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4.15.2 Use oflntroduced Species <br />The examination of the seed mixture approved for the reclamation of rangeland indicates that <br />Colowyo desires to include some introduced species in the mixture for which regulatory <br />approval was obtained. Introduced species included in the seed mixture are: <br />(1) Intermediate Wheatgrass (Aaouvxon intermedium) <br />{2) Siberian Wheatgrass (Aeropyron sibericum) <br />(3) Pubescent Wheatgrass(Agropyrontrichophorum) <br />(4) Smooth Brome (Bromus inermus} <br />(5) Orchard Grass (Dactylus glomerata) <br />(6) Vinall Russian Wildrye (Elymusjunceus) <br />(7) Durar Hard Fescue (Festuca ovina duriscula) <br />(8) Timothy (P eu pratense) <br />(9) Kentucky Bluegrass(Poa pratensis) <br />(10) Lutana Cicer Milkvetch (Astragalus cicer) <br />(11) Blue Flax lino lewisii) <br />(12) Alfalfa (Medicacxo saliva} <br />Of the 31 species approved, 19 species are native.. On a seed weight basis, 65% of the seeds <br />to be planted are native species seed. <br />The introduced species are included in the mixture because they- are necessary to control <br />erosion and because they will provide forage for wildlife and livestock on the reclaimed area. <br />The research at Colowyo by the Colorado State University (CSU), Agronomy Department <br />has documented the superiority of the introduced species for revegetation purposes compared <br />with other species under similar conditions. The CSU study and two progress reports are set <br />foRh in Exhibit 10, Vegetation Information. None of the introduced species are poisonous or <br />noxious. For further discussion of the value of introduced species for obtaining the desired <br />post-mining vegetative community of the same seasonal variety and lifeform of the pre- <br />mined area, refer to Section 2.05. <br /> <br />4.15-2 Revision Date: 5/10/99 <br />Revision No.: TR-47 <br />