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' 18 October 2002 i AGE-NC Project No 95-0128 IPage 2 of 7 On 14 and 15 August 2002, a minimum of 3 casing-water volumes were purged from each well to be sampled using a PVC submersible two-stage pump or disposal bailer, except for well MW-9, which was purged dry after three gallons of water were removed Temperature,pH and conductivity of purged ground water were measured at various intervals, depending on the volume of water in each well, using an or Oakton water analyzers The field data and field sheets are included in Appendix A Purged water was discharged into the active ground water treatment systern for I disposal Following purging, the depth to ground water was measured to ensure that a minimum of 80% well-volume recharge had been achieved prior to sampling 2 12 Ground Water Sample Collection IA water sample was collected from each monitoring well using a new disposable bailer after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume hnmediately upon retrieval, the samples were transferred into three 40-milliliter (ml) EPA-approved volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid (sample preservative) and into one 1-liter amber bottle without the preservative The samples collected were logged on a chain- of-custody hain- of-custody form,placed in a chilled container and transported to McCampbell Analytical Inc (MAI), a California Department of Health Services(DHS)-certified laboratory In Pacheco,for analysis The ground water samples were analyzed for I • Total petroleum hydrocarbons quantified as gasoline and as diesel (TPH-g and TPH-d) by EPA Method 8015 Modified, • Benzene,toluene,ethyl benzene and xylene(BTEX)with methyl-tertiarybutyl ether(MTBE) by EPA Methods 8020, and • The oxygenated compounds di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), Imethyl tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA),methanol,ethanol, ethylene dibromide(EDB) and 1,2-dichloroethane(1,2-DCA) in accordance with EPA Method 8260 Modified 22 INTERIM REMEDIATION Between 05 June and 15 August 2002, an interim ground water pump-and-treat system was in continuous operation at the site, interim ground water pump-and-treat operation and maintenance procedures for the site were outlined in Monitoring Well Installation and Interim Ground Water Remediation i Advanced GcoEnvironmental Inc I