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°"=_~, Un~teAStates soi• •6 N. Colorado Department of Conservation 'e ~~ ~ AgricWture Service Gunnison, CO 81230 ~~% preferably 2:1 or 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 stability, bench height above the next lower bench should not exceed 20 ft. f.) If possible, all 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 ditcfies 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 recommendation is applicable for two phases of the overall project: a) seeding done during project operation (top soil reserve, progressive backfull areas, etc.); b) seeding done after project completion as final reclamation. The recommended seed mixture is felt to best represent an optimum combination of factors including ease of establishment, soil holding and stability character- istics, forage value, low maintenance during and after establishment, commercial availability in the local or regional area, and tolerance of low-moisture conditions. Please refer to form CO-ECS-5 (attached) for recommended species and seeding rates. 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, covering of seed by dragging an English (or similar) harrow over the area would provide more optimum conditions for proper seed germination. Under no conditions should seed be deeper than one- half (~) inch below the soil surface. 7) Upon completion of seedbed preparation and seeding, tfie seeded area should be covered with straw of similar mulch material at O Tne Soil Conservai~on Service U ~s en aBencY of the Department of ABr¢ulture