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1 ' 15 October 2002 . AGE-NC Project No 96-0232 ' Page 8 of 19 ' water from the surveyed casing elevation (Table 4) Ground water elevation and vertical gradient data for wells MW-9, MW-11 and MW-13 was depicted in cross section C-C' (Figure 3), ground water elevations were plotted for the Informal First Zone,Second Zone,Secondary Aquifer Zone and ' Primary Aquifer Zone hydrogeologic flow units as defined in AGE's Final Remediation Plan (Figures 4, 5 and 6) ' On 05 and 06 September 2002, approximately 3 to 112-/3 gallons of ground water (a minimum of three casing-water volumes per well) were evacuated (purged) from wells MW-1 through MW-7 utilizing disposable polyethylene bailers, approximately 60 to 65 gallons of ground water were ' purged from wells EW-1, EW-3 and EW-9 utilizing a two-stage submersible pump 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 G The purged ' ground water was transferred to the ground water remediation system holding tank for treatment and disposal The multi-level monitoring wells MW-8 through MW-13 were purged utilizing a Watera-Hydro-Lift H pump equipped with a mechanical arm by lowering and raising a 3/a-inch outer diameter, length- ' discrete polyethylene hose equipped with a ball-valve water tip through the top chambers into the ie specific water-charged screened section Approximately 1 to 5 5 gallons of ground water (a minimum of three casing-water volumes per well) were purged from the multi-level monitoring wells 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 G Multi-level well purged ground water was transferred to the ground water remediation ' system holding tank far treatment and disposal I3 2 GROUND WATER SAMPLING Ground water samples were collected from the purged wells MW-1 through MW-7, EW-1, EW-3 and EW-9 utilizing new, 2-inch diameter disposable polyethylene bailers, ground water samples were collected from the purged wells MW-8 through MW-13 utilizing%-inch diameter polyethylene tubing Ground water samples were transferred into one-liter amber bottles without a preservative ' and 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, Itime, and sampler's initials I Ground water samples were collected at sampling ports located near the tops of extraction wells EW-2, EW-4 through EW-8 and EW-10, each extraction well was allowed to be operational for at least 30 minutes prior to collecting samples directly into the sample containers Advanced GeoEnvironmental,Inc