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16 January 2006 <br /> AGE-NC Project No 97-0312 <br /> _ Page 2 of 4 <br /> well, a drain valve was opened on the water storage tank and the pump was allowed to cycle on and ' <br /> off for approximately 15 minutes The small domestic well was out of service,the electrical service <br /> has been disconnected and the distribution piping was truncated and capped <br /> 22 COLLECTION OF GROUND WATER SAMPLES <br /> The depth to water in the monitoring wells was re-measured following purging to assure a minimum <br /> of 80%recharge prior to sampling Water samples were retrieved from each purged monitoring well <br /> using a Waterra inertial pump To sample the large domestic well,a sampling port was opened at the <br /> well head and samples were collected from the port while the pump was operating Each sample was <br /> transferred into three laboratory-supplied 40-milliliter(ml)EPA-approved volatile organic analysis <br /> (VOA)vials containing 0 5 ml 18%hydrochloric acid solution as a sample preservative,and into one <br /> 1-liter amber bottle without preservative <br />' The samples were labeled, placed in a chilled container, and transported under chain of custody to <br /> Cal Tech Environmental Laboratories(CTEL), a California Department of Health Services(DHS)- <br /> certified analytical laboratory, for analysis The samples were analyzed for <br />' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Method 8015M, and <br /> • Benzene,toluene,ethylbenzene,and total xylenes(BTEX)and the fuel additives di-isopropyl <br /> ether(DIPE),ethyl tertiary-butyl ether(ETBE),methyl tertiary-butyl ether(MTBE),tertiary- <br /> amyl methyl ether (TAME), tertiary-butanol (TBA), 1,2-dibromoethane (EDB) and <br /> 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B <br /> 1 ! <br /> 3.0. FINDINGS <br /> rGround water elevations were determined by subtracting the measured depths to ground water from <br /> the surveyed casing elevations(Table 1) Ground water flow direction was determined by contouring <br />' the water elevations on a scaled site plan (Figure 3) Hydrocarbon-impact to ground water was <br /> assessed by laboratory analysis and field observations <br />' 3 1 GROUND WATER ELEVATION AND GRADIENT <br />' Depths to ground water at the site ranged from 64 33 feet to 65 32 feet below the tops of the well <br /> casings The ground waters elevations in wells UST-2 through UST-6 ranged between 36 31 feet <br /> 1. <br />' Advanced GeoEnvironmental,Inc <br /> 1 , <br />