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1 ' 05 November 2002 0 AGE-NC Project No 96-0229 ' Page 2 of 5 ' from each well using an Oakton water analyzer Field data and logs are included with Appendix B Purged groundwater was contamenzed in 55-gallon drums and was stored on-site in an area lacking general public access I 2 2 GROUND WATER SAMPLING Following well purging,the ground water level from each well was allowed to achieve a minimum of 80 percent recharge prior to sample collection, however, recharge was not documented at well MW-2 Ground water samples were collected from the purged wells utilizing new, disposable polyethylene bailers, and transferred to 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 Inot present in the vials after filling and capping Ground water sample containers were labeled with the well designation, date, time, and sampler's initials I2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES 10 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 Method 5030/8015M, • Benzene,toluene,ethyl benzene and xylene(BTEX)and methyl-tertiarybutyl ether(MTBE) by EPA Method 8020, and • 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 8260 Modified 3.0. FINDINGS Ground water elevation, flow direction and gradient were determined from field data collected on 14 May 2002, the contaminant impact to ground water was quantified from the laboratory data • Advanced GeoEnvironmental,Inc