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<'' +,~~ United States Soil ~ Department of \ ~~~ Conservation .y, AgricWture Service N. Colorado ison, CO 81230 e.) Any banlr~--or other slopes of moderate or greater degrees should be worked yrii},tinlreason to provide as minimal a slope as possible, preferably~2:1 of less. If steeper slopes must be vegetated, erosion control measures such as small terraces or benches, contour ditches or furrows, or other structures may be necessary to prevent surface erosion and sloughing_during plant establishment. If benches are necessary for soil and slope s.tabi-pity, bench height above the next lower bench should not exceed 20 ft. f.) If possible-a1-1--roads-and-other similarly disturbed areas should be graded or reworked so as to blend into or approximate the surround- ing landscape as closely as possible. Any man-made ditches or other drainages should be filled or structured such that water erosion will be prevented or minimal, and surface water run-off is properly chan- neled at non-erosive slopes and with non-erosive outlets. 4) Seeding mixture recommendations are provided for two phases of the overall project: a) seeding done during project operation (top soil reserve, progressive backfill areas, etc.); b) seeding done after project completion as final reclamation. This differentiation takes into account the probable increased use of the area by live- stock and/or wildlife after project completion. Both recommended seed mixtures, for their intended purpose, are felt to best repre- sent an optimum combination of factors including ease of establish- ment, soil holding and stability characteristics, forage value, low maintenance during and after establishment, commercial availability in the local or regional area, and tolerance of low-moisture condi- tions. Please refer to form CO-ECS-5 (attached) for recommended species and seeding rates by project phase. Use of all or even a majority of native species is not feasible or practical for the above stated reasons. 5) If supplemental water is available at the time of seeding, spring planting (May-June) should be satisfactory. The seedbed should be kept moist but not excessively watered until germination and seedling establishment is proceeding well. Water should be provided sufficient only to keep the plants from undergoing water stress or wilting, so that root systems will develop deeper and rely more heavily on natural soil moisture. If no water is available to provide such limited ir- rigation at time of seed germination, seeding should preferably be done in late fall (Oct.-Nov.) after freezing soil temperatures but prior to permanent winter snowfall. Seeds will be dormant over winter and germinate the following spring, using snowmelt moisture. 6) As noted on form CO-ECS-5, if seed is drilled rather than broadcast, the amounts shown in column (5) should be halved. If broadcast, O The Soil Conservation Service -3- lJ ~9 an agency of the D eOarrmenl of Agric ull ure