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UP ' 19 January 2006 AGE-NC Project No 97-0312 ' Page 2 of 4 off for approximately 15 minutes The small domestic well was out of service,the electrical service has been disconnected and the distribution piping was truncated and capped f, ' 22 COLLECTION OF GROUND WATER SAMPLES ' The depth to water in the monitoring wells was re-measured following purging to assure a mimum of 80%recharge prior to sampling Water samples were retrieved from each purged monitoring well using a Waterra inertial pump To sample the large domestic well, a sampling port was opened at the ' well head and samples were collected from the port while the pump was operating Each sample was transferred into three laboratory-supplied 40-milliliter(ml)EPA-approved volatile organic analysis s (VOA)vials containing 0 5 ml 18%hydrochloric acid solution as a sample preservative,and into one ' 1-liter amber bottle without preservative The samples were labeled, placed in a chilled container, and transported under chain of custody to ' Cal Tech Environmental Laboratories(CTEL), a California Department of Health Services(DHS)- certified analytical laboratory, for analysis The samples were analyzed for ' •E a Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in accordance with EPA Method 8015M, and 0 Benzene,toluene,ethylbenzene,and total xylenes(BTEX)and the fuel additives dl-isopropyl ether(DIPE),ethyl tertiary-butyl ether(ETBE),methyl tertiary-butyl ether(MTBE),tertiary- amyl methyl ether(TAME),tertiary-butanol (TBA), methanol, ethanol, 1,2-dibromoethane ' (EDB), 1,2-dichloroethane (1,2-DCA),trichloroethane (TCE) and tetrachloroethane(PCE) in accordance with EPA Method 8260B 3.0. FINDINGS ' Ground water elevations were determined by subtracting the measured depths to ground water from the surveyed casing elevations(Table 1) Ground water flow direction was determined by contouring ' the water elevations on a scaled site plan (Figure 3) Hydrocarbon-impact to ground water was assessed by laboratory analysis and field observations r ' 3 1 GROUND WATER ELEVATION AND GRADIENT x ' Depths to ground water at the site ranged from 62 84 feet to 63 88 feet below the tops of the well casings The ground water elevations in wells UST-2 through UST-6 ranged between 34 73 feet IAdvanced GeoEnvnronmentsl,Inc I '