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undisturbed stands will reinvade the reclaimed areas by means of plant propagules (seed or extension of <br />• rhizomes), establishing existing species such as willows, in addition to the species contained in Seed Mix <br />No. 2 (see Tab 22). <br />Anticipated disturbance relates only to those activities necessary for the construction of a portion of the haul <br />road embankment. Salvaged topsoil will be replaced following necessary grading to reclaim the road and <br />shape the final contours. As part of seedbed preparation, the replaced topsoil will be disked with the first <br />pass made partially into adjacent native vegetation to "tie" the reclaimed and native sites together, <br />Revegetation will follow the methods described in Tab 22, Revegetation. Seed Mix No. 2 will be seeded in <br />reGaimed areas within the stream buffer zone area that will be affected by the small amount of haul road <br />disturbance. This mix contains a number of species already present in this disturbed type, in addition to a <br />number of desirable species. Maintenance, monitoring, and management activities are detailed in remaining <br />sections of lab 22, Revegetation Plan. <br />The foregoing discussion has been provided to support SCC's request for approval to disturb a small <br />amount of land within the buffer zone to a perennial stream. The request is founded on SCC's commitment <br />to protect the hydrologic balance by minimizing and mitigating the disturbance using the above-referenced <br />engineering design and mining and reclamation plans. This request was approved as TR 02. <br />Desion and Construction. The design of the haul roads incorporates the demand for mobility and travel <br />efficiency, based on the geometric criteria appropriate for the anticipated volume of traffic, weight and speed <br />of the vehicles to be utilized. The tlesign and construction or reconstruction of haul roads not within the <br />estimated mining area will be certified by a registered professional engineer, except as provided in Rule <br />4.03.1(1)(d)(ii). <br />Should construction of haul roads outside the mining areas be necessary, they will be designed and <br />constructed or reconstructed in compliance with the following standards in order to control erosion and <br />minimize disturbance of the hydrologic balance. <br />• The vertical alignment of the haul roads will not exceed 10 percent on the overall grade. Maximum <br />pitch grade will not exceed 15 percent, and there will not be more than 300 feet of pitch grade <br />exceeding 10 percent within any consecutive 1,000 feet. <br />• The horizontal alignment will be consistent with the existing and postmining topography and will be <br />coordinated with the vertical alignment to ensure that the roads will not cause excessive <br />environmental damage. <br />• Road cut slopes will not be steeper than 1.5H:1V in unconsolidated material or 0.25H:1V in rock. <br />Embankment fill slopes will not be steeper than 2H:1V, except where embankment material is a <br />minimum 85 percent rock. Embankment slopes will not be steeper than 1.35H:1V unless it has <br />PR-05 17 Revised 01!06 <br />