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r 22 July 2002 ' AGE-NC Project No 97-0312 I Page 2 of 5 - , F J The small on-site domestic well was purged and sampled on 08 May 2002, and both the small and large on-site domestic wells were purged and sampled on 10 June 2002 To purge the small domestic well, a faucet between the well and the water holding tank was opened to allow the pump to cycle for approximately 15 minutes To purge the large domestic well, a drain valve was opened on the water storage tank and the pump was allowed to cycle on and off for approximately 15 minutes N ` 1 I2 2 COLLECTION OF GROUND WATER SAMPLES ' The depth to water in the monitoring wells was re-measured following purging to assure a minimum of 80%recharge prior to sampling Water samples were retrieved from each purged monitoring well using new disposable bailers and an equipment blank was collected from the discharge hose of the ' 2-inch submersible purge,pump following decontamination To sample the domestic wells, a sampling port was opened at the well head and samples were collected from the sampling port while the pump was operating to obtain fresh water samples Each sample was transferred into four laboratory-supplied 40-m1 EPA-approved VOA vials containing 0 5 ml of 18% hydrochloric acid as a sample preservative and into one 1-liter amber bottle without preservative 10M The samples collected on 10 June 2002 were labeled, placed in a chilled container and transported under chain-of-custody to McCampbell Analytical Inc (MAI), a California Department of Health IServices (DHS)-certified analytical laboratory in Pacheco The samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in ' accordance with EPA Methods 5030/8015m and 3550/8015m, respectively, • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether (MTBE) in accordance with EPA Method 8021, ' The fuel oxygenates MTBE, di-isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME) and tertiary-butanol (TBA) in accordance with EPA ' Method 8260B, and ' • Halogenated volatile organic compounds(HVOCs) in accordance with EPA Method 8010 IThe sample collected on 08 May 2002 from the small domestic well was labeled,placed in a chilled container and transported under chain-of-custody to Cal Tech Environmental Laboratories(CTEL), ' a CaliformaDepartment of Health Services(DHS)-certified analytical laboratory in Paramount The sample was analyzed for volatile organic compounds in accordance with EPA Method IAdvanced GcoEnvironmental,Inc