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1 <br />' 24 December 2001 <br /> AGE-NC Project No 95-0130 <br />' Page 2 of 5 <br />' 2 2 GROUND WATER SAMPLING <br /> Following well purging, ground water levels in all purged wells achieved a minimum of 80 percent <br />' recharge prior to sample collection except for well VW-IB which achieved only 63 percent recharge <br /> Ground water samples were collected from the purged wells utilizing new, disposable polyethylene <br /> bailers and 40-m1 EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as a sample <br />' preservative Care was taken to ensure that visible air bubbles were not present in the vials after <br /> filling and capping Ground water sample containers were labeled with the well designation, date, <br /> time, and sampler's initials <br /> 2 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 /> - Total petroleum hydrocarbons quantified as gasoline(TPH-g)by EPA Methods 5030/8015 <br />� . Modified, <br /> Benzene, toluene, ethylbenzene and xylene (BTEX) and methyl-tertiary butyl ether (MTBE) <br /> Iby EPA Method 8020, <br /> Methanol, ethanol, tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert butyl ether <br /> I (ETBE), tert amyl methyl ether(TAME) and MTBE by EPA Method 8260 Modified, and <br /> - 1,2-Dichloroethane (1,2-DCA) and ethylene dibromide (EBD) by EPA Method 8260 <br /> Modified <br /> I <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 14 August 2001, the contaminant impact to ground water was quantified from the laboratory data <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The depths to ground water in wells MW-I through VW-3 were measured between 37 50 and 38 77 <br /> Ifeet below the tops of well casings, ground water elevations were calculated to be between 21 75 feet <br /> • and 22 41 feet below mean sea level Ground water elevation at the site decreased an average <br /> 1 07 feet between the May 2001 and the August 2001 ground water monitoring events The ground <br /> Advanced GeoEnvirOnmental,Inc <br /> I <br />