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r r <br />' 17 December 1998 <br /> • AGE-NC Project No 95-0173 <br />' Page 2 of 5 <br />' 2 2 GROUND WATER SAMPLING <br /> Following purging,ground water levels in monitoring wells MW-1 through MW-12,VW-1,AW-1B <br />' and AW-2B 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, one <br /> 1-liter amber bottle and four 40-m1 EPA-approved VOA vials containing 0 5 ml 18%hydrochloric <br />' acid as a preservative Care was taken to ensure that visible air bubbles were not present in the vials <br /> after filling and capping Ground water sample containers were labeled with the well designation, <br /> date,time, and sampler's initials <br /> 1 <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 and diesel <br /> (TPH-g and TPH-d, respectively), <br />' • EPA Method 8020 for volatile aromatics (benzene, toluene, ethyl benzene and xylene <br /> BTEX)with methyl-tertiary butyl ether(MTBE), and <br /> e 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 /> 3.0. FINDINGS <br />' From the field data, AGE was able to determine the ground water flow direction and gradient <br /> Laboratory analysis detected petroleum hydrocarbons in twelve ground water samples, oxygenated <br /> fuel additives were detected in two ground water samples <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The depths to ground water from wells MW-I through MW-12, VW-1, AW-1B and AW-2B were <br /> measured between 24 80 and 27 29 feet below the top of well casings Between July 1998 and <br /> . October 1998,ground water elevation decreased an average 126 feet at the site The ground water <br /> Advanced GeoEnvironmentsl,Inc. <br />