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1 I 29 March 2001 AGE-NC Project No 98-0448 ' Page 2 of 5 ' 2 2 - GROUND WATER SAMPLING Following well purging, ground water levels in monitoring wells MW-1, MW-4A, MW-4B, MW-6 ' and MW-8 were allowed to achieve a minimum of 80 percent recharge prior to sample collection Ground water samples were collected from the purged wells utilizing new, disposable polyethylene bailers and three 40-ml 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 I 23 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 for analysis for . Total petroleum hydrocarbons quantified as gasoline (TPH-g)by EPA Methods 5030/8015 Modified, • Volatile aromatic compounds - benzene, toluene, ethyl benzene and xylene (BTEX) with Imethyl-tertiary butyl ether(MTBE) by EPA Method 8020, • Fuel oxygenated compounds -methanol, ethanol, tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert butyl ether (ETBE), tert amyl methyl ether(TAME) and MTBE by EPA Method 8260 Modified, and •. 1,2-Dichloroethane (1,2-DCA) and ethylene dibromide (EDB) by EPA Method 8260 IModified 3.0. FINDINGS s ' AGE determined ground water flow direction and gradient from the field data collected on 18 January 2001, the contaminant impact to ground water was assessed from the laboratory data 3 1 GROUND WATER ELEVATION AND GRADIENT The depths to ground water in wells MW-1, MW-4A, MW-4B, MW-6 and MW-8 were measured Advanced GeoEnvironmental,Inc I