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production rates for scraper production was used for the East Pit scraper haul. <br />7.0 SELECTION OF APPROPRIATE RECLAMATION EQUIPMENT <br />Determination of required reclamation functions, material movement requirements, and <br />material movement distances provided the basis for selection of the appropriate reclamation <br />equipment. For the overburden drilling required for cast blasting, a Driltek D60K overburden drill <br />was selected due to its drilling depth capabilities and productivity. Based on the limited push <br />distances required for recontouring; the fact that, except for cast blast material, the cut material <br />would be in a consolidated condition; and the volume of material to be moved; a powerful, high- <br />capacity dozing unit was indicated for recontouring. The Caterpillar D10N tracked dozer was <br />selected as the principal dozing unit due to its capabilities in moving consolidated materials and <br />its high production capacity. For topsoil replacement, a combination of loader/truck, utilizing <br />992D wheel loaders and 777C haul trucks, and 637E scrapers, in a push/pull configuration, were <br />selected. Additional earthmoving and reclamation support equipment including a Caterpillar 14G <br />motor grader and 5,000 gallon water truck were selected on the basis of both job size and <br />compatibility with the tasks necessary to complete the reclamation work. <br />8.0 CALCULATION OF EQUIPMENT PRODUCTIVITIES <br />Reclamation equipment productivi[ies were calculated for each reclamation function using <br />push distances or haul segment length and grade information previously developed and standazd <br />calculation methods. For tracked dozer production, productivity estimates were based on <br />averaged push distances and grades and correction factors and seismic velocities obtained from <br />the Caterpillar Performance Handbook. Production estimates for tracked dozers are summarized <br />in Appendix B, Productivity Documentation. <br />Estimates for overburden drill productivity aze based on historical Colowyo operating <br />production data, which reflects typical unit equipment availability and utilization. Production <br />estimates for drills are summarized in Appendix B, Productivity Documentation. Historical drill <br />production rates for Colowyo Coal Company are listed in Appendix E, Other Documentation. <br />For the 637E tractor scrapers and 777C off-road trucks, haul segment lengths and average grades <br />were translated into haul and return times using the Caterpillar VEHSIM, and FPC computer <br />haulage simulation software. The following rolling resistance factors were used in the calculation <br />of cycle times: <br />7 Revision Date: 5/8/03 <br />Revision No. TR-56 <br />