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TABLE 3-4 CONTD. COMPARISON OF GROUNDWATER REMEDIATION <br /> TECHNOLOGIES <br /> TechnologyDescription <br /> Advantages Disadvantages <br /> Groundwater Plume control by Prevents off-site Requires knowledge of <br /> Contamination installation of a series migration of the extent of <br /> -{ � Control On-Site of hydraulic contaminants Separates contamination and flow <br /> 'treatment <br /> bamers(e g. slurry wall, contaminated and non conditions Physical <br /> etc.) to retard contaminated barriers are very <br /> contaminant migration groundwater. Isolated expensive, and subject <br /> groundwater quality can to weathering Long- <br /> be improved by term maintenance and <br /> naturally occurring inspection casts <br /> bioremediation expected Difficult to <br /> monitor the <br /> effectiveness of <br /> naturally occurring <br /> remediation process <br /> 3.3.2 Applicable Remedial Technologies <br /> Based on the preliminary comparison of remedial technologies presented in Tables 3-3 <br /> and 3-4, groundwater extraction and vapor extraction are the alternatives to mitigate <br /> migration of contaminated groundwater plume are applicable at the 102 S Wilson Way <br /> site <br /> 3.3.3 Remedial Action Plan <br /> As described above, the remedial options most applicable to the 102 S. Wilson Way site <br /> are dual groundwater and vapor extraction as the preferred remedial alternatives High <br /> vacuum dual extraction combines elements of these activities Dual extraction removes <br /> contaminated groundwater and volatalizes contaminated soil in the unsaturated zone and <br /> capillary fringe Eiodegradation is enhanced through the addition of nutrients to the <br /> groundwater. For this estimate, we assume that the Knowles will implement dual <br /> extraction We estimate cleanup will take about 3 years. <br /> Estimates of capital, and operating and maintenance costs for the installation and long <br /> term maintenance of groundwater extraction is summarized in Table 3-5. <br /> 15 <br />