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1 , <br /> f <br /> 31 January 2003 <br /> AGE-NC Project No 96-0232 <br /> Page 8 of 17 <br /> The multi-level monitoring wells MW-8 through MW-13 were purged utilizing a Watera-Hydro-Lift kk <br />' H pump equipped with a mechanical arm by lowering and raising a 3/8-inch outer diameter, length- + <br /> discrete polyethylene hose equipped with a ball-valve water tip through the top chambers into the <br /> specific water-charged screened section Approximately 1/8 to 41/z gallons of ground water (a , 1 rI <br /> minimum of three casing-water volumes per well) were purged from the multi-level monitoring <br /> wells Temperature, pH and conductivity were measured for stabilization at regular purge-volume <br /> I intervals from each well' using an Oakton water analyzer Field data and logs are provided in - <br /> Appendix G Multi-level well purged ground water was transferred to the ground water remediation <br /> system holding tank for treatment and disposal <br /> 32 GROUND WATER SAMPLING <br /> I , { 0 1 ! 4 ' <br /> Ground water samples were collected from the purged wells MW-1 through MW-7,MW-14 through <br /> MW-18, EW-1 and EW-3 utilizing new, 2-inch diameter disposable polyethylene bailers, ground <br /> water samples were collected from the purged wells MW-8 through MW-13 utilizing %-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 VOA vials containing 0 5 ml 18%hydrochloric <br />' acid as a sample preservative Care was taken to ensure that visible air bubbles were not present in <br /> the vials after filling and capping Ground water sample containers were labeled with the well <br /> designation, date, time, and sampler's initials <br /> Ground water samples were collected at sampling ports located near the tops of extraction wells <br /> 1 r ' <br /> EW-2 and EW-4 through EW-10, each extraction well was allowed to be operational for at least 30 <br /> 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 y <br /> I33 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 Call fornia,Department of Health Services (DHS)-certified laboratory for analysis ' <br /> r <br /> for <br /> r ; <br /> • TPH-g, TPH-d and TPH-mo by EPA Methods 5030B/8015C Modified and 3510C/8015C <br /> • Modified, respectively, and ; <br /> 1 <br /> , <br /> Advanced GeoEnvnronmental,Inc <br /> f <br /> 1 ' <br /> 1 <br />