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1 ' <br />' 19 April 1999 <br /> • AGE-NC Protect No 95-0104 <br />' Page 2 of 5 <br /> public access <br /> I <br />' 2 2 GROUND WATER SAMPLING <br /> Following purging, ground water levels in monitoring wells MW-1, MW-5, MW-6 and VW-1 <br />' achieved a minimum of 80 percent recharge prior to sample collection Ground water samples were <br /> collected from the four purged wells utilizing new, disposable polyethylene bailers and four 40-m1 <br /> EPA-approved VOA vials containing 0 5 ml preservative Care was taken to ensure that visible air <br />' bubbles were not present in the vials after filling and capping Ground water sample containers were <br /> labeled with the well designation, date, time, and sampler's initials <br />' <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 />' • in accordance with <br /> • EPA Method 8015M for total petroleum hydrocarbons quantified as gasoline (TPH-g), <br />' • EPA Method 8020 for volatile aromatics (benzene, toluene, ethyl benzene and xylene <br /> BTEX) with methyl-tertiary butyl ether (MTBE), and <br />' • EPA Method 8260 for tertiary butanol (TBA), di-isopropyl ether (DIPS), ethyl tert butyl <br /> ether(ETBE), tert amyl methyl ether (TAME) and MTBE <br /> 3.0. FINDINGS <br /> From the field data, AGE was able to determine the ground water flow direction and gradient <br /> Laboratory analysis detected fuel hydrocarbons In four ground water samples(MW-1,MW-5,MW-6 <br />' and V W-1), oxygenated fuel additives were detected in two ground water samples (MW-1 and VW- <br /> 1) <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> During the January 1999 monitoring event,depths to ground water from wells MW-1 through MW-6 <br /> � and VW-1 were measured between 57 56 and 58 76 feet below the tops of well casings Ground <br /> Advanced GeoEnvironmentiml Inc <br />