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The stockpiled soil will be placed in 1-foot-thick lifts over the treatment cell liner to <br /> a height of approximately 5 feet. An air delivery system consisting of perforated <br /> PVC pipe will be installed in each treatment cell to aid in removing residual volatile <br /> organic chemical concentrations present in the soil. A 4-inch pipe will be placed at <br /> the bottom of the treatment cell with a set of three pipes placed at the top. The <br /> top pipes will be equipped with a one-way valve. When a vacuum is applied to <br /> the bottom pipe, air will flow through the one-way valve in the top pipes and <br /> through the soil to the bottom pipe. The vacuum extraction pipes from the various <br /> cells will be manifolded together such that the air will flow to an internal <br /> combustion engine. Each treatment cell is covered with 10-mil polyethylene <br /> sheeting to prevent uncontrolled air emissions of volatile organics during the <br /> remediation process. <br /> The treatment process takes approximately 12 weeks from the start of vacuum <br /> extraction. To verify that vacuum extraction has sufficiently reduced soil <br /> contaminant levels below the designated level for disposal, soil samples will be <br /> collected from the cell at the initiation of remediation and then monthly to monitor <br /> the remediation process. The samples will be analyzed for total petroleum <br /> hydrocarbons (TPH) as gasoline and benzene toluene, ethylbenzene, xylene <br /> (BTEX). Approval for final disposition of the material will be requested from <br /> S)CPHS. <br /> Upon verification that the soil in a cell has been adequately cleaned, the soil will <br /> be removed and disposed onsite in an appropriate waste cell or used as daily or <br /> intermediate cover. The piping, liner, and cover will be removed and, if possible, <br /> used for the next batch of soil. <br /> These treatment units may also be suited for other volatile organic compounds <br /> such as halogenated volatile aromatics, etc. <br /> 6.4.8.2 SLUDGE TREATMENT AND DISPOSAL METHODS <br /> The existing Forward Landfill is currently permitted to accept sludge for disposal. <br /> In order for Forward to accept sludge for disposal, one or more of the following <br /> forms and testing results must be submitted: <br /> Forward Landfill JTD 6-17 <br /> J:\Allied\Forward\JTD Amendment\March 2006 JTD-LEA Resp\)TDUTD Sec 6 Rev.doc: <br /> 5/22/02;Rev.1:7/2002:Rev.2:4/2003;Rev 3:6/2003;Amendment No. 1:5/22/2006 <br />