2019-04-16_REVISION - C1981019 (3)

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RULE 4 PERFORMANCE STANDARDS Rule 4 Performance Standards 4-47 Revision Date: 4/16/19 Revision No.: MR-200 During repair of any rill or gully Colowyo will first identify and salvage any topsoil that may have been repositioned by erosion. This topsoil will be salvaged, stockpile in a location that is easily accessible by equipment making repairs, and re-applied after the repair of a rill or gully is complete. Once repairs are complete, topsoil will be re-applied to the disturbed area and re-seeded to the appropriate seed mixture. Colowyo is committed to preserving the topsoil resources and utilizing it appropriately through approved reclamation practices. Remediated areas will be monitored for one year following repair, and should the area appear to be stabilized monitoring will be discontinued for that area. Areas that continue to exhibit unstable conditions will be remediated again and monitored for another year. 4.15 Revegetation Requirements 4.15.1 General Requirements Colowyo will establish on all affected land within the mine plan area a diverse, effective and permanent vegetative cover of the same seasonal variety as that native to the area. On lands revegetated prior to 2008 the vegetative cover will be comprised of native and introduced species that are desirable and necessary to achieve the approved postmining land use as required under Section 4.15.2. The original seed mixture to be planted is shown in Section 2.05 on Table 7, Reclamation Seed Mixture. On lands revegetated in 2008 and thereafter, the vegetative cover will be comprised of native species that are desirable and necessary to achieve the approved postmining land uses as required under Section 4.15.2 (with modest exceptions). However, additional seed mixtures, revegetation metrics, and bond release protocols designed to target specific post-mining land use components are presented within the context of this section (4.15) as well as the reclamation plan, Section 2.05. Remaining discussions under this section (4.15) will refer to “pre-2008” versus “post-2008” revegetation plans, efforts, specifications, and bond release protocols. Pre-2008 refers to revegetation activities performed prior to April, 2008). Post-2008 refers to revegetation activities occurring during or after April, 2008. The details of the revegetation plan are discussed in Section 2.05.4. 4.15.1(4) Vegetation Monitoring The monitoring plan to evaluate the success of shrub conducive efforts including direct seeding of sagebrush, natural reinvasion by sagebrush, as well as herbaceous vegetation success is as follows: 1. To facilitate identification, sampling of herbaceous vegetation will take place during the peak of the growing season when the vegetation reaches the mature stages. This period of time is generally from late June to late August. 2. Unlike sampling for bond release purposes, sampling will not be required to meet statistical adequacy.