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• 30 January 2004 <br /> AGE-NC Project No 96-0232 <br /> Page 8 of 15 <br /> screened section Approximately 23 to 31 gallons of ground water(a minimum of three casing-water <br /> volumes per well)were purged from the single-completion monitoring wells and approximately 3/4 <br /> to 4%gallons of groundwater were purged from the multi-level monitoring wells Temperature,pH <br /> and conductivity were measured for stabilization at regular purge-volume intervals from each well <br /> using an Oakton water analyzer Field data and logs are provided in Appendix G, purged ground <br /> water was transferred to the ground water remediation system holding tank for treatment and <br /> disposal <br /> 3 2 GROUND WATER SAMPLING <br /> Groundwater samples were collected from the purged wells MW-1 through MW-7,MW-16,EW-1 <br /> and EW-3 utilizing new, 2-inch diameter disposable polyethylene bailers, ground water samples <br /> were collected from the purged wells MW-8 through MW-15,MW-17 and MW-18 utilizing 3/8-inch <br /> diameter polyethylene tubing Ground water samples were transferred into one-liter amber bottles <br /> without a preservative and into 40-m1 EPA-approved volatile organic analysis (VOA) vials <br /> containing 0 5 ml 18% hydrochloric acid as a sample preservative Care was taken to ensure that <br /> visible air bubbles were not present in the vials after filling and capping Ground water sample <br /> containers were labeled with the well designation, date, time, and sampler's initials <br /> Ground water samples were collected at sampling ports located near the tops of extraction wells <br /> EW-2 and EW-4 through EW-10, each extraction well was allowed to be operational for at least <br /> 30 minutes prior to collecting samples directly into the sample containers <br /> In addition, ground water samples were collected from municipal water wells CSA-1, CSA-2 by <br /> opening a valve from each water well outlet sample port and allowing each well pump to turn on and <br /> operate for a minimum of 15 minutes to purge the wells and then collecting the running water <br /> directly into the sample containers <br /> 3 3 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 Department of Health Services (DHS)-certified laboratory for analysis <br /> for <br /> • TPH-g and TPH-d by EPA Methods 5030B/8015Cm and 3510C/8015C, respectively, and <br /> • MTBE by EPA Method 8260B <br /> Advanced GeoEnvsronmental,Inc <br />