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1 <br />' 26 September 2002 <br /> AGE-NC Project No 95-0173 <br />' Page 2 of 8 <br />' conductivity ofpurged water were measured from each well for stabilization at regular purge-volume <br /> Intervals either using an Oakton water analyzer or a Hydac water analyzer Field data and logs are <br /> Included in Appendix A Purged groundwater was containerized in 5 5-gallon drums and was stored <br /> on-site in an area lacking general public access <br />' 2 2 GROUND WATER SAMPLING <br /> Following well purging,ground water levels In the wells achieved a minimum of 80 percent recharge <br />' prior to sample collection Subsequently,groundwater samples were collected from the purged wells <br /> utilizing new,disposable polyethylene bailers and transferred Into 40-m1 EPA-approved VOA vials <br /> containing 0 5 ml 18% hydrochloric acid as a sample preservative Care was taken to ensure that <br />' visible air bubbles were not present in the vials after filling and capping Ground water sample <br /> containers were labeled with the well designation, date, time, and sampler's initials <br /> I <br /> 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> After labeling,each ground water sample was logged on a chain-of-custody form,placed in a chilled <br /> container and transported to a California Department of Health Services(DHS)-certified laboratory <br /> to be analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Methods <br /> I5030/8015M, <br /> • Benzene,toluene,ethylbenzene and xylene(BTEX)and methyl tertiary-butyl ether(MTBE) <br /> I by EPA Method 8020, and <br /> • MTBE, tert-amyl methyl ether(TAME), tertiary butanol(TBA), di-isopropyl ether(DIPE), <br /> ethyl tert butyl ether(ETBE), 1,2-dichloroethane(1,2-DCA)and ethyl ene-dibromide(EDB) <br /> by EPA Method 8260 Modified <br /> Jl.V. ill{. V 1'lYOR EXTRACT T ION/11-SITU Al 't SPARGE SYSTENII <br /> I Between 11 March 2002 and 11 June 2002, SVE remediation was in continual operation at the site, <br /> utilizing a Solleco Ecat 250 catalytic converter vapor extraction system to apply an induced vacuum <br /> to wells VW-1 through VW-7, during this time, IAS remediation also continued, with air sparging <br /> Ithrough wells MW-1 through MW-3 and AW-1 through AW-7 SVE and IAS procedures for the site <br /> Advanced Geo Environmental,Inc <br />