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Revegetation Assessment <br /> Guanella Reservoir <br /> Clear Creek County,Colorado <br /> surface on at least the eastern (upslope)side. A combination of subsoil and topsoil, 2 feet thick,would <br /> be placed on top of the barrier to provide sufficient depth for the native species roots to grow(see Table <br /> 3 for the minimum root depth of recommended species). The subsoil would be approximately 1.5 feet <br /> thick and would have the appropriate texture and meet DRMS requirements. The topsoil would be a <br /> minimum of 6 inches and provide sufficient nutrients to support native grasses. Both the topsoil and <br /> subsoil would be tested by the CSU Soil Testing Lab and the results sent to DRMS before application at <br /> the project area. <br /> If testing shows that additional nutrients are needed for the subsoil,then a slow-release nitrogen <br /> fertilizer(such as Biosol) would be applied to the soil. A fast release nitrogen fertilizer would not be <br /> used because it only promotes weeds such as kochia,which already occurs in the project area. <br /> Seeding Recommendations <br /> Because the Reclamation Permit Seed Mix has compatibility issues with the existing conditions at the <br /> project area, ERO recommends revising the mix to the native species shown in Table 3. The species in <br /> this revised seed mix are typically found in the area and some were observed during the 2018 site visit. <br /> Table 3. Recommended seed mix and tolerances. <br /> ft"Lim Introduced <br /> co nma,nee scientific Name Seed m pH RaW �� �ansak Root�wn- <br /> (PLs)!� Native(a} Tolerance (am) <br /> Fringed brome Bromus ahotus 1.8 N 6 0-8 0 Low 10 <br /> Mountain brome Bromus morginatus 5 N 4.5-8.0 High 20 <br /> Sand dropseed Sporobolus cryptandrus 0.1 N 6 6-8 0 Medium 18 <br /> Slender wheatgrass Elymus trochycoulus 3 N 5.6-9 Medium 16 <br /> Thickspike wheatgrass Elymus lanceolatus 4 N 6 6-8 4 Medium 16 <br /> lanceolatus <br /> Western wheatgrass Pascopyrum smithd 55 N 4 0-9.0 High 20 <br /> 19.4 <br /> Source:USDA,NRCS Plant Database 2018. <br /> The seeding should take place in the fall before the ground freezes over. Immediately after seeding,the <br /> site should be mulched and a tackifier added. <br /> Response to DRMS Comments <br /> The following are ERO responses to the revegetation-related DRMS comments. <br /> 5 <br /> R0 Resources Coroorat:or <br />