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I , <br /> 1 <br /> ' 24 August 2005 <br /> AGE-NC.Project No. 97-0301 <br /> ' Page 2 of 6 <br /> On 13-June 2005, single-completion monitoring wells MW-1 through MW-7 and multi-level <br /> monitoring wells MW-8 through MW-12 were purged by lowering and raising a length-discrete <br /> polyethylene hose(3/a-inch CMT and%-inch outer diameter),equipped with a ball'-valve water tip <br /> through the top chambers into the specific water-charged screened section. A Waterra Hydro-Lift <br /> t II pump equipped with a mechanical arm was utilized to surge each well with 3/8-inch diameter <br /> polyethylene hose. Approximately 4.5 to 30 gallons of ground water (a minimum of three casing- <br /> water volumes per well) were purged from_single-completion wells MW-1 through MW-7 and <br /> approximately 0.45 to 3.25 gallons were purged from multi-level wells MW-8 through MW-12. <br /> Temperature,pH,and conductivity were measured for stabilization at regular purge-volume intervals <br /> ' from each well using an Oakton water analyzer.Field data and logs are included in Appendix A.All <br /> purged ground water was transferred to Department of Transportation(DOT)-approved model 17H <br /> 55-gallon drums and stored on-site in an area lacking general public access. <br /> 2.2. GROUND WATER SAMPLING <br /> ' After each well wasur ed round water levels were re-measured to verify the amount of ground <br /> p g , g f}' <br /> water recharge. Upon achieving at least 80%.ground water recharge, samples were collected from <br /> ' wells MW-I through MW-12,utilizing the techniques described above in purging each well.Ground <br /> water samples from each well were transferred into three 40 milliliter(ml)EPA-approved volatile <br /> organic analysis (VOA) vials containing 0.5 ml 18% hydrochloric acid solution as a sample <br /> ' preservative and one 1-liter amber bottle without sample preservative.Care was taken to ensure that <br /> visible air bubbles were not present in the vials after filling and capping. Ground water sample <br /> containers were labeled with the well designation, date,time, and sampler's initials. <br /> 2.3. LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Following collection and labeling,each ground water sample was logged on a chain of custody form, <br /> ' placed in a chilled container, and transported to Cal Tech Environmental Laboratories (CTEL), a <br /> California Department of Health Services (DHS)-certified laboratory, for analysis for: <br /> • Total petroleum hydrocarbons quantified as gasoline,diesel,kerosene,and motor oil(TPH-g, <br /> TPH-d, TPH-k, and TPH-mo, respectively)by EPA Method 8015M; and <br /> • Benzene,toluene, ethylbenzene, and xylenes(BTEX),methyl tertiary-butyl ether(MTBE), <br /> ' 1,2-Dichloroethane(1,2-DCA),ethylene dibromide(EBD),di-isopropyl ether(DIPE),ethyl <br /> tent-butyl ether(ETBE),tert-amyl methyl ether(TAME),and tertiary butanol(TBA)by EPA <br /> Method 8260B. ,- <br /> Advanced GeoEnvironmental,Inc. <br /> III , <br />