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13 December 2002 <br /> iAGE-NC Protect No 95-0130 <br /> Page 2 of 6 <br /> Multi-level monitoring wells MW-6 (A, B, C,D and E) and MW-7 (B, C,D and E)were purged by <br /> Ilowering and raising a 3/8-Inch outer diameter, length-discrete polyethylene hose equipped with a <br /> ball-valve water tip through the top chambers Into the specific water-charged screened section A <br /> Watera-Hydro-Lift H pump equipped with a mechanical arm was utilized to surge the polyethylene <br /> ihose Approximately 1/8 to 3'/4 gallons of ground water(a minimum of three casing-water volumes <br /> per well) were purged from each well Temperature, pH and conductivity were measured for <br /> I stabilization at regular purge-volume intervals from each well using the Oakton water analyzer Field <br /> data and logs are in Appendix B Multi-level well purged ground water was transferred to 55-gallon <br /> drums and stored on-site in an area lacking general public access <br /> 2 2 GROUND WATER SAMPLING <br /> Ground water samples were collected from purged wells MW-6 (A, B, C,D and E) and MW-7 (B, <br /> C, D and E) utilizing 1/4-inch diameter polyethylene tubing, ground water samples were collected <br /> from all other purged wells utilizing new,2-inch diameter disposable polyethylene bailers Ground <br /> water samples were transferred into 40-m1 EPA-approved VOA vials containing 0 5 ml 18% <br /> hydrochloric acid as a sample preservative Care was taken to ensure that visible air bubbles were <br /> . not present in the vials after filling and capping Ground water sample containers were labeled with <br /> the well designation, date, time, and sampler's initials <br /> 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> IEach ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br /> transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br /> for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g)by EPA Methods 5030/8015 <br /> Modified, <br />' • Benzene,toluene,ethylbenzene and xylene(BTEX)and methyl-tertiary butyl ether(MTBE) <br /> by EPA Method 8020, and <br /> • 1,2-Dichloroethane (1,2-DCA), ethylene dibromide (EBD), tertiary butanol (TBA), di- <br /> isopropyl ether (DIPE), ethyl ten butyl ether (ETBE), tert amyl methyl ether (TAME) and <br /> MTBE by EPA Method 8260 Modified, <br /> Advanced GeoEnvironmental,Inc <br /> I <br />