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r <br />' 02 December 1998 <br /> AGE-NC Project No 95-0130 <br /> Page 2 of 5 <br />' 2 2 GROUND WATER SAMPLING <br /> Following purging,ground water levels in monitoring wells MW-1 through MW-5,VW-1 C,VW-2A <br />' and VW-3A achieved 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 and four <br /> 40-m1 EPA-approved VOA vials containing 0 5 ml 18%hydrochloric acid as a preservative Care <br />' was taken to ensure that visible air bubbles were not present in the vials after filling and capping <br /> Ground water sample containers were labeled with the well designation, date, time, and sampler's <br />' 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 /> 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 (DIPE), ethyl tert butyl <br /> ether (ETBE), tert amyl methyl ether(TAME) and MTBE <br /> I3.0 FINDINGS <br /> From the field data, AGE was able to determine the ground water flow direction and gradient <br /> ILaboratory analysis detected petroleum hydrocarbons in seven ground water samples, oxygenated <br /> fuel additives were detected in six ground water samples <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The depths to ground water from wells MW-I through MW-5, VW-1 C, VW-2A and VW-3A were <br /> measured between 40 17 and 4132 feet below the top of well casings Between December 1997 and <br /> September 1998, ground water elevation increased an average 6 97 feet at the site The ground water <br /> elevation data for MW-1 through MW-5, VW-1C, VW-2A and VW-3A during the September 1998 <br /> ground water monitoring event is depicted in Figure 3 <br /> Advanced GeoEnvironmental,Inc <br />