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© crusher building (which is outside of the designated "Solid Waste Disposal Area") as shown on the Loadout Area Existing Structures Map, (Map 35) and an excavated pit in the Tipple Area as noted in the referenced response. The sub-grade portion of the crusher building would accommodate disposal of approximately 12,000 cubic feet (450 cubic yards) of solid waste material assuming a 4-foot placement thickness. Kerr has also identified an alternate disposal site which would consist of an excavated pit located above the Illinois River floodplain or potential AVF areas on private lands owned by Kerr south of and adjacent to the existing tipple access and haul road as shown on the Loadout Area Existing Structures Map, (Map 35). Relative to the alternate site, contacts with the Colorado Department of Public Health and Environment -Division of Hazardous Ma[erials and Waste Management indicate that since the source of the materials to be disposed of and the disposal site for those materials are private lands owned by Kerr, an exemption from the solid waste disposal facility permitting requirements under Section 1.4.1 of the Colorado Solid Waste Disposal Regulations (6 CCR 1007-2) would be applicable. In order to evaluate the disposal alternatives, Kerr first considered the required disposal volumes for the various materials. Based on the structural demolition information and volumes provided in the bonding calculations, the following materials and volumes resulting from Tipple Area demolition and reclamation activities will require disposal: Concrete Demolition Debris • Shop/Utility Building Slab - 3,770 frZ (to be retained for planned industrial postmining land use) • Crusher/Breaker Building Slab (Surface portion removed to depth of 3-feet) - 950 ft' • Baghouse Slab - 188 fr' • Switch House Slab - 100 ft' Eliminating the Shop/Utility Building Slab and assuming an average slab thickness of 6- inches and a material swell factor of 50 percent, the total volume of concrete demolition debris to be disposed of in the Tipple Area would be approximately 40 cubic yards. Steel Demolition Debris • Shop Utility Building - 45,240 fr' (to be retained for planned industrial postmining land use) • Crusher/Breaker - 52,500 fr' (will probably be sold for salvage) • Baghouse - 7,500 fr' • Tool Shack - 3,960 h' • Switchhouse - 2,000 h' • Train Loadout - 18,000 ft' • Conveyors - 8,125 h' (will probably be sold for salvage) • Fueling Scacion - 2,000 k' • Culverts - 620 h' Eliminating the Shop/Utility Building and given that all of the noted volumes are contained volumes, the associated facilities are primarily pre-fabricated steel frames and shells, and some of the facilities and/or equipment (crusher and conveyors) may be salvageable, the actual volume of steel demolition debris to be disposed of is conservatively estimated at 10 percent of the total contained volume or 350 cubic yards. IY^1ASl1A)~~y ~rt