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1 <br />' 04 August 2000 <br /> w AGE-NC Project No 97-0300 <br />' Page 6 of 10 <br />' growth and bloremedial activity Copies of the microbial enumeration and physicochemical <br /> laboratory reports are included with Appendix F <br />' 3.0 QUARTERLY GROUND WATER MONITORING AND SAMPLING <br />' On 16 June 2000,ground water monitoring and sampling was performed at wells MW-1, MW-2 and <br /> MW-3, ground water elevation, flow direction and gradient were determined from the field data <br /> I3 1 MONITORING WELL PURGE PROCEDURES <br />' Depths to ground water were measured in each well from the tops of the well casings at the site to <br /> the nearest 0 01 foot utilizing a Solinst water level meter The ground water elevation in each well <br /> at the site was calculated by subtracting the measured depth to ground water from the surveyed <br />' casing elevation(Table 4) Ground water elevations were plotted and contoured on a scaled site map <br /> (Figure 9) <br /> I • After water levels were measured, approximately 8 to 20 gallons of ground water (a minimum of <br /> three casing water volumes per well) were removed from wells MW-1, MW-2 and MW-3 utilizing <br /> a submersible pump Approximately 14 gallons of ground water were removed from well MW-1, <br /> 10 gallons from MW-2 and 8 gallons from MW-3 before being pumped"dry" Temperature, pH and <br /> conductivity were measured for stabilization at regular purge-volume intervals from each well using <br /> I a Hydac water analyzer Field data and logs are included with Appendix G Purged ground water was <br /> containerized in 55-gallon drums and was stored on-site in an area lacking general public access <br /> 3 2 GROUND WATER SAMPLING <br /> I Following well purging, ground water levels from each well achieved a minimum of 80 percent <br /> recharge prior to sample collection Ground water samples were collected from the purged wells <br /> utilizing new,disposable polyethylene bailers, a one-liter bottle without preservative and four 40-m1 <br /> EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as a preservative Care was <br /> taken to ensure that visible air bubbles were not present in the vials after filling and capping Ground <br /> water sample containers were labeled with the well designation, date, time, and sampler's initials <br /> I <br /> I <br /> • <br /> Advanced GeoEnviron mental,Inc <br /> I <br />