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the highhway will be graded and contoured ~c an approximation of the origi- <br />nal slope of 40 percent (Exhibit 2.05.4-F). Water bars will be incor- <br />porated into the recontoured area after distribution of topsoil. <br />Below the highway, grading and filling will be sufficient to provide a <br />reclaimable contour with a grade of approximately 30 percent in the wash <br />plant and laydown areas since original contours have been altered only <br />slightly. After the .three sediments ponds and drainage channel have been <br />filled, the .entire area will be graded and ripped in preparation for top- <br />SU11 T'°_{?17C~'?!c:~li.. ~ilr ta•1 t"~'!'~: .' <~ ue~ gr 7~,°. °.^ OC?",l:"m tU 'i hB <br />coni:our o. the hillside ,lust ab.;ve and riprap will be placed alo~ig the <br />~ i~~erban~ -to• ,r~event ,.washout. <br />A chaane', for tihe watercourse crossing the East Portal Disturbance <br />• Area wil'~ be prm idea. The channel wil': consist of a rrckiined ditch. <br />West Portal Disturba!:c2 Area <br />The area t:bove the highway within the disturbance area will be graded <br />and contoured to an aporoximatiuri of the original ;lope (40 to 50 percent) <br />ar.d physioyraphy (Exhibit 2.05.4-G1. small areas of slopes exceeding 50 <br />perceni ~r•e present. Grading will consist of reducing these slopes as much <br />as possibi~e +.ind es±ablishirig a safety factor of 1.5 where slopes exceed <br />1V:?H. Thy static safety factor of 1:5 will be demor~strated to CMLRB prior <br />to aban~~rm.~rrt. Grading by dozer will follow removal of structures, <br />sealing ;.; portals (4.07.3}, backfilling of cuts for the portals and access <br />read, and eo*~;paction .o.f filled areas. Water bars wi71 b2 incorporated into <br />the reco~itoured area after distribiitidn of topsoil. <br />• <br />°.u"5-54 <br />