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03 September 2004 <br /> AGE-NC Project No 97-0312 <br /> I <br />' Page 2 of 5 a <br /> k <br /> In addition, the large on-site domestic well was purged and sampled on 29 April and 03 June 2004 <br />' To purge the large domestic well, a drain valve was opened orilhe water storage tank and the pump <br /> was allowed to cycle on and off for approximately 15 minutes The small domestic well was out of <br /> service,the electrical service was disconnected and the distribution piping was truncated and capped k - <br /> I2 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 />' 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 sampling port while the pump was operating to <br /> Iobtain fresh water samples Each sample was transferred into four laboratory-supplied 40-m1 EPA- <br /> approved volatile organic analysis (VOA) vials containing 0 5 ml of 18% hydrochloric acid as a <br /> sample preservative and into one 1-liter amber bottle without preservative <br /> The samples were labeled, placed in a chilled container and transported under chain of custody to <br />' McCampbell Analytical Inc (MAI), a California Department of Health Services (DHS)-certified <br /> analytical laboratory In Pacheco The samples were analyzed for <br /> Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br />' accordance with EPA Methods 5030/8015m and 3550/8015m, respectively, <br /> - Benzene, toluene, ethylbenzene and total xylenes (BTEX) and the fuel additives methyl <br /> tertiary-butyl ether(MTBE) in accordance,with EPA Method 8021B, <br /> - Fuel additives including di-isopropyl ether(DIPE),ethyl tertiary-butyl ether(ETBE),MTBE, 1 <br />' tertiary-amyl methyl ether(TAME)„tertiary-butanol(TBA), 1,2-dlbromoethane(EDB)and <br /> 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B, and <br /> - Halogenated volatile organic compounds(HVOCs)in accordance with EPA Method 8260B f <br />' 3.0. FINDINGS s i <br /> Ground water elevations were determined by,subtracting the measured depths-to-water from the - <br />' surveyed casing elevations (Table 1) Ground water flow direction was detennined by contouring <br /> the water elevations on a scaled site plan (Figure 3) Hydrocarbon-impact to ground water was <br /> assessed by,laboratoryanalysis and field observations <br /> I <br /> Advanced CeoEnvironmental,Inc <br /> I <br />