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29 June 2001 AGE-NC Project No 97-0333 Page 2 of 5 32 GROUND WATER SAMPLING Following well purging, ground water levels in the monitoring wells were allowed to achieve a ' minimum of 80 percent recharge prior to sample collection Ground water samples were collected from each of the purged wells utilizing new, disposable polyethylene bailers, one 1-liter amber bottle without a preservative and three 40-m1 EPA-approved 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 33 LABORATORY ANALYSIS OF GROUND WATER SAMPLES Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and transported to a DHS-certified laboratory for analysis for ' • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d , ' respectively) by EPA Methods 8015M/5030 and 8015M/3550, respectively, Volatilc aromatic compounds - benzene, toluene, ethyl beiizeiie and xyle,iL (BTEX) %villi methyl-tertiary butyl ether (MTBE) by EPA Method 8020, • Fuel oxygenated compounds - tertiary butanol (TBA), di-isopropyl ether(DIPE), ethyl tert butyl ether(ETBE), tert amyl methyl ether(TAME), methanol, ethanol and MTBE by EPA ' Method 8260M, • Ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) by EPA Method 8260M, and ' Volatile organic compounds by EPA Method 8260 ' 30 FINDINGS ' Ground water elevation, flow direction and gradient were determined from field data collected on 30 April 2001, the contaminant impact to ground water was assessed from the ground water laboratory data 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT The depths to ground water in wells MW-1 through MW-6 were measured between 15 63 and 17 05 Advanc(d GcoF nvcronmant k1 Inc