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' 21 August 2002 AGE-NC Project No 95-0130 Page 2 of 6 1 Multi-level monitoring wells MW-6 (A, B, C,D and E) and MW-7 (B, C,D and E)were purged by ' lowering and raising a 318-inch outer diameter, length-discrete polyethylene hose equipped with a ball-valve water tip through the top chambers into the specific water-charged screened section A ' Watera-Hydro-Lift II pump equipped with a mechanical arm was utilized to surge the polyethylene hose Approximately % to 3%gallons of ground water(a minimum of three casing-water volumes per well)were purged from the multi-level monitoring wells except MW-6A,which had insufficient ' groundwater to purge Temperature,pH and conductivity were measured for stabilization at regular purge-volume intervals from each well using the Oakton water analyzer Field data and logs are in Appendix A Multi-level well purged ground water was transferred to 55-gallon drums and stored ' on-site in an area lacking general public access ' 2 2 GROUND WATER SAMPLING Ground water samples were collected from purged wells MW-6 (A, B, C, D and E) and MW-7 (B, ' C, D and E) utilizing %4-inch diameter polyethylene tubing, ground water samples were collected from all other purged wells utilizing new, 2-inch diameter disposable polyethylene bailers Ground . water samples were transferred into 40-m1 EPA-approved VOA vials containing 0 5 ml 18% Ihydrochloric 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 I23 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, • Benzene,toluene,ethylbenzene and xylene(BTEX)and methyl-tertiary butyl ether(MTBE) Iby EPA Method 8020, • 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 (EBD) by EPA Method 8260 Modified • Advanced GeoEnvironmental,Inc