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� ¢ S APPENDIX VIII 4 . Reduction of Toxicity Mobility and Volume through Treatment All alternatives with the exception of Alternative #2, RCRA cap, would remove approximately 24, 387 pounds of VOCs from soil below 14 feet through the action of the SVE system. Alternative #3 assumes that 25% or 17, 950 pounds of VOCs in the upper layers would move into the lower layers and be treated. The mobility of contaminants in all soil layers would be reduced by the cap and slurry walls . The solidification Alternative #5 - #7, would reduce the toxicity, mobility and volume of both volatile organic and inorganic contaminants by heating the excavated waste to remove VOCs and then stabilizing the soil to encapsulate the inorganics, including lead. Approximately 99 . 99°s of the VOCs in the upper layers of soil would be destroyed through incineration, Alternative #4 . The incineration ash would be stabilized, thereby encapsulating the M lead. 5 . Cost See Table 5 . The total project - cost is the present value of capital costs and operation and maintenance costs . 6 . Short-term Effectiveness Alternative #2 would have the least short-term impacts on site workers and nearby residents and workers because there would be no excavation of the waste . All of the alternatives that have excavation components (Alternative #3 - #7) would have short-term impacts on the community and workers due to air emissions Air emissions would be controlled. generated during excavation. See Table 5 for estimated clean-up times . 7 . Imolementability All of the alternatives employ treatment technologies that have been proven effective in the field. Additionally, treatability studies performed on site waste showed that incineration and stabilization were effective in treating the contaminated soil . 42 - 11/16/95