2011-03-25_PERMIT FILE - C1981019A (7)

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remaining topsoil may be in the 24 inch range that should then help to encourage sagebrush emergence while discouraging vigorous grass growth. Where topsoil is bemred, a peak depth up to 30 inches may result. In these thicker topsoil areas, other taxa within the seed mix (or alternate mix) should provide additional competitive advantage. It is critical that berms be constructed on the contour to preclude development of preferential erosion pathways. It is also necessary that beans only be constructed where they will be approximately perpendicular to the prevailing winds, otherwise there is little benefit to be gained. Furthermore, berms would have to exhibit low and rounded shoulders to allow seeding equipment to operate properly. Implementation of techniques such as this must necessarily occur as a result of site - specific opportunity (as opposed to plan) given a variety of factors, not the least of which is availability of equipment and personnel. As indicated in Figure 2.05 -6 below, the dimensions (in cross - section) would need to be based on the width of seeding equipment to facilitate proper seeding operations, although the widths indicated may be changed in the field, especially given aspect differences. In this regard, sagebrush conducive seed mixes would be applied to the shallow soil areas as well as the uphill - facing side of the berm (west - facing slopes). This is the area that will receive maximum benefit from entrapped snow. The downhill - facing side of the berm would ideally receive the grassland conducive mix owing to the steeper slope (4:1). For easterly aspects, the grassland conducive mix would still need to be applied to the downhill 4:1 slope. As this technique is developed and "proven ", modifications to seed mix placement can and should be made as necessary. Figure 2.05 -6 SOIL FENCE CONSTRUCTION DIAGRAM (EXAMPLE) 2 8 bedar wlMh seeder seeder Widths (too elope) width :11 slop (4:1 slop Overburden This additional level of complexity should not be problematic for maintaining an overall topsoil balance. It will simply add an additional layer of "bookkeeping" (Section 12 of the Annual Report) beyond that which has already occurred at Colowyo over the past three decades. Revegetation Plan Following the retopsoiling of an area, any necessary fertilization, surface preparation, berm development, construction of contour furrows, and seeding of the reclamation will take place. The reclamation seed mixture for areas targeting grassland (grazingland land use and erosion 2.05 -32 Revision Date: 9/28/09 Revision No.: TR -82