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- n 5 1 II Y r - r Ir 07 March 2002 AGE-NC Project No 97-0312 I i ' Page 2 of 4 f After measuring ground water depths, monitoring well UST-1 was purged using a 2-inch Grundfos submersible purge pump Monitonng wells UST-2 through UST-6 were purged using new disposable plastic bailers Approximately 78 gallons of water were purged from UST-1 and approximately 6 to 11 gallons of water were removed from wells UST"2 through UST-6(a minimum of three casing-water volumes per well) Ground water was purged from near the top of the water column to remove water trapped within the unscreened Interval of the well casings Temperature, pH and conductivity of purged water were measured at regular Intervals during purging using an Oakton water analyzer The recorded field data and logs are included in Appendix B Purged water was stored on-site In 55-gallon DOT-approved drums pending laboratory analysis On 28 December 2001,the small and large domestic wells on-site were sampled for volatile organic compounds To purge the large domestic well, a drain valve was opened on the water storage tank ' The pump was allowed,to cycle on and off for approximately 15 minutes 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 ,A confirmation ground water sample was collected from the ` small domestic water well on 10 January 2001 h i , 2 3 COLLECTION OF GROUND WATER SAMPLES The depth to water was re-measured following purging to assure a minimum of 80%recharge prior ' to sampling Water samples were retrieved from each purged 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 three laboratory-supplied 40-m1 EPA- approved VOA,vlals,contalmng 0 5 ml of 18%hydrochloric acid as a sample preservative and Into one 1-liter amber bottle without preservative The ground water sample collected for confirmation from the large domestic water well was'collected Into three 40-m1'rVOA vials The samples were labeled, placed In a chilled container and transported under chain-of-custody to McCampbell Analytical Inc (MAI) in Pacheco, a Callforma Department of Health Servlces�(DHS)-certified analytical laboratory The samples were analyzed for kip w i • Total petroleum hydrocarbons quantified as gasoline �(TPH-g) and, diesel (TPH-d) In accordance with EPA Methods 5030/8015m and 3550/8015m, respectively, ,t, • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-- butyl 'ether , p 1 (MTBE) in accordance with EPA Method 8020, _ • Volatile organics and fuel oxygenates - MTBE, di-isopropyl ether (DIPE), ethyl tert-butyl F ether(ETBE), tert-amyl methyl ether (TAME) and tert-butanol (Ti In accordance with I, Advanced GeoEnvvonmental,Inc r {