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and toluene are observed to be removed with field attenuation coefficients of five <br /> days or less, for reduction to one-half concentration Benzene, ethylbenzene, and <br /> xylenes exhibit half-lives of seven to nine days The adsorbed soil fractions of <br /> MTBE are less than0 those of benzene fractions MTBE removal occurs <br /> 1 primarily from aqueous fraction <br /> 1 REFERENCES <br /> Bader, H and J Hoigne 1982 "Determination of Ozone in Water by the Indigo <br /> Method A Submitted Standard Method Ozone Science & Engineering 4 169- <br /> 176 <br /> Karpel vel Leitner, R N K V , A L Papaslhou, J P Crove, J Payrot, and M <br /> 1 Dore 1994 "Oxidati0on of Methyl Tert-Butyl Ether (ETBE) by Ozone and <br /> Combined Ozone/Hydrogen Peroxide ' Ozoiie Science & Engineering 16 41- <br /> 64 <br /> 1 Kerfoot W B 1994 "Soil Gas Movement — Monitoring Under Natural and <br /> Remediation Conditions " In D I Wise and D J Trantolo (Eds ), Remediation of <br /> ' Hazardous Waste Contaminated Soils, pp 791-828 Marcel Dekker, Inc , New <br /> York, New York <br /> Kerfoot, W B 1997 "PCE Removal from Groundwater with Dual Gas <br /> Microporous Treatment System " Soil and Groundwater Cleairirp, October ed , <br /> Kerfoot, W B , C J J M Schouten, and V C M van Engen-Beukeboom 1998 <br /> "Kinetic Analysis of Pilot Test Results of the C-SpargO_1`1 Process " In G B <br /> ' Wickramanayake and R E Hinchee (Eds ), The Proceedings of the Physical, <br /> Chemical arrd Thermal Technologies, Remediation of Chlorinated and <br /> Recalcitrant Compounds, Vol C 1-5, pp 271-277 Battelle Press, Columbus, <br /> 1 Ohio <br /> 1 Reisinger, H J , D R Bums, L R Cessar, and G D McCleary 1986 "Factors <br /> Affecting the Utility of S00oil Vapor Assessment Data" Proceedings of <br /> Petroleum Hydrocarbons mid Organic Chemicals in Groundwater Prevention, <br /> Detection, and Restoration, Houston, Texas, November 12-14 Water Well <br /> Journal Publishing Co , Dublin Ohio <br /> 1 Sufiita, J M and M R Mormile 1993 "Anaerobic Biodegradation of Known <br /> and Potential Gasoline Oxygenates in Terrestrial Subsurface" Environmental <br /> Science & Technology 27 976-978 <br /> i <br /> 1 <br />