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V I <br /> � ' 1 <br /> r' <br /> 08 October 1999 Y " <br /> AGE-NC Project No 95=0121, <br /> Page 2 of 6 k a <br />' 2 2 GROUND WATER SAMPLING <br /> Following well purging, ground water levels in monitoring wells MW-I, MW-2; MW-3,` MW-4, <br /> MW-7, VW-3,VW-4, VW-6 and VW-8 achieved a minimum of 80 percent recharge prior to sample <br /> collection Ground water samples were collected from the purged wells utilizing new,disposable <br /> polyethylene bailers, one-liter amber bottles and three 40-m1 EPA-approved VOA vials containing <br /> 4 5 ml 1$% hydrochloric acid as a preservative Care was taken to ensure that visible air bubbles <br /> were not present in the vials after filling and capping Ground water sample containers were labeled <br />' with the well designation, date, time, and sampler's Initials <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 /> for n <br /> "r <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, .- <br /> respectively) by EPA Method 8015M, <br /> •A Volatile aromatic compounds (benzene, toluene, ethyl benzene and xylene BTEX) with <br /> methyl-tertiary butyl ether(MTBE) by EPA Method 8020, and <br /> • Tertiary Butanol (TBA), di-isopropyl ether (DIPS), ethyl tert butyl ether (ETBE),'tert amyl , <br /> methyl ether (TAME) and MTBE by EPA Method 8260M <br /> t f <br /> 30. FINDINGS <br /> t AGE determined ground water flow direction and gradient from the field datarcollected on 28 June <br /> 1999 Laboratory analysis detected TPH-g and BTEX in nine ground water samples, fuel oxygenated _ <br /> compounds were detected in six ground water samples <br /> I <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT L <br /> The depths to ground water from wells MW-1, MW-2, MW-3, MW-4, MW-7, VW-3, VW-4, VW-6 <br /> and VW-8 were measured at-between 1482 and:15 67 feet below the tops of the well casings <br /> Ground water elevations at the site were calculated to be between 8 62 feet and 9 04 feet below mean <br /> sea level, ground water elevations are depicted in,Figures 3 and 4 Ground water elevation at the site <br /> Advanced GeoEn%ironmental,Inc <br />