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Thmdwell&Rollo <br /> • <br /> into areas of no current contamination, and of an increase in contamination in areas of known <br /> contamination. <br /> 4.4.2 ARAR Compliant <br /> All of the alternatives are, with the exception of the No Action Alternative and possibly the <br /> Monitoring Only Alternative, compliant with all ARARs and TBCs. <br /> 4.4.3 Long-Term Effectiveness <br /> All of the Treatment Alternatives are effective in the long-term, provided that adequate design, <br /> operation, and maintenance of the systems are provided. Air sparging and vacuum extraction are <br /> most effective for lighter volatile organics, such as gasoline and most chlorinated hydrocarbons, <br /> whereas ozone sparging and hydrogen peroxide injection work well for essentially all volatile <br /> • compounds. <br /> The Collection and Treatment Alternative should also achieve long-term effectiveness,typically <br /> requiring a longer time period than the treatment options described above. <br /> The No-Action and Monitoring Only Alternatives do not provide long-term effectiveness. <br /> 4.4.4 Short-Term Effectiveness <br /> Each of the four treatment alternatives would achieve relatively rapid short-term effectiveness. <br /> Collection and treatment of groundwater can take several months or years to achieve <br /> effectiveness, depending on the type and extent of contamination,the hydraulic characteristics of <br /> the soil, and number of extraction wells used. <br /> The No-Action and Monitoring Only Alternatives do not provide short-term effectiveness. <br /> • <br /> 35 <br /> 25970318.PGS 15 November 2000 <br />