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' 07 June 2002 AGE-NC Project No 97-0333 ' Page 5 of 9 utilizing polyethylene disposable bailers Temperature, pH and conductivity were measured for stabilization at regular purge-volume intervals from each well using an Oakton water analyzer Copies of field data and logs are in Appendix D Purged ground water was containerized in 55-gallon ' drums and was stored on-site in an area lacking general public access ' 3 2 GROUND WATER SAMPLING Following well purging, ground water levels in the monitoring wells were allowed to achieve a minimum of 80 percent recharge prior to sample collection Ground water samples were collected from each of the purged wells utilizing new, disposable polyethylene bailers and transferred into 1-liter amber bottles without sample 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 labeled with the well designation, date, time, and sampler's initials 4 10 3 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES Each ground water sample was logged on a chain-of-custody form,placed In a chilled container and I, transported to a DHS-certified laboratory for analysis for F O TPH-g and TPH-d by EPA Methods 35501503018015 Modified, t ' O BTEX with MTBE by EPA Method 8020, C Methanol, ethanol, TBA, DIPE, ETBE, TAME, MTBE, PCE,TCE, 1,2-DCA and EDB by EPA Method 8260 Modified ' 34 FINDINGS ' Ground water elevation, flow direction and gradient were determined from field data collected on 26 February 2002, the contaminant impact to ground water was quantified from the laboratory data 3 4 1 GROUND WATER ELEVATION AND GRADIENT The depths to ground water in wells MW-1 through MW-6 were measured between 15 70 and 17 21 feet below the tops of well casings, ground water elevations were calculated to be between Advanced GeoEnvironmental,Inc s