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' 23 April 2003 S AGE-NC Project No 95-0130 ' Page 2 of 6 ' analyzer Field data and logs are provided in Appendix A Purged ground water was containerized in 55- gallon drums and stored on-site in an area lacking general public access ' Multi-level monitoring wells MW-6(A-E)and MW-7(A-E)were purged by lowering and raising a 318-mch 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 mechamcal arm was utilized to surge the polyethylene hose Approximately 0 40 to 3 25 gallons of ground water(a minimum of three casing-water volumes per well)were purged from each well, ' however,there was not a sufficient amount of ground water available in wells MW-6A or MW-7A to effectively purge Temperature,pH and conductivity were measured for stabilization at regularpurge- 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-E) and MW-7 (A-E)utilizing 3/8-inch diameter polyethylene tubing,ground water samples were collected from all other purged wells utilizing new,2-inch diameter disposable polyethylene bailers Groundwater samples were transferred into 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 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 I2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES I 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 I Modified, • Benzene,toluene,ethylbenzene and xylene(BTEX)and methyl-tertiary butyl ether(MTBE)by EPA Method 8020, and • 1,2-Dichloroethane(1,2-DCA),ethylene dibromide(EBD),tertiary butanol(TBA),di-isopropyl 1 ether(DIPE),ethyl tert butyl ether(ETBE),tert amyl methyl.ether(TAME)and MTBE by EPA I Method 8260 Modified, I Advanced GeoEnvironmental,Inc