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' 10 October 2000 <br /> AGE-NC Project No 97-0249 <br />' Page 2 of 5 <br />' stored on-site in an area lacking general public access <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 /> 1-liter amber bottle without a preservative and four 40-m1 EPA-approved VOA vials containing 0 5 <br />' ml 18%hydrochloric acid as a sample 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, time, and sampler's initials <br /> 1 <br /> 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was togged 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 /> 40 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 /> Ibutyl ether(ETBE), tert amyl methyl ether(TAME) and MTBE by EPA Method 8260M <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 30 August 2000, the contaminant impact to ground water was assessed from the ground water <br /> laboratory 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 13 82 and 16 08 <br /> feet below the tops of well casings, ground water elevations were calculated to be between 5 91 feet <br /> Advanced GeoEnvironmental,Inc <br />