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23 September 2002 <br /> AGE-NC Project No 95-0128 <br /> IPage 2 of 7 <br /> On 14 and 15 May 2002, a minimum of 3 casing-water volumes were purged from each well to be <br /> sampled using a PVC submersible two-stage pump or disposal bailer or the wells were purged dry <br /> as occurred in well MW-9 after 3 gallons were removed Temperature, pH and conductivity of <br /> purged ground water were measured at various intervals,depending on the volume of water in each <br /> well,using an or Oakton water analyzers The field data and field sheets are included in Appendix A <br /> Purged water was discharged into the active ground water treatment system for disposal Following <br /> I purging, the depth to ground water was measured to ensure that a minimum of 80% well-volume <br /> recharge had been achieved prior to sampling, except well MW-9 <br />' 22 GROUND WATER SAMPLE COLLECTION <br /> IA water sample was collected from each well using a dedicated plastic bailer Immediately upon <br /> retrieval, the samples were transferred into three 40-milliliter(ml) EPA-approved volatile organic <br /> analysis (VOA) vials containing 0 5 ml 18%hydrochloric acid (sample preservative) and into one <br /> I1-liter amber bottle without the preservative The samples collected were logged on a chain-of- <br /> custody form, placed in a chilled container and transported to McCampbell Analytical Inc (MAI), <br /> a California Department of Health Services (DHS)-certified laboratory in Pacheco, California, for <br /> lie analysis The ground water samples were analyzed for <br /> I • Total petroleum hydrocarbons quantified as gasoline and diesel(TPH-g and TPH-d)by EPA <br /> Method 8015 Modified, <br /> • Benzene,toluene,ethyl benzene and xylene(BTEX)and methyl-tertiarybutyl ether(MTBE) <br /> by EPA Methods 8020, and <br /> • The oxygenated compounds di-isopropyl ether (DIPE), ethyl tertiary-butyl ether(ETBE), <br /> methyl tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol <br /> (TBA),methanol, ethanol,ethylene dibromide(EDB) and 1,2-dichloroethane(1,2-DCA) in <br /> accordance with EPA Method 8260 Modified <br /> I <br /> 3.0. INTERIM REMEDIATION PROCEDURES <br />■ <br /> Between 22 April 2002 and 06 June 2002, an interim ground water pump-and-treat system was in <br /> continuous operation at the site, interim ground water pump-and-treat operation and maintenance <br /> procedures for the site were outlined in Monitoring Well Installation and Interim Ground Water <br /> Remediation <br /> IAdvanced GeoEnvironmental Inc <br />