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26 January 2001 <br /> AGE-NC Project No 95-0104 <br /> Page 2 of 4 <br /> I2 2 COLLECTION OF GROUND WATER SAMPLES <br /> Following well purging, ground water levels in monitoring wells MW-1, MW-5, and MW-6 <br /> achieved a minimum of 80 percent recharge prior to sample collection Ground water samples were <br /> collected from the purged wells utilizing new, disposable polyethylene bailers and three 40-m1 <br /> EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative Care <br />' was taken to ensure that visible air bubbles were not present in the vials after filling and capping <br /> The ground water sample containers were labeled with the well designation, date, bine, and <br /> Isampler's initials <br /> I2 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 /> I 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 Method 5030/8015M, <br /> • Volatile aromatic compounds - benzene, toluene, ethyl benzene and xylene (BTEX) and <br /> I 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 /> 3.0 FINDINGS <br /> Ground water flow direction and gradient were inferred from data collected in the field, ground water <br />' levels were within the screen interval of well MW-1 and above the screened intervals in wells MW-5 <br /> and MW-6 The hydrocarbon impact to ground water was quantified by the laboratory data obtained <br /> from the ground water samples <br /> I <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> During the December 2000 sampling event, depths to ground water in wells MW-1, MW-5 and <br /> MW-6 were measured between 59 92 and 60 54 feet below the tops of well casings Ground water <br /> elevation at the site decreased an average 2 31 feet between the June 2000 and the December 2000 <br /> ground water monitoring events The ground water elevation data for wells MW-1, MW-5 and <br /> Advanced GeoEnvkroamental,Inc <br />