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21 June 2004 <br /> i AGE-NC Project No 97-0249 <br /> Page 2 of 7 <br /> concurrently, the Flag City Chevron ground water monitoring and analytical results are included in <br /> Appendix A <br /> 2 1 WELL MONITORING AND EVACUATION <br /> On 15 March 2004,depth to ground water was measured in each well from the top of the well casing <br /> to the nearest 0 01-foot utilizing a Solinst water level meter <br /> On 15, 16 and 17 March 2004,approximately 7 to 8 %gallons of ground water(a minimum of three <br /> casing-water volumes per well)were evacuated(purged)from single-level monitoring wells MW-1 <br /> through MW-6 utilizing dedicated, disposable polyethylene bailers Temperature, pH and <br /> I conductivity were measured for stabilization at regular purge-volume intervals from each well using <br /> an Oakton water analyzer Field data and logs are provided in Appendix B Purged ground water was <br /> containerized in 55-gallon drums and stored on-site in an area lacking general public access <br /> Multi-level monitoring wells MW-7 through MW-12 were purged by lowering and raising a 3/8-inch <br /> outer diameter, length-discrete polyethylene hose equipped with a ball-valve water tip through the <br /> top chambers into the specific water-charged screened section A Watera-Hydro-Lift II pump <br /> equipped with a mechanical arm was utilized to surge each well with a polyethylene hose <br /> Approximately 3/4 to 4 3/4 gallons of ground water (a minimum of three casing-water volumes per <br />' well)were purged from each well Temperature,pH and conductivity were measured for stabilization <br /> at regular purge-volume intervals from each well using the Oakton water analyzer Field data and <br /> logs are in Appendix B Multi-level well purged ground water was transferred to 55-gallon drums <br /> and stored on-site in an area lacking general public access <br />' 2 2 GROUND WATER SAMPLING <br /> After each well was purged,ground water levels were measured to verify the amount of ground water <br />' recharge Upon achieving at least 80% ground water,recharge, samples were collected from wells <br /> MW-1 through MW-12 utilizing the dedicated, disposable bailers or the Watera system Ground <br /> water samples were transferred into 40-m1 EPA-approved volatile organic analysis (VOA) vials <br />' containing 0 5 ml 18%hydrochloric acid as a sample preservative and 1-liter amber bottles without <br /> sample preservative Care was taken to ensure that visible air bubbles were not present in the vials <br /> after filling and capping Ground water sample containers were labeled with the well designation, <br /> date, time, and sampler's initials <br />' Advanced GcoEnvironmental,Inc <br /> I <br />