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i I <br /> (' I <br /> \� <br /> 0$ September 2005 <br /> AGE-NC Project No 97-0333 <br /> Page 5of11 <br /> casing-water volumes per well)were evacuated(purged)from wells MW-1 through MW-6 utilizing <br /> disposable polyethylene bailers Temperature,pH,and conductivity were measured for stabilization <br /> at regular purge-volume intervals from each well using an Oakton water analyzer Field data and logs <br /> are provided in Appendix E The purged ground water from wells MW-1 through MW-6 was <br /> transferred to the ground water remediation system holding tank for treatment and disposal <br /> ' The multi-level monitoring wells MW-7 through MW-13 were purged utilizing a Waterra Hydro-Lift <br /> 11 pump equipped with a mechanical arm by lowering and raising a3/8-inch outer diameter, length- <br /> discrete polyethylene hose equipped with a ball-valve water tip through the top chambers into the <br /> ' <br /> specific water-charged screened section Approximately 0 60 to 5 gallons of ground water (a <br /> minimum of three casing-water volumes per well)were purged from multi-level monitoring wells <br /> MW-7 through MW-13 Temperature, pH, and conductivity were measured for stabilization at <br /> regular purge-volume intervals from each well using an Oakton water analyzer Field data and logs <br /> are provided in Appendix E Multi-level well purged ground water was transferred to the ground <br /> water remediation system holding tank for treatment and disposal <br /> 32 GROUND WATER SAMPLING <br /> Ground water samples were collected from purged wells MW-1 through MW-6 utilizing new,2-inch <br /> ' diameter disposable polyethylene bailers, ground water samples were collected from purged wells <br /> MW-7 through MW-13 utilizing %-inch diameter polyethylene tubing and the above-referenced <br /> Waterra Hydro-Lift II system Ground water samples were transferred into 40-m1 EPA-approved <br /> VOA vials containing 0 5 ml 18% hydrochloric acid solution as a sample preservative Care was <br /> taken to ensure that visible air bubbles were not present in the vials after filling and capping Ground <br /> water sample containers were labeled with the well designation, date, time, and sampler's initials <br /> 33 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> ' Each ground water sample was logged on a chain of custody form,placed in a chilled container,and <br /> transported to Cal Tech Environmental Laboratories, a DHS-certified laboratory, for analysis for <br /> • TPH-g by EPA Method 8015M, and <br /> ' • BTEX and fuel oxygenates PCE, TCE, 1,2-DCA, EDB, MTBE,TAME, DIPS, ETBE, and <br /> TBA by EPA Method 8260B <br /> Advanced GeoEnviroamental,Inc <br />