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• 1.4 1.2 Roadway Regrading <br />For purposes of estimating reclamation cost, three types of roads have been identified at <br />Trapper Mine, and they are access, haulage, and dragline walk roads. These roadways <br />are designed and constructed to minimize amounts of cuts and fills, which minimizes the <br />amount of backfilling and grading that would be necessary to return them to a <br />satisfactory contour. Caterpillar D10R dozers were selected as the most cost efficient <br />equipment, given the average distances calculated. These push distance and volume <br />calculations for the roadways are based upon typical cross sectional areas. These <br />areas were applied to projected road lengths during the worst case year of 2012 as <br />shown on Map Mg. From these values, times, as shown in Table 1.4-5, were calculated. <br />Costs were also included for ripping haulydads using a material seismic velocity of 5000 <br />fps. <br />Trapper is careful not to introduce materials on roads that will require removal at a later <br />date. That is specifically why the use of ash on haul roads has not been pursued. <br />Roads are constructed of earthen fill and sub -base material with gravel on top. Scoria <br />may also be)k used if available. These inert materials are easily graded during <br />reclamation, covered with topsoil, and do not adversely affect the growth of vegetation. <br />Post mining land use requirements are not compromised. <br />Drainages affected by road fills include East Buzzard, Far East Buzzard, Coyote, No- <br />Name, Johnson, West Pyeatt, Middle Pyeatt, East Pyeatt, Grouse, Sage, Oak, and <br />Flume. <br />• <br />1-40 <br />Revisinn: <br />Approve <br />