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

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size cutoff will be at the discretion of the reclamation coordinator, however, a practical limitation must be defined given the complications realized by the change in revegetation targeting measures. Where Sagebrush Steppe revegetation will be targeted, Colowyo would apply shallow lifts of topsoil (< 6 inches, ideally 4 inches). Where ideal spoil conditions are encountered, special effort will be made to place very minimal topsoil layers (nearly zero). The size of these areas must be small in order to ensure the potential erosion potential created by this activity does not negatively impact areas down slope. It is imperative for the Division to grant a substantial amount of latitude to Colowyo in the first several years of the implementation of the new reclamation plan as this will be a learning process for all parties involved. The Division will be informed of any instances of "nearly zero" topsoil laydown areas prior to or during topsoil laydown activities to ensure that the Division has the opportunity to verify Colowyo is adequately managing erosive potential. In most cases, due to the general rockiness of Colowyo's spoil, a layer of topsoil is desirable in order to limit damage to the preferred seeding equipment that will be utilized wherever possible in these areas, as proper seed depth placement is a major factor when establishing shrubs. To help maintain topsoil replacement balances, thicker lifts of topsoil (> 6 inches, occasionally up to 3 -4 feet) can be placed along the groin of opposing slopes (drainage - ways). On long slopes steeper than 10 %, topsoil distribution using pushdown techniques may be altered to facilitate thin layers near the upper shoulders of the slope, with thicker layers near the bottoms. In this manner, the lower elevation areas that tend to catch more snow will receive and store greater quantities of moisture with the hope that some of the mountain shrub seed within the seed mix will be presented with enhanced opportunities for growth and development, especially taxa such as snowberry. The shoulders of the slope, where soil thickness has been reduced will present greater opportunity for sagebrush to develop given reduced competition from cool- season grasses. In order to facilitate proper accounting of the topsoil resource, topsoil placement on specific areas will be tracked by load counts of the equipment involved. In cases where only Sagebrush Steppe acres are reclaimed in one season, replacement volumes may be less than the currently approved 8 -inch average (in the original permit area, approximately 20 inches in the South Taylor area). This does not cause undue harm on the resource as the "left over" material will be utilized in the development of deeper soil areas elsewhere in the reclamation progression. All activities will be accurately and fully described within the confines of the Annual Reclamation Reports that include topsoil balance tracking. Another directive with regard to topsoil distribution (at the discretion of the field supervisor) will be instruction to equipment operators to NOT engineer the final surface, but to the contrary leave it in a very roughened state, where there is the opportunity to diversify the potential plant communities within individual reclamation blocks and further reduce erosion potential. The primary directives in this regard will be to not leave preferential pathways for erosion and to avoid development of surface features that will overly compromise proper seed placement by seeding equipment (e.g., steep and narrow ridges). Sagebrush steppe areas will by necessity be predominately smooth prior to seeding in order to accommodate the special needs of the preferred seeding equipment to be utilized on those sites. Another topsoil distribution technique that may be used in areas targeting Sagebrush Steppe would be the development of low berms using emplaced topsoil with the aid of equipment such as a road grader (see Figure 2.05 -6 below). For ease of discussion, such berms could be termed "soil fences ". These berms would act as natural snowfences trapping wind blown snow to aid sagebrush emergence and development. In this circumstance, a designed amount of topsoil (e.g. 9 inches) would be redistributed over a target area, however, berms would be developed utilizing only the topsoil resource. Where upper layers of topsoil have been pushed aside, a depth of 2.05 -31 Revision Date: 9/28/09 Revision No.: TR -82