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APPENDIX VIII <br /> Following construction of the slurry wall, the site will be <br /> graded and all contaminated canal sediments will be excavated and <br /> spread over the site . It is estimated that approximately 500 <br /> cubic yards of sediment will require excavation. The western 2/3 <br /> of the site is 3 to 5 feet above the surrounding land due to the <br /> rubble used to fill the former waste pits . Approximately 8, 600 <br /> cubic yards of imported soil will be used as fill material for <br /> the eastern 1/3 of the site. Foam will be applied during <br /> excavation and spreading of the canal sediment to control <br /> emissions . The entire length of the canal along the southern <br /> boundary of the site will then be enclosed in a reinforced <br /> concrete pipe . <br /> The 6 . 8 acre site will then be covered with a cap capable of <br /> satisfying the requirements under RCRA Subtitle C for closure of <br /> a hazardous waste landfill . The cap should consist of a one foot <br /> foundation layer containing a gas collection system, two feet of <br /> bentonite/clay mix, a high density polyethylene (HDPE) liner, <br /> 1/12 feet of sand containing a drainage collection system, <br /> followed by two feet of top soil . <br /> The gas collection system will deliver gases to a treatment <br /> system. The system will include a scrubber to remove sulfur <br /> dioxide (SO2) and a carbon absorber to remove VOCs . <br /> For SO2 removal, the treatment system will be designed for one <br /> scrubber to achieve a 95 percent SO2 removal efficiency. <br /> Scrubber blcwdown, generated at an estimated rate of 16 gallons <br /> per day, will be shipped offsite for disposal . <br /> 44 - 11/16/95 <br />