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1 _ <br /> . 13 April 2001 <br />' AGE-NC Project No 96-0232 <br /> Page 8of14 <br />' 3 2 GROUND WATER SAMPLING <br /> Following well purging, ground water levels In all of the above mentioned monitonng wells <br />' achieved a minimum of 80 percent recharge prior to sample collection Ground water samples were <br /> collected from the purged wells MW-1 through MW-7 utilizing new, 2-inch diameter disposable <br />' polyethylene bailers, ground water samples were collected from the purged wells MW-8 through <br /> MW-13 utilizing %4-inch diameter polyethylene tubing Ground water samples were transferred into <br /> one-liter amber bottles without a preservative and into 40-m1 EPA-approved VOA vials containing <br />' 0 5 ml 18% hydrochloric acid as a sample preservative Care was taken to ensure that visible air <br /> bubbles were not present in the vials after filling and capping Ground water sample containers were <br /> labeled with the well designation, date, Mane, and sampler's initials <br />' Ground water sample collection from domestic water wells RDW-1 and DW-1 was achieved by <br /> opening the valve from the outlet sample port and allowing the pump to tum on and operate for a <br />' minimum of 15 minutes to purge the wells and then collecting the running water directly into the <br /> 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 /> 3 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was togged on a cham-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 5030/8015 Modified and 3550/8015 Modified, <br /> respectively, <br /> • BTEX by EPA Method 8020, and <br /> • Methanol, ethanol, TBA, RIPE, ETBE, TAME and MTBE by EPA Method 8260 Modified <br /> 34 FINDINGS <br /> IGround water elevation, flow direction and gradient were determined from field data collected on <br /> 08 and 09 March 2001, the contaminant impact to ground water was assessed from the laboratory <br /> data <br /> Advanced GeoEnvironmental,Inc <br />