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Colowyo Mine Specific Field Trial <br />At the Colowyo Mine, field trial treatments to be evaluated include five plot treatments as <br />shown on Figure 4.15-1. <br />18 inches of live-haul topsoil over spoil with strip seeding. The strip seeding <br />would include a strip of native shrubs and native low-competitive forbs that <br />would alternate with a strip of native grasses, forbs, and shrubs. The proposed <br />seed mixtures for this treatment are presented in data provided in the 2005 Annual <br />Report. <br />2. 6 inches of live haul topsoil over spoil and seeding with native shrubs and low- <br />competitive native forbs. Include some surface manipulation to create <br />depressions for enhanced soil moisture conditions. The proposed seed mixture for <br />this treatment is presented in Table 1. <br />3. 6 inches of live-haul topsoil over spoil with strip seeding. <br />4. Non-topsoiled spoil with strip seeding. <br />5. Non-topsoiled spoil seeded with relatively unpalatable native shrubs, low- <br />competitive native forbs, and low-competitive native grasses. <br />It must be noted that at the time of planting, conditions were nearly perfect for the <br />emergence of sagebrush (from seed) regardless of field trials being attempted. This <br />circumstance was verified by excellent sagebrush recruitment from all surfaces reclaimed <br />during that year. Therefore, observed results must be interpreted accordingly. <br />4.15-8 Revision Date: 12/22/09 <br />Revision No.: TR-84