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• <br /> 7kedweII&ROD <br /> Both biodegradation and vacuum extraction reduce toxicity, mobility, and volume. Carbon used <br /> in vacuum extraction may require offsite recycling and disposal. Thermal oxidation is another <br /> method to treat effluent from vapor extraction that does not generate waste. <br /> The No-Action alternative does not provide any reduction in toxicity,mobility, or volume. <br /> 4.2.6 Implementability <br /> The on-site containment option is implementable,provided that the site development plans take <br /> this into account early in the design phase. If capping is to be used, the site grading plan must <br /> consider that initial grading and fill implacement will require working in potentially <br /> contaminated soil. Grading permits may contain conditions specific to working with potentially <br /> contaminated soil. Post-grading activities, such as trenching for utilities, must consider the <br /> possibility that contaminated soil may be encountered. Deed restrictions and maintenance of the <br /> • cap will be required. <br /> The on-site excavation, relocation, and capping of contaminated soil is implementable. As with <br /> the capping option,proper planning is critical to successful implementation and deed restrictions <br /> will be required. The site grading plan must be tailored to manage the work, and building <br /> foundation plans may require alterations to deal with the emplacement of potentially <br /> contaminated soil beneath footings, between grade beams, and under slabs. <br /> Biodegradation requires no special equipment, using wells for nutrient addition and monitoring. <br /> Vacuum extraction requires a series of wells connected to below-grade piping and a surface <br /> treatment facility. While generally small, the blower may produce excessive noise requiring <br /> special muffling. This alternative is implementable. <br /> The No-Action alternative is implementable. <br /> • <br /> 25 <br /> 25970318.PGS 15 November 2000 <br />