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20 October 2003 <br /> sAGE-NC Project No 97-0301 <br /> Page 2 of 5 <br /> 1 2 2 GROUND WATER SAMPLING <br /> Following well purging,ground water levels at all wells achieved a minimum of 80 percent recharge <br /> prior to sample collection Ground water samples were collected from the purged wells utilizing <br /> new, disposable polyethylene bailers and transferred into 1-liter amber bottles without sample <br /> preservative and 40-m!EPA-approved volatile organic analysis(VOA)vials containing 0 5 ml 18% <br /> hydrochloric acid as a sample preservative Care was taken to ensure that visible air bubbles were <br /> not present in the vials after filling and capping Ground water sample containers were labeled with <br /> the well designation, date, time, and sampler's initials <br /> 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> ' Following collection and labeling,each ground water sample was logged on a chain-of-custody form, <br /> placed in a chilled container and transported to McCampbell Analytical, Inc , a California <br /> ' Department of Health Services (DHS)-certified laboratory, for analysis for <br /> • Total petroleum hydrocarbons quantified as gasoline,diesel,kerosene and motor oil(TPH-g, <br /> ' TPH-d, TPH-k and TPH-mo respectively)by EPA Methods 8015C/5030B/35I OC, <br /> • Benzene, toluene, ethyl benzene and xylene (BTE&X) and methyl tertiary-butyl ether <br /> ' (MTBE) by EPA Method 8021B, and <br /> • 1,2-Dichloroethane(1,2-DCA),ethylene dibromide(EBD),di-isopropyl ether(DIPE),ethyl <br /> tert butyl ether(ETBE),MTBE,tert amyl methyl ether(TAME),tertiary butanol (TBA)by <br /> EPA Method 8260B <br /> ' 3.0. FINDINGS <br /> ' Ground water elevation,flow direction and gradient were determined from field data collected on 20 <br /> June 2003 The contaminant impact to ground water was quantified by the ground water laboratory <br /> data <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The depths to ground water in wells MW-1 through MW-7 were measured at between 3194 and <br /> ' 32 58 feet below the tops of well casings The ground water elevations in the wells screened across <br /> the water table were calculated to be between 19 86 feet (MW-5) and 19 56 feet (MW-3) below <br /> . mean sea level The ground water elevation data obtained during this monitoring event are depicted <br /> ' Advanced GeoEnvironmental,Inc <br />