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11 August 2003 <br /> . AGE-NC Project No 96-0232 <br />' Page 8 of 15 <br /> 32 GROUND WATER SAMPLING <br /> Ground water 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/s-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 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 <br /> 33 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 />' G TPH-g, TPH-d and TPH-mo by EPA Methods 503013/8015C Modified and 351008015C <br /> Modified, respectively, and <br /> 0 Methanol, ethanol, BTEX, MTBE, DIPE, TAME, ETBE and TBA by EPA Method 8260 <br /> Modified <br /> 34 FIlVDINGS <br />' Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 24 June 2003,the contaminant impact to ground water was quantified by laboratory analysis ofwater <br />' samples collected on 25, 26 and 27 March 2003 <br />' Advanced GcoEnvironmental,Inc <br />