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i 30 November 1998 • AGE-NC Project No 95-0104 Page 2 of 5 2 2 GROUND WATER SAMPLING Following purging, ground water levels in monitoring wells MW-1, MW-5, MW-6 and VW-1 achieved a minimum of 80 percent recharge prior to sample collection Ground water samples were collected from the four purged wells utilizing new, disposable polyethylene bailers and four 40-m1 EPA-approved VOA vials contairung 0 5 ml preservative Care was taken to ensure that visible air bubbles were not present in the vials after filling and capping Ground water sample containers were labeled with the well designation, date, time, and sampler's initials I 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES iEach ground water sample was logged on a chain-of-custody form,placed in a chilled container and transported to a California Department of Health Services-certified laboratory for analysis in iaccordance with • EPA Method 8015M for total petroleum hydrocarbons quantified as gasoline (TPH-g), i• • EPA Method 8020 for volatile aromatics (benzene, toluene, ethyl benzene and xylene BTE&X) with methyl-tertiary butyl ether (MTBE), and i • EPA Method 8260 for tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert butyl ether(ETBE), tert amyl methyl ether(TAME) and MTBE I 3.0. FINDINGS i From the field data, AGE was able to determine the round water flow direction and gradient g Laboratory analysis detected fuel hydrocarbons in four ground water samples(MW-1,MW-5,MW-6 iand VW-1), oxygenated fuel additives were detected in two ground water samples (MW-1 and MW- 5) i 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT iThe depths to ground water from wells MW-1 through MW-6 and VW-1 were measured between 59 29 and 60 46 feet below the top of well casings Between June 1998 and September 1998,ground i water elevation decreased an average 5 69 feet at the site The ground water elevation data for MW-1 through MW-6 and VW-1 during the September 1998 ground water monitoring event is depicted in Figure 3 I Advanced GeoEnviron mental,Inc I