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I <br /> 13• July 2001 <br /> AGE-NC Protect No 96-0232 <br /> Page 8of15 <br /> After water levels were measured, approximately 5 to 8 gallons of ground water(a minimum of three <br /> casing-water volumes per well)were removed from wells MW-1, MW-2, MW-4, MW-5, MW-6A, <br /> MW-6B and MW-7 utilizing a two-stage submersible pump or a disposable polyethylene bailer, <br /> ground water pumping was initiated at the top of the water column and the pump was slowly lowered <br /> to total depth to purge ground water within the entire well casing Temperature,pH and conductivity <br /> were measured for stabilization at regular purge-volume intervals from each well using a Hydac <br /> water analyzer Field data and logs are in Appendix G Monitoring well purged ground water was <br /> transferred to the ground water remediation system holding tank for treatment and disposal <br /> The multi-level monitoring wells MW-8 through MW-13 were purged by lowering and raising a <br /> 318-inch outer diameter, length-discrete polyethylene hose equipped with a ball-valve water tip <br /> through the top chambers into the specific water-charged screened section Approximately 1 to 5 <br /> gallons of ground water (a minimum of three casing-water volumes per well) were removed from <br /> the multi-level monitoring wells Multi-level well purged ground water was transferred to the ground <br /> water remechation system holding tank for treatment and disposal Field data logs are included with <br /> Appendix G <br /> lie 3 2 GROUND WATER SAMPLING <br /> Following well purging, ground water levels in all of the above mentioned monitoring wells <br /> achieved a minimum of 80 percent recharge prior to sample collection Ground water samples were <br /> collected from the purged wells MW-1 through MW-7 utilizing new, 2-inch diameter disposable <br /> polyethylene bailers, ground water samples were collected from the purged wells MW-8 through <br /> MW-13 utilizing 1/4-inch diameter polyethylene tubing Ground water samples were transferred into <br /> one-liter amber bottles without a preservative and into three 40-m1 EPA-approved VOA vials <br /> containing 0 5 ml 18% hydrochloric acid as a sample preservative Care was taken to ensure that <br /> visible air bubbles were not present in the vials after filling and capping Ground water sample <br /> containers were labeled with the well designation, date, time, and sampler's initials <br /> Ground water sample collection from municipal water wells CSA-1, CSA-2 and domestic water <br /> wells RDW-1 and DW-1 was achieved by opening the valve from the outlet sample port and <br /> allowing each well pump to turn on and operate for a minimum of 15 minutes to purge the wells and <br /> then collecting the running water directly into the sample containers <br /> Ground water samples were collected at sampling ports located near the tops of extraction wells <br /> EW-2, EW-4, EW-5,EW-6, EW-7, EW-8,EW-9 and EW-10, each extraction well was allowed to <br /> be operational for at least 30 minutes prior to collecting samples directly into the sample containers <br /> • <br /> I <br /> Advanced GeoEnvironmental,Inc <br /> I <br />