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' 20 May 2005 i AGE-NC Project No. 97-0327 ' Page 2of5 ' containerized in California Department of Transportation (DOT)-approved model 17H 55-gallon drums and stored at the site. i2.2. GROUND WATER SAMPLING i 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 1-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 E 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 5 03 0/8015 and LUFT/801513; • Benzene,toluene,ethylbenzene, xylene(BTEX)and methyl-tertiary butyl ether(MTBE)by EPA Method 8020. ' • 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 ' MTBE by EPA Method 5030/8260. J 3.0. FINDINGS Field data was utilized to determine ground water elevation, flow direction and gradient. Petroleum ='hydrocarbon=impact'to`ground`water was`quantified'by`labotatory�arialysis:j" AdvancedeoEnvironment nc _ . G al,Inc.