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Quik Stop Station No 39 September 23,2005 Stockton California Results of Additional Subsurface Invests anon Selected soil samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg), • the volatile aromatic compounds benzene, toluene, ethylbenzene and xylenes (BTEX), methyl-t-butyl ether (MTBE), diisopropyl ether (DIPE), ethyl-t-butyl ether (ETBE), tert- amyl methyl ether (TAME), tert-butanol (TBA) methanol and ethanol (seven fuel oxygenates), DCA and 1,2-dibromoethane (EDB) by EPA Method 8260B The stockpile samples were combined into one composite sample and analyzed for TPHg and BTEX by EPA Method 8260B and for total lead by EPA Method 6010 Soil analytical reports are contained in Appendix E Horizon developed and sampled monitoring wells MW-5 and MW-6 on November 17 and monitoring well MW-4 on November 30, 2004 Well development water was contained in Department of Transportation-approved, 55-gallon drums for temporary on-site storage pending characterization and disposal Monitoring well development and purge data were recorded on monitoring well data sheets contained in Appendix F Groundwater samples were submitted, under chain-of-custody documentation, to Kiff for analysis of TPHg, BTEX, the seven oxygenates, DCA and EDB by EPA Method 8260B Groundwater analytical reports are contained in Appendix D On November 17, Horizon disposed the development water to InStrat, Inc in Rio Vista On November 19, 2004, Horizon disposed the drill cuttings stockpile to the Sacramento County Kiefer Landfill facility Soil and water disposable documents are contained in Appendix G Horizon retained Virgil Chavez Land Surveying to survey the horizontal coordinates and the top-of-casing elevation of the monitoring wells MW-4, MW-5 and MW-6 to GeoTracker specifications The survey was completed on November 23, 2004 The surveyor report is contained in Appendix H 7039rpt9 05 Project No 7039 16 5 HORIZON ENVIRONMENTAL INC