4.1.1 Description of CTF and Landfill This FS discusses how an alternative treatment technology can be implemented if the CTF is located at the proposed incinerator site and the disposal facility is located at the proposed ash disposal location. Other locations for the CTF and the disposal facility may also be considered during the design phase. The proposed CTF and disposal facility are discussed below. 4.1.1.1 Proposed Central Treatment Facility The proposed CTF site (see Figure 4-1) is located approximately 2.5 miles southwest of the corporate limits of the City of Bloomington in Perry Township, Monroe County, Indiana. This 15-acre site is bordered on the east by Indiana State Highway Route 37; on the northwest by the Illinois Central Railroad; and on the south by the City of Bloomington's Dillman Road Wastewater Treatment Plant. Approximately 10 to 12 acres are available at the site for the treatment building, accessory structures, and roadways. The local environment consists generally of rolling hills, pasturelands, and fallow bottomland. Land northwest of the site is primarily zoned for residential use. The 10- to 12-acre site is zoned industrial. Land north and northeast of the site is zoned for residential use to the boundary of the City of Bloomington's 2-mile planning fringe. North of this city line and within the 1-mile ring of the proposed CTF are quarrying zones, residential estate districts, low-density multidwelling units, and high-density residential districts. Throughout these zones, more restrictive flood hazard overlay districts are present, including urban floodway, rural floodway, and floodway fringe districts. The CTF is proposed to be constructed entirely within the industrially zoned portion of its proposed location. The only access to the treatment site should be from Indiana State Highway Route 37 by means of a commercial driveway that should be constructed pursuant to a permit issued by INDOT. A de-acceleration lane should be constructed on Route 37 to prevent interference by refuse trucks or other CTF-related traffic with current traffic patterns. On-site roads should be 24 feet wide and constructed to provide for two lanes with two-way traffic. An 8-foot-high, galvanized, chain-link fence topped by three strands of barbed wire should enclose the facility. Card- controlled gates should limit access to the CTF to individuals provided with cards. Those without access cards would be admitted on a case-by-case basis by the facility security officer. The site is currently undeveloped and has no existing utilities. Water, electric, sewer, gas, and telephone utilities are available in the area. Figure 4-1 PROPOSED CENTRAL TREATMENT FACILITY 4.1.1.2 Proposed Disposal Facility The proposed disposal facility (see Figure 4-2) should be a dedicated disposal facility for the treated materials from the CD sites. The property acquired by Westinghouse for the disposal facility has an area of 247 acres, 70 acres of which could be fenced and used for the disposal of wastes from the remedial activities. Westinghouse has proposed to design and construct the landfill in accordance with requirements of RCRA and State of Indiana hazardous waste laws and regulations. The proposed disposal facility includes a landfill cell consisting of four subcells for disposal of waste materials and ancillary facilities. The landfill could be constructed in three phases. Phase I would involve constructing the southwest and northwest subcells and filling the southwest cell first. Phase II would involve constructing the northeast subcell when the northwest subcell is almost full. Phase III would involve constructing the southeast subcell when the northeast subcell is almost full. Each subcell should have a double liner designed to exceed the design requirements of 40 CFR 264 and EPA's Minimum Technology Guidance on Double Liner Systems for Landfills and Surface Impoundments--Design, Construction and Operation. Each liner system should be a composite system consisting of a compacted soil liner and a geomembrane. The composite liner system closest to the waste is termed the "primary liner," and the composite liner system below the primary liner is the "secondary liner." The leak detection system (LDS) should be placed between the primary and secondary composite liners. Each subcell should have an independent leachate collection and removal system (LCRS) and LDS. The LCRS should be placed above the primary liner and be designed to efficiently remove leachate from the landfill cell and to minimize the hydraulic head on the primary liner. The LCRS should convey leachate to an LCRS sump in each subcell. If a leak through the composite primary liner occurs, the LDS should be designed to provide minimum detection time, enabling fluid entering the system to reach one of the sumps in less than the EPA-required 24 hours from any location in any subcell. Figure 4-2 PROPOSED DISPOSAL FACILITY Leachate collected from the LCRS or LDS sumps should be pumped through an underground force main to an on-site wastewater treatment plant. The underground force main should be provided with secondary containment, witness vaults for leak detection, and backflow prevention valves. A runon control system should be designed to intercept natural surface water flow upstream of the landfill cell and divert the flow around the cell. Runon control ditches should be placed as close as possible to the uphill edge of the landfill cell and related facilities. Runon at the northern portion of the landfill cell could be routed toward the unnamed stream paralleling Lawson Road. Runon at the southern portion of the landfill cell could be routed to existing culverts passing under Bottom Road. The ditches should be protected with an erosion- resistant lining material. A runoff control system should be constructed to collect surface water from the final cover surface that has not been in contact with the waste and direct it through erosion-resistant ditches and flumes to the sediment basins. Collection and holding facilities for drainage control should be designed to manage a 25-year, 24-hour storm event. Runoff from the final cover and runon from disturbed areas during various phases of the construction and operation of the landfill cell would be directed to two sediment basins. The flows that accumulate in the sediment basins would be released gradually after storms in accordance with NPDES requirements. Water from precipitation that passes through or over the fill material is considered leachate and should be processed in the wastewater treatment plant. The treated water would be required to meet the NPDES permit limits for discharge and may be pumped into a ditch that outlets into Beanblossom Creek at a controlled rate. Other ancillary features of the disposal facility may include the following: Operations buildings Security fence Maintenance shop Wheel wash station Sanitary treatment plant The permanent roads in the waste handling area are proposed to consist of the main access road off Bottom Road and the road on the surface of the final cover. A permit for commercial driveway approach may not be required from INDOT because access to the landfill would be from a county road. Prior to any alteration to Bottom Road associated with landfill access, approval from the Monroe County Commissioners should be obtained. The permanent roads should be designed in accordance with American Association of State Highway and Transportation Officials (AASHTO) pavement design methods.