ARCHIVED REPORTS XR0000673 - Laserfiche WebLink

Home Browse Search

. 15 July 2002 AGE -NC Project No 96-0232 Page 8 of 21 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 through 15) On 13 and 14 June 2002, approximately 6 to 10 gallons of ground water (a mimmum of three casing - water volumes per well) were evacuated (purged) from wells MW -1 through MW -7 utilizing either disposable polyethylene bailers or a two-stage submersible pump, approximately 75 gallons of ground water were purged from EW -3 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 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 utilizing a Watera-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 20 to 4 75 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 for treatment and disposal 3 2 GROUND WATER SAMPLING Ground water samples were collected from the purged wells MW -1 through MW -7 and EW -3 utilizing new, 2-mch diameter disposable polyethylene bailers, 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 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 Iabeled 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 well D W-1 was achieved by openmg a valve from each water well outlet sample port and allowing each well pump to turn on and operate for a minimum of 15 minutes to purge the wells and then collecting the running water directly into the sample containers Advanced GeoEnvironmental, Inc