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I <br />' Interim Corrective Action Plan <br /> 0} Frontier Transportation, Inc. <br />' December 20, 2005 <br /> Page 8 <br />' efficiency down Expensive shonng would be necessary to perform an excavation, and it is <br /> unlikely that the entirety of the contamination would be able to be removed by excavation in <br /> that area Soil vapor extraction (SVE) is comparable in price to ozone sparging However, <br />' SVE is not feasible at this site due to the high clay fraction in the soil, which would reduce <br /> the radius of influence and making SVE ineffective Ozone sparging would directly target <br /> the main contaminant problem at the site, which is MTBE migration The MTBE would be <br />' oxidized and oxygen levels would also be increased, stimulating microbial activity to <br /> attenuate TPH-gas and benzene levels, as well <br />' 6.0) RECOMMENDATIONS <br /> Based upon costs and method effectiveness, it is recommended that ozone sparging be <br /> implemented at the site for that period of time that would allow measurement of contaminant <br /> mass removal by the ozone infection process It is estimated that the ozone injection process <br /> be operated for a minimum of four quarters and evaluated quarterly for identification of <br />' containment of dissolved phased gasoline rmgration on the site down gradient western area <br /> and on the site eastern source area <br /> I <br />