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1 _ <br /> 02 October 2000 <br /> • AGE-NC Project No 97-0301 <br /> Page 2 of 5 <br /> 2 2 GROUND WATER SAMPLING <br /> Following well purging, ground water levels in monitoring wells MW-1,MW-2, MW-3 and MW-4 <br /> were 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 preservative Care was taken to ensure that visible air bubbles were <br /> not present in the vials after filling and capping Ground water sample containers were labeled with <br /> the well designation, date, 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, diesel,kerosene and motor oil(TPH-g, <br /> ' TPH-d, TPH-k and TPH-mo, respectively)by EPA Method 8015M, <br /> • Volatile aromatic compounds - benzene, toluene, ethyl benzene and xylene (BTEX) with <br /> ' methyl-tertiary butyl ether(MTBE)by EPA Method 8020, <br /> • Fuel oxygenated compounds - tertiary butanol (TBA), di-isopropyl ether(DIPE), ethyl tert <br /> butyl ether(ETBE),tert amyl methyl ether(TAME), methanol, ethanol and MTBE by EPA <br /> Method 8260M, and <br /> • Ethylene dibromide(EDB) and 1,2-dichloroethane (1,2-DCA)by EPA Method 8260M <br /> ' 3.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> t 15 June 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, MW-2, MW-3 and MW-4 were measured between <br /> . 25 88 and 26 75 feet below the tops of the well casings, ground water elevations were calculated to <br /> Advanced GeaEnvironmental,Inc <br />