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15 October 2001 AGE-NC Project No 96-0232 ' Page 8of17 ' water analyzer Field data and logs are in Appendix G Monitoring well 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 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 1 to 5 ' gallons of ground water (a minimum of three casing-water volumes per well) were removed from the multi-level monitoring wells Temperature, pH and conductivity were measured for stabilization at regular purge-volume intervals from each well using either an Oakton water analyzer or a Hydac water analyzer Field data and logs are in Appendix G Multi-level well purged ground water was transferred to the ground water remediation system holding tank for treatment and disposal 3 2 GROUND WATER SAMPLING ' Following well purging, ground water levels in all the purged monitoring wells achieved a muumum of 80 percent recharge prior to sample collection Ground water samples were collected from the purged wells MW-1 through MW-7 utilizing new, 2-inch diameter disposable polyethylene bailers, 10 ground water samples were collected from the purged wells MW--8 through MW-13 utilizing '/4-inch diameter polyethylene tubing Ground water samples were transferred into one-liter amber bottles without a preservative and into three 40-nil EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative Care was taken to ensure that visible wr 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 Ground water sample collection from municipal water wells CSA-1, CSA-2 and domestic water wells RDW-1 and DW-1 was achieved by opening the valve from the outlet sample port and allowing each well pump to turn on and operate for a mmumum of 15 minutes to purge the wells and ithen collecting the running water directly into the sample containers * Ground water samples were collected at sampling ports located near the tops of extraction wells EW-2, EW-4, EW-5, EW-6, EW-7, EW-8, EW-9 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 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 a Califorrua Department of Health Services (DHS)-certified laboratory for analysis for Advanced GeoEnvzronmental,Inc