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24 September 2004 <br /> AGE-NC Project No 97-0301 <br /> Page 2 of 6 <br /> ' 2 1 WELL MONITORING AND PURGING <br /> On 3� 1rYioff. <br /> March 2004,depth to ground water was measured in each well from the top of the well casing <br /> I ' to the nearest 0 01-foot utilizing a Solinst water level meter <br /> On 31 March 2004, single-completion monitoring wells MW-1 through MW-7 and multi-level <br /> monitoring wells MW-8 through MW-12 were purged by lowering and raising a 3/8-inch outer <br /> diameter, length-discrete polyethylene hose equipped with a ball-valve water tip through the top <br /> chambers into the specific water-charged screened section A Watera-Hydro-Lift II pump equipped <br /> ' with a mechanical arm was utilized to surge each well with 5/8-inch diameter polyethylene hose <br /> Approximately 4 to 50 gallons of ground water(a minimum of three casing-water volumes per well) <br /> were purged from single-completion wells MW-1 through MW-7 and approximately 1/�to 3 gallons <br /> were purged from multi-level wells MW-8 through MW-12 Temperature,pH and conductivity were <br /> measured for stabilization at regular purge-volume intervals from each well using an Oakton water <br /> analyzer Field data and logs are included in Appendix B All purged grouted water was transferred <br /> ' to Department of Transportation(DOT)-approved model 17H 55-gallon drums and stored on-site � <br /> in an area lacking general public access <br /> r• <br /> 2 2 GROUND WATER SAMPLING <br /> After each well was purged,gro and 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 techniques described above in purging each well Ground water <br /> samples were transferred into 40-m1 EPA-approved volatile organic analysis(VOA)vials containing <br /> 0 5 ml 18% hydrochloric acid as a sample preservative and 1-liter amber bottles without 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 /> li <br /> 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> ' Following collection and labeling,each ground water sample was logged on a chain of custody form, <br /> placed in a chilled container and transported to a Cal Tech Environmental Laboratories,a California <br /> ' Department of Health Services (DHS)-certified laboratory, for analysis for <br /> • Total petroleum hydrocarbons quantified as gasoline,diesel,kerosene and motor oil(TPH-g, <br /> ' TPH-d, TPH-k and TPH-mo, respectively)by EPA Methods 8015G5030B/3510C, <br /> Advanced GeoEnvironmental,Inc <br />