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RULE 4 PERFORMANCE STANDARDS <br /> Remediated areas will be monitored for one year following repair, and should the area appear to <br /> be stabilized monitoring will be discontinued for that area. Areas that continue to exhibit unstable <br /> conditions will be remediated again and monitored for another year. <br /> 4.15 REVEGETATION REQUIREMENTS <br /> 4.15.1 General Requirements <br /> Colowyo will establish on all affected land within the mine plan area a diverse, effective and <br /> permanent vegetative cover of the same seasonal variety as that native to the area. On lands <br /> revegetated prior to 2008 the vegetative cover will be comprised of native and introduced species <br /> that are desirable and necessary to achieve the approved postmining land use as required under <br /> Section 4.15.2. The original seed mixture to be planted is shown in Section 2.05 on Table 7, <br /> Reclamation Seed Mixture. On lands revegetated in 2008 and thereafter,the vegetative cover will <br /> be comprised of native species that are desirable and necessary to achieve the approved postmining <br /> land uses as required under Section 4.15.2 (with modest exceptions). However, additional seed <br /> mixtures,revegetation metrics, and bond release protocols designed to target specific post-mining <br /> land use components are presented within the context of this section (4.15) as well as the <br /> reclamation plan, Section 2.05. <br /> Remaining discussions under this section (4.15) will refer to "pre-2008" versus "post-2008" <br /> revegetation plans, efforts, specifications, and bond release protocols. Pre-2008 refers to <br /> revegetation activities performed prior to April, 2008). Post-2008 refers to revegetation activities <br /> occurring during or after April, 2008. <br /> The details of the revegetation plan are discussed in Section 2.05.4. <br /> 4.15.1(4) Vegetation Monitoring <br /> The monitoring plan to evaluate the success of shrub conducive efforts including direct seeding of <br /> sagebrush,natural reinvasion by sagebrush,as well as herbaceous vegetation success is as follows: <br /> 1. To facilitate identification, sampling of herbaceous vegetation will take place during the <br /> peak of the growing season when the vegetation reaches the mature stages. This period of <br /> time is generally from late June to late August. <br /> 2. Unlike sampling for bond release purposes,sampling will not be required to meet statistical <br /> adequacy. <br /> 3. During the first growing season of a reseeded area, a visual determination of seeded and <br /> volunteer species will be performed. From-this information, any apparent revegetation <br /> issues will be determined for the seeded species, and unsatisfactory stands of any <br /> component can be identified for corrective action. In addition to this visual evaluation, a <br /> semi-quantitative procedure will be implemented to evaluate seedling emergence. This <br /> procedure involves unbiased placement of several small quadrat frames at multiple <br /> locations across the reclaimed unit and counting the number of emergent plants by life form <br /> Rule 4 Performance Standards 4-38 Revision Date: 12/20/19 <br /> Revision No.: TR-135 <br />