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09 May 2002 <br /> AGE-NC Project No 96-0232 <br /> Page 9of18 <br /> 4 2 GROUND WATER SAMPLING <br /> Ground water samples were collected from the purged wells MW-1 through MW-7 and EW-3 <br /> utilizing new,2-inch diameter disposable polyethylene bailers,ground water samples were collected <br /> from the purged wells MW-8 through MW-13 utilizing '/4-inch diameter polyethylene tubing <br /> Ground water samples were transferred into one-liter amber bottles without a preservative and into <br /> 40-m1 EPA-approved VOA vials containing 0 5 ml 18%hydrochloric acid as a sample preservative <br /> Care was taken to ensure that visible air bubbles were not present in the vials after filling and <br /> capping Ground water sample containers were labeled with the well designation, date, time, and <br /> sampler's initials <br /> Ground water sample collection from municipal water wells CSA-1,CSA-2 and domestic water well <br /> DW-1 was achieved by opening a valve from each water well outlet sample port and allowing each <br /> well pump to turn on and operate for a minimum of 15 minutes to purge the wells and then collecting <br /> the running water directly Into the sample containers <br /> Ground water samples were collected at sampling ports located near the tops of extraction wells <br /> EW-2, EW-4, EW-5, EW-6, EW-7, EW-8, EW-9 and EW-10, each extraction well was allowed to <br /> be operational for at least 30 minutes prior to collecting samples directly into the sample containers <br /> 43 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was Iogged 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, TPH-d and TPH-mo by EPA Methods 5030/8015 Modified and 3550/8015 <br /> Modified, respectively, <br /> • BTEX and MTBE by EPA Method 8020, and <br /> • Methanol,ethanol, 1,2-DCA,EDB,TBA,DIPE,ETRE,TAME and MTBE by EPA Method <br /> 8260 Modified <br /> 44 FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 26 March 2002, the contaminant impact to ground water was quantified by laboratory analysis of <br /> water samples collected on 27 and 28 March 2002 <br /> Advanced GeoEnvironmental,Inc <br />