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AM- . RY x <br /> Woodward-Clyde Consultailts <br /> Table 7 Continued <br /> Advantages Disadvantages <br /> Technology Description <br /> Tilling of hydrocarbon- Allows treatment of Is a low cost alternative <br /> Land T_fILMeM containing soil with the contaminated soil with only for accessible Y <br /> addition of nutrients to minimal disturbance to contamination.on <br /> Hydrocarbon- <br /> stimulate biological Caltrans operations. �n;i ng soils at depth <br /> degradalion_ below the immediate <br /> ground surface must be <br /> excavated. <br /> Hydrocarbons remain in <br /> soil while treatment There <br /> is <br /> progressing. <br /> remains a potential for <br /> leaching. However, this <br /> potential is reduced by <br /> seasonal dry cycles. Air <br /> emission, standards <br /> must be considered. <br /> Excavation of Removes contamination Requires soil <br /> Off-site from the ;;nitrons Shop excavation. Caltrans <br /> m r ' I n :til hydrocarbon containing will continue to <br /> soil. Transport to and 10 facility. Red-ices maintain liability for <br /> a at <br /> osai <br /> dis chances of future <br /> p '" the disposed soil even <br /> commercial landl It. groundwater though it is in a landfill. <br /> contamination. Uses up limited landfill <br /> capacity. High cost of <br /> disposal and liabfiily of <br /> transportation. Serious <br /> disrupter n to present <br /> site activities. Air <br /> emission standards <br /> must be considered. <br /> In Situ fJaturally Hydrocarbon Has demonstrated track Limited success in areas <br /> ion through record of effectiveness. of high contaminant <br /> degradation No disruption cf on. concentrations. <br /> natural ion thng will <br /> #q going site operations. Degradation r be <br /> microflora. <br /> slow when hydraulic <br /> conductivity is low. It <br /> is difficult to monitor. <br /> or control the process. } <br /> 20 <br />