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` 04 March 2002 AGE-NC Project No 95-0130 Page 2 of 6 ' The multi-level monitoring wells MW-6 (A, B, C, D and E) through 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 I A Watera-Hydro-Lift II pump equipped with a mechanical arm was utilized to surge the polyethylene hose Approximately %to 3%Z gallons of ground water(a minimum of three casing-water volumes per well) were purged from the multi-level monitoring wells Ground water was not encountered in screen interval MW-7A, ground water recharge was not documented from MW-6A, however sufficient water sample was collected from the polyethylene hosing to fill the sample containers Temperature,pH and conductivity were measured for stabilization at regular purge-volume intervals from each well using a Hydac water analyzer Field data and logs are in Appendix A Multi-level well purged ground water was transferred to 55-gallon drums and was stored on-site in an area lacking general public access 2 2 GROUND WATER SAMPLING IGround water samples were collected from the purged wells MW-1,MW-2, MW-3, MW-4, MW-5, VW-1B, VW-1C, VW-2A and VW-3A utilizing new, 2-inch diameter disposable polyethylene bailers, ground water samples were collected from the purged wells MW-6 (A, B, C, D and E) and MW-7 (B, C, D and E)utilizing t/4-inch diameter polyethylene tubing Ground water samples were transferred into 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 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 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) ' by 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 IAdvanced GeoEnvironmental,inc I