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29 July 2005 <br /> AGE-NC Project No 96-0232 <br /> Page 3 of 9 <br /> water extraction remediation were used to purge ground water from wells EW-2, EW-5, EW-7 and <br /> EW-10, each of these wells was for at least 30 minutes at a flow rate of 5 to 6 gallons per minute, <br /> extracting a purge volume of between 150 to 180 gallons 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 provided in Appendix B The purged ground water was transferred <br /> to the ground water remediation system holding tank for treatment and disposal <br /> 2 2 GROUND WATER SAMPLING <br /> Ground water samples were collected from the purged wells MW-1 through MW-7,MW-16,EW-1, <br /> EW-3, EW-4, EW-6, EW-8 and EW-10 utilizing new, 2-inch diameter disposable polyethylene <br /> bailers,ground water samples were collected from the purged wells MW-613,MW-8 through MW-15 <br /> and MW-17 through MW-20 utilizing s/s-inch diameter polyethylene tubing Groundwater samples <br /> were collected at sampling ports located near the tops of extraction wells EW-2, EW-5, EW-7 and <br /> EW-10,each extraction well was allowed to be operational for at least 30 minutes prior to collecting <br /> samples and pouring directly into the sample containers Ground water samples were transferred into <br /> one-liter amber bottles without a preservative and into 40-m1 EPA-approved volatile organic analysis <br /> (VOA) vials containing 0 5 ml 18% hydrochloric acid as a sample preservative Care was taken to <br /> ensure that visible air bubbles were not present in the vials after filling and capping Ground water <br /> sample containers were labeled with the well designation, date, time, and sampler's initials <br /> 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was logged on a chain of custody form,placed in a chilled container and <br /> transported to a California DHS-certified laboratory for analysis for <br /> • TPH-g and TPH-d by EPA Methods 5030B/8015Cm and 3510C/8015C, respectively, <br /> • Methyl-tertiary butyl ether(MTBE) by EPA Method 8260B <br /> 24 FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 27 June 2005,the contaminant impact to ground water was quantified by laboratory analysis ofwater <br /> samples collected between 27 June and 01 July 2005, and on 14 July 2005 <br /> Advanced GeoEnvironmental,Inc <br />