1992-07-01_REVISION - C1991078 (2)

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2 . 05 . 4( 2 ) (b) Spoil From Ridges The method used to move spoil ridges into the adjacent pits is to push it with a tractor dozer. The maximum push distance is 360 feet, four pits. The average push distance is 180 feet . From edition 15 of the Caterpillar performance handbook, it is estimated that a D-9 can push 500 cubic yards per hour with a 180' push distance. Assuming a D-9 costs $125 per hour, the cost per cubic yard to move the spoil ridges is $0. 25 . Spoil From Highwall Reduction Assume the necessary spoil can be ripped from adjacent pits . Rip with a D-9 dozer at a cost of $165 . 00 per hour. Use $0. 33 per CY to push the material into the adjacent pit . From edition 15 of the Caterpillar performance handbook, it is estimated that a D-9 can rip 250 cubic yards per hour. The cost per cubic yard for highwall reduction is therefore $0. 66 + $0. 33 = $0.99. Pond B Topsoil The method used to move the topsoil in the Pond B area is to push it back over the reclaimed sediment pond. The push distance is 300 feet. From edition 15 of the Caterpillar performance handbook , it is estimated that a D-9 can push 375 cubic yards per hour with a 300' push distance. Assuming a D-9 costs $150 per hour, the cost per cubic yard is $0. 40 . Reclaim Sediment Ponds The work required to reclaim the sediment ponds is to simply push the embankment back into the pond and regrade the area with a track type dozer. A total of five ponds and five collection ditches will be reclaimed. It is estimated that each pond and associated collection ditch can be reclaimed in eight hours with a track type dozer. The cost to reclaim each pond is estimated to be 8 Hrs . X $150 = $1200. Reclaim Haul Road Approximately 9180 feet of haul road and 5800 feet of access road will be reclaimed. The operation necessary to reclaim the road involves pushing material into the borrow ditch- es and leveling the road in preparation for topsoil placement. The typical haul road section shown on Drawing No. 118 indicates that the volume of material to move to reclaim the road is mini- mal. The majority of work required will be leveling the road for topsoil placement. It is estimated that a track type dozer can reclaim 1000' of road per day. Total cost to reclaim the haul road is 120 Hrs. X $150.00 = $18, 000 . The placement of topsoil on the haul road is provided for in the topsoil category above. • 2 .05-18 July 1991