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12 December 2005 <br /> . AGE-NC Project No 97-0333 <br /> Page 5 of 11 <br /> water volumes per well) were evacuated (purged) from wells MW-1 through MW-5 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-I through MW-5 was <br /> transferred to the ground water remediation system holding tank for treatment and disposal <br /> Multi-level monitoring wells MW-7 through MW-13 were purged utilizing a Waterra Hydro-Lift Il , <br /> pump equipped with a mechanical arm by lowering and raising a %-inch outer diameter, length- <br /> discrete polyethylene hose equipped with a ball-valve water tip through the top chambers into the <br /> specific water-charged screened section Approximately 13 gallons of ground water(a minimum of <br /> three casing-water volumes per well) were evacuated (purged) from well MW-6 utilizing %-inch <br /> outer diameter,length-discrete polyethylene hose and approximately 0 5 to 5 gallons of ground water <br /> (a 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-5 utilizing new,2-inch <br /> diameter disposable polyethylene bailers, ground water samples were collected from purged wells <br /> MW-6 utilizing%-inch diameter polyethylene tubing and wells MW-7 through MW-13 utilizing 3/8- <br /> inch diameter polyethylene tubing and the above-referenced Waterra Hydro-Lift II system Ground <br /> water samples were transferred into 40-m1 EPA-approved VOA vials containing 0 5 ml 18%� <br /> ' hydrochloric acid solution as a sample preservative Care was taken to ensure that visible air bubbles <br /> were not present in the vials after filling and capping Ground water sample containers were labeled <br /> 'with the well designation, date,time, and sampler's initials <br /> 3 3 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, DIPE, ETBE, and <br /> • TBA by EPA Method 8260B <br /> ' Advanced GeoEnvironmental,Inc <br /> 1 <br />