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i ' 02 March 2005 I AGE-NC Project No 97-0333 Page 5 of 10 On 30-31 December 2004, approximately 4 to 12 gallons of ground water (a mimmum of three casing-water volumes per well)were evacuated(purged)from wells MW-I through MW-6 utilizing disposable polyethylene bailers Temperature,pH,and conductivity were measured for stabilization at regular purge-volume intervals from each well using an Oakton water analyzer Field data and logs are provided in Appendix E The purged ground water from wells MW-1 through MW-6 was transferred to the ground water remediation system holding tank for treatment and disposal ' The multi-level monitoring wells MW-7 through MW-13 were purged utilizing a Waterra Hydro-Lift II pump,equipped with a mechanical arm by lowering and raising a 3/8-inch outer diameter, length- discrete polyethylene hose equipped with a ball-valve water tip through the top chambers into the specific water-charged screened section Approximately 0 45 to 5 gallons of ground water (a minimum of three casing-water volumes per well)were purged from multi-level monitoring wells MW-7 through MW-13 Temperature, pH, and conductivity were measured for stabilization at regular purge-volume intervals from each well using an Oakton water analyzer Field data and logs are provided in Appendix E Multi-level well purged ground water was transferred to the ground water remediation system holding tank for treatment and disposal 1 3 2 GROUND WATER SAMPLING i Ground water samples were collected from purged wells MW-1 through MW-6 utilizing new,2-inch diameter disposable polyethylene bailers, ground water samples were collected from purged wells MW-7 through MW-13 utilizing 3/S-Inch diameter polyethylene tubing and the above-referenced Waterra Hydro-Lift H system Ground water samples were transferred into 40-m1 EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid solution 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 3 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES Each ground water sample was logged on a chain of custody form,placed in a chilled container,and ' transported to Cal Tech Environmental Laboratories, a DHS-certified laboratory, for analysis for • TPH-g by EPA Method 8015M, and • BTEX and fuel oxygenates PCE, TCE, 1,2-DCA, EDB, MTBE, TAME, DIPE, ETBE, and TBA by EPA,Method 8260B Advanced GeoEnvironmental,Inc