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• Therefore, additional spoil regrade calculations are unnecessary as this would be the worst case <br />condition of spoil reclamation with respect to affected regrade widths. <br />Dozers woukt do the backfilling and grading as this is the most cost efficient equipment other than <br />draglines given the average distances calculated. Caterpillar D11N dozers were selected as the most <br />efficient equipment to complete the regrading task. A lerier from Wagner Equipment addressing the <br />availability of D11's is included in Appendix A. In the area where D and E pits come together, scrapers <br />will replace much of the material due to longer distance material movement. Similarly, regrade in G pit <br />requires a significant amount of scraper work to facilitate the regarding process. Scraper fleet size and <br />production rates were determined with TALPAC software. <br />Pits will be backfilled using spoil material currently available within existing spoil rows associated with <br />each plt. Appendix A provides appropriate cross sections of existing and regraded post-mine topogra- <br />phy. <br />1.4.1.2 Roadway Rearading <br />For purposes of estimating reclamation cost, three types of roads have been identified at Trapper Mine <br />and they are access, haulage, and dragline walk roads. These roadways are designed and constructed <br />• to minimize amounts of cuss and fills which therefore minimizes the amount of backfilling and grading <br />that would be necessary to return them to a satisfactory contour. Caterpillar D10R dozers were selected <br />as the cost efficient equipment given the average distances calculated. These push distance <br />calculations and volume calculations for the roadways are based on the typical cross sectional areas. <br />These areas were applied to projected road lengths during the worst case year of 2004 as shown on Map <br />M9. From these values, times as shown in Table 1.4-5 were calculated. Costs were also included for <br />ripping haulroads using a material seismic velocity of 5000 fps. <br />Trapper is careful not to introduce materials on roads that will require removal at a later date. That is <br />specifically why we have not pursued the use of ash on haul roads. Roads are constructed of earthen fill <br />and sub-base material wfth gravel on top, Scoria may also be used if available. These inert materials <br />are easily graded during reclamation, covered with topsoil and do not adversely affect the growth of <br />vegetation. Post mining land use requirements are not compromised. <br />Drainages affected by road fills include East Buzzard, Far East Buzzard, Coyote, No-Name, Johnson, <br />West Pyeatt, Midtlle Pyeatt, East Pyeatt, Grouse, Sage, Oak and Flume. <br />i-40 <br />