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•L` � t° r„ ' -k- --- — _� - -' __�_-_...._.,__.. �,_ _ w _s _ u . .� ��pis-..,, .. .'r <br /> 31 May 2000 <br /> AGE-NC Project No 97-0249 <br />' Page 2 of 5 <br />' 2 2 GROUND WATER SAMPLING <br /> Following well purging, ground water levels in monitoring wells MW-1 through MW-6 were <br />' allowed to achieve a minimum of 80 percent recharge prior to sample collection Ground water <br /> samples were collected from the purged wells utilizing new, disposable polyethylene bailers, one <br />' I-liter amber bottle without a preservative and four 40-m1 EPA-approved VOA vials containing <br /> 0 5-ml 18% hydrochloric acid as a preservative Care was taken to ensure that visible air bubbles <br /> were not present in the vials after filling and capping Ground water sample containers were labeled <br />' with the well designation, date, tune, and sampler's initials <br />' 23 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 and diesel (TPH-g and TPH-d, <br /> respectively) by EPA Method 8015M, <br /> I o Volatile aromatic compounds benzene, toluene, ethyl benzene and xylene (BTEX) with <br /> methyl-tertiary butyl ether(MTBE) by EPA Method 8020, and <br /> • Fuel oxygenated compounds tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert <br /> butyl ether(ETBE), tert amyl methyl ether (TAME) and MTBE by EPA Method 8260M <br /> 30. FINDINGS <br /> IGround water elevation, flow direction and gradient were determined from field data collected on <br /> 25 February 2000, the contaminant impact to ground water was assessed from the ground water <br /> Ilaboratory data <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The depths to ground water in wells MW-1 through MW-6 were measured between 4 08 and 7 53 <br /> feet below the tops of well casings, ground water elevations were calculated to be between 2 09 feet <br /> and 2 70 feet above mean sea level Ground water elevation at the site increased an average 5 49 feet <br /> between the November 1999 and the February 2000 ground water monitoring events, increasing <br /> Iground water elevations have been observed at the site since August 1999 The ground water <br /> Advanced GeoEn\Ironrnenlal,Inc <br />