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Disposal - ALL portions of each structure removed by the CONTRACTOR u no taken as salvage shall be disposed of within the East Mine working area limits or hauled to and placed within the excavated trench at the Hawk's Nest Mine refuse disposal area located adjacent to the Delta County Landfill site near Hotchkiss, The location of the disposal area is shown on attached Exhibit 5. On-site disposal shall consist of either backstowing non-combustible materials within the two open mine entries and/or by burying demolished materials at the based of areas to be backfilled during regarding work, ALL items backstowed within the two mine entries shall be non-combustible and shall be placed beyond the earth material backfill areas specified for the mine entry sealing and backfilling work under Section II1,3 of the Special Conditions, Disposal of demolished portions of structures by burial within areas to be backfilled shall be accomplished by stacking or otherwise piling the material of the base of the area to be backfilled and in the region where the height of the fill will be greatest, A graphic representation of this method is shown on attached Exhibit 4C. In most cases these areas will be along the toe of existing hill or bench slopes and in the bottom of existing sediment ponds, Demolished materials shall be placed in such a manner that prevents the formation of slippage surfaces between disposed items and earth fill material. Buried materials shall be placed a minimum of 4 feet below final regraded surfaces (measured vertically), and in no case shall buried material other than concrete be piled or placed within the fill higher than 30% of the vertical distance between the existing surface elevation and the final regraded surface elevation. When authorized or permitted by the proper fire authorities, the CONTRACTOR may dispose of flammable materials by burning on the project site, provided all requirements set forth by the authorities are met. In all cases, the authority to burn shall not relieve the CONTRACTOR in any way from damages which may result from his operations. Concrete Removal and Disposal - All concrete foundations, footers, oors, wa s, roo s, s a s, pads and other concrete items associated with structures and facilities to be removed under Section III,2 of the Special Conditions, and all other concrete structures associated with the Hawk's Nest Mine-East Mine Area, shall be removed down to a minimum vertical distance of 4 feet below the final regraded surface. Portions of concrete structures that will be situated deeper than 4 feet blow the final regraded surface can be left in place if desired. This specification also applies to all reinforcing rod, wire mesh, or other non-concrete materials found within or otherwise affixed to the concrete material, ALL concrete and reinforcing material shall be disposed of by burial within fill areas, backstowing within the mine entries, or by disposal within the excavated trench at the Hawk's Nest Mine refuse disposal area near Hotchkiss, -7-