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Treadwell&Rollo <br /> • <br /> The No-Action alternative does not provide long-term effectiveness. <br /> 4.2.4 Short-Term Effectiveness <br /> On-site containment via capping or excavation and relocation on-site is effective in the short- <br /> term provided that the work is performed quickly, with appropriate engineering controls. Efforts <br /> must be made during the fill, excavation and relocation activities to control dust generation and <br /> migration, worker and neighbor exposures to contaminated soil, and potentially-contaminated <br /> runoff. <br /> Source area removal is effective as a short-term remediation alternative as this action removes <br /> the contaminated soil from the site. As with the containment option, appropriate health and <br /> safety procedures must be followed to minimize worker exposure to contamination, and the <br /> possibility of off-site migration. <br /> • Biodegradation can be effective in the short-term, but is generally considered a moderate-to-long <br /> term alternative. Vacuum extraction can by very effective in the short-term. <br /> The No-Action alternative does not provide short-term effectiveness. <br /> 4.2.5 Reduction of Toxicity/Mobility/Volume <br /> On-site containment provides a reduction in contaminant mobility by isolating the contaminated <br /> soil from the environment. Properly designed and constructed, either of the containment options <br /> (capping in place, or on-site relocation and capping) will effectively prevent contaminants from <br /> migrating as runoff or as solubilized chemicals or metals. Containment does not provide any <br /> reduction in toxicity or volume. <br /> Source area removal provides on-site reduction in toxicity, mobility, and volume. However, <br /> volume and toxicity is transferred to the waste management unit that accepts the contaminated <br /> • soil, rather than providing an actual reduction in the toxicity or volume. <br /> 24 <br /> 25970318.PGS 15 November 2000 <br />