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Ile 17 October 2005 AGE-NC Project No. 97-0327 ' Page 2 of 4 ' drums and stored at the site. 2.2. GROUND WATER SAMPLING After each well was purged, ground water levels were remeasured to verify the amount of ground ' water recharge. Upon achieving at least 80% ground water recharge, samples were collected from wells MW-1 through MW-4 utilizing the techniques described above in purging each well. Ground water samples were transferred into 40-m1 EPA-approved volatile organic analysis (VOA) vials ' containing 0.5 ml 18%hydrochloric acid as a sample preservative and I-liter amber bottles without 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. 2.3. 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 California Department of Health Services (DHS)-certified laboratory; the ground water samples were analyzed for: ' • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, respectively).by EPA Method 8015M; • Benzene,toluene,ethylbenzene,xylene(BTEX),methyl-tertiary butyl ether(MTBE)by EPA Ethylene dibromide (EDB), 1,2-dichloroethane (1,2-DCA), tertiary butanol (TBA), di- isopropyl ether(DIPE), ethyl tert butyl ether (ETBE), tert amyl methyl ether(TAME) and by EPA Method 8260B. 3.4. FINDINGS Field data was utilized to determine ground water elevation, flow direction and gradient.Petroleum hydrocarbon-impact to ground water was quantified by laboratory analysis. 3.1. GROUND WATER ELEVATION AND GRADIENT ' The depths to ground water in wells MW-1 through MW-4 were measured between 56.45 and • 58.04 feet below the tops of well casings; ground water.elevations in wells MW-1 through MW-4 ' Advanced GeoEnvironmental,Inc.