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.« <br /> S <br /> Ox,2 <br /> ^r... <br /> ' ' lr <br /> 10 December 2004 <br /> ' <br /> ' AGE-NC Project No 97-0312 <br /> Tage 2 of 4 <br /> 'In addition, the large on-site domestic well was purged and sampled To purge the large domestic <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 /> was disconnected and the distribution piping was truncated and capped _ ' <br /> E <br />' 2 2 COLLECTION OF GROUND WATER SAMPLES <br /> The depth to water In the monitoring wells was re-measured following purging to assure a minimum <br />' 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 /> wellhead and samples were collected from the port while the pump was operating Each sample was <br />' transferred into four 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 Analytical Laboratories,Inc (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 /> taccordance with EPA Method 8015M, and , I <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 /> 4 amyl methyl ether (TAME), tertiary-butanol (TBA), 1,2-dibromoethane (EDB), 1,2- <br /> dichloroethane (1,2-DCA); ethanol, and methanol in accordance with EPA Method 8260B" <br /> I <br /> 1 1 1 <br /> 3.0.' FINDINGS <br /> 1 <br /> I <br /> Ground water elevations were determined by subtracting the measured depths,to groundwaterfrom <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 /> 1 <br /> ! r Advanced GeoEnvironmental,Inc F <br /> I <br /> 1 f <br /> I 1 I y <br /> I <br /> 11 I I <br />