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24 May 2005 <br /> AGE-NC Project No 98-0448 <br />' Page 2 of 9 <br />' letter dated 07 April 1999 As-built monitoring well construction details also are summarized in <br /> Table 1 <br /> r2 1 WELL MONITORING AND EVACUATION <br />' During the March 2005 monitoring event, depth to ground water measurements were collected in <br /> monitoring wells MWA, MW-2, MW-4A/B, MW-5 MW-6 and MW-8 from the top of the well <br /> casing to the nearest 0 01-foot utilizing a Solinst water level meter,ground water measurements were <br /> not collected from wells MW-3 and MW-7 due to a parked vehicle and lumber storage,respectively, <br /> obstructing access to the wells The ground water elevation in each well was calculated by <br /> subtracting the measured depth to ground water from the surveyed casing elevation (Table 1) <br />' Ground water elevations were plotted and contoured on a scaled site map (Figure 3) <br /> After water levels were measured, approximately 5 to 10 gallons of ground water (a minimum of <br />' three casing-water volumes per well)were evacuated(purged)from wells MW-1,MW-2,MW-4A, <br /> MW-6 and MW-8 utilizing polyethylene disposable bailers'Approximately 13%2 gallons of ground <br /> water was purged from well MW-4B by lowering and raising a5/8-inch outer diameter,polyethylene <br /> hose equipped with a ball-valve water tip through the screened section A Waterra Hydro-Lift II <br /> pump equipped with a mechanical arm was utilized to surge the polyethylene hose Temperature,pH <br />' and conductivity were measured for stabilization at regular purge-volume intervals from each well <br /> using an Oakton water analyzer Field data and logs are provided in Appendix A Purged ground <br /> water was containerized in properly labeled Department of Transportation (DOT)-approved <br /> 55-gallon drums and was stored on-site in an area lacking general public access <br /> 22 GROUND WATER SAMPLING <br /> Following well purging, the ground water level in each of the purged wells was allowed to achieve <br />' a minimum of 80%recharge prior to sample collection Ground water samples were collected from <br /> the purged wells utilizing new, disposable polyethylene bailers and transferred into 40-m1 EPA <br /> approved volatile organic analysis(VOA)vials containing 0 5 ml 18%hydrochloric acid'as a sample <br /> preservative Care was taken to ensure that visible air bubbles were not present in the vials after <br /> filling and capping Ground water sample containers were labeled with the well designation, date, <br /> time, and sampler's initials <br /> 1 <br /> Advanced GeoEnvironmental,Inc <br />