLE COLLECTION Water samples were collected from each well using new disposable plastic bailers and transferred into EPA-approved 40-milliliter (ml) VOA vials containing 0 5 ml hydrochloric acid (18%) as a ' sample preservative The vials were then labeled and placed in a chilled container for subsequent transport under chain-of-custody to McCampbell Analytical,Inc (MAI) Ground water samples were ' analyzed for the following • Total petroleum hydrocarbons quantified as gasoline (TPI -g) in accordance with EPA ' Method 8015 Modified, • Volatile aromatic hydrocarbons benzene, toluene, ethylbenzene and total xylenes (BTE&X) in accordance with EPA Method 8020, and ta Oxygenated fuel additives di-isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE), methyl tertiary-butyl ether(MTBE), tertiary-amyl methyl ether(TAME) and tertiary butanol (TBA), methanol, ethanol, ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260, respectively 3.4 FINDINGS ' 3 1 GROUND WATER GRADIENT AND DIRECTION Depth to ground water at the site ranged from 25 81 feet to 26 81 feet below the tops of the well ' casings The relative ground water elevation (based on an arbitrary benchmark) in the shallow screened wells ranged from 71 69 feet to 73 67 feet ' Theg round water elevation at the site in the deeper screened wells ranged from 13 60 feet to 14 21 below mean sea level (MSL) The elevation and ground water depth data is depicted in Table 1 ' During the October 2000 monitoring event, ground water flow direction in the shallow ground water g g table was toward the east with an average hydraulic gradient of 0 002 feet/feet and toward the north ' from the UST with an average hydraulic gradient of 0 01 feet/feet The relative elevation of the ground water surface at the site is illustrated on Figure 3 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH-g was detected in samples collected from wells MW-6, VW-1, VW-2, VW-3 and VW-4 at concentrations ranging from 110 micrograms per liter (µg11) in VW-4 to 180,000 ,ugll in VW-I