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• graded towazds the.open pit at SH:1V slopes. All highwall slopes would be reduced to 3H:1V. This <br />produces a final stable topography that could not only be revegetated, but would also allow drainage <br />to flow through the pit area without impounding water. However, in reality, this is not achievable; <br />instead most slopes are constructed between SH:IV and 3H:IV. It was also assumed that in most <br />cases there would be four standing spoils behind the open pit This is a very conservative estimate <br />because, in most cases, reclamation grading is current to within two spoil piles. However, in the <br />Neck Pit azea there was only one spoil ridge constructed. <br />The cut and fill volumes aze balanced to determine material needed to create the above-described <br />topography. A swell factor of 17 percent was utilized for the bonding estimate. The adjacent spoil <br />would be dozed into the open pit and the three other spoils would be graded into the adjacent v's <br />cleated by the spoil (see appropriate worksheets in Attachment 25-1). <br />Highwalls will be reduced and sloped towazds the open pit This would be accomplished by drilling <br />and shooting the highwall and then dozing the blasted material into the open pit. See appropriate <br />worksheets hr Attachment 25-1 for a complete listing of volumes to be dozed into the open pit <br />• Various computer programs are used to determine equipment production. See appropriate <br />worksheets in Attachment 25-1 for production and costs. <br />The 20Q4 topography (determined from aerial photography) and postmitilng topography maps were <br />compazed fox material movement. Although a speafic postmine topography map is not available for <br />a 2004 none closure, drainage patterns will generally remain the same as the planned final <br />topography. <br />RigpinQ Work <br />This task includes dozer work in final pit and haul mad areas that need to be ripped to alleviate <br />compaction following regarding. <br />Road Reclamation <br />This task consists of dozer and motorgxader work to narrow and blend temporary and permanent <br />• roads into the surrounding topography and to place the excess material in appropriate locations. <br />Origiually, it was assumed that surface material/gravel ripped to narrow roads and parking areas <br />would be hauled to a final pit for disposal. However, the sequencing and timing of the various <br />PR-02 3 Revised 01/06 <br />