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The concrete and block wall materials, and all other rubble and debris shall be placed against <br /> the various highwalls and cuts, and shall be evenly spread at the base of these features along <br /> their lengths. All of the debris and rubble shall be covered by a minimum of four (4) feet of <br /> backfill material during Task 4 (Earth Work), portion of the project. <br /> Mine 1 Fan <br /> Rubble from the demolition of the fan foundations may be placed within either of the two <br /> entries at this location. Materials placed within the Mine 1 fan entry shall be placed so that <br /> damage to the existing cinder block wall located approximately thirty (30) feet inside the entry <br /> does not occur. The half-round corrugated metal shrouding at this location must be <br /> completely filled from floor to ceiling and from the block wall to the entry. Void spaces shall <br /> be minimized. If rubble is not sufficient to backfill the entries, the backfilling will be <br /> completed under Task 4, Earth Work. <br /> Mine 1 Yard <br /> Debris scattered at this location will be collected from the surface of the yard area and from <br /> the surface of the outslope. This material will be placed against the north westerly portion <br /> of the highwall, and will be covered by backfill during Task 4, Earthwork. <br /> Mine 1 <br /> Many of the structures at this site have been previously demolished. Retaining walls and <br /> foundations still require demolition. Much of the rubble may be placed within the southern <br /> mine opening. This entry consists of half-round corrugated metal estimated to be nine (9) feet <br /> tall, twelve 0 2) feet wide and forty (40) feet deep. A single width concrete block wall seals <br /> the entry at forty (40) feet within the entry. Materials placed within this entry shall be placed <br /> so that damage to the existing cinder block wall does not occur. The half-round corrugated <br /> metal shrouding at this location must be completely filled from floor to ceiling and from the <br /> block wall to the entry. Void spaces shall be minimized. If the volume rubble is not sufficient <br /> to backfill the entry, backfilling will be completed under Task 4, Earth Work. <br /> Numerous foundations, walls, debris and rubble exists north of the open entry. These <br /> materials will be placed against the cut slopes in those areas which are free of avalanche <br /> hazards. The disposal areas will be designated by the PROJECT MANAGER, and will conform <br /> to the areas designated for backfilling in Task 4, Earth Work. Generally, the disposal areas <br /> are adjacent to the current location of the foundations and walls. In those instances where <br /> foundations, rubble or building remnants would be covered by a minimum of four (4) feet of <br /> material as a result of backfilling and grading operations contemplated in this Invitation for Bid, <br /> removal of the structure is not required. <br /> Mine 2 <br /> Concrete foundations exist parallel to the previously-existing conveyor which emerged from <br /> this entry. The entire length of the foundations will be removed to a depth of three (3) feet <br /> below ground level. A large foundation exists along the belt line about seventy five (75) feet <br /> downslope from the mine entry. This structure may be collapsed upon itself and buried in <br /> 8 <br />