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Attachment 2 UNITED STATES DEPARTMENT OF ACY.ICUL'fURE Soil Conservation Service Colorado SectionvlV ,._.._ All Field Offices July 1981 STANDARDS AND SPEf_IFICATIONS CRITICAL AREA PLANTING (ac.) (34Z) Standard ilafinitinn Planting vegetation, such as trees, shrubs, vines, grasses or fortis, on highly erodible or critically eroding areas (does not include tree planting mainly for wood products). Purpose Planning consideration C;ther conservation practices, including but not limited to diversions, land smoothing, obstruction. removal, surface and subsurface drains, and underground outlets, may be necessary to prepare a critical area for planting. Site pre- paration accomplished through the appli- cation of the above practices should result in a site meeting the following standards. To stabilize the soil, reduce damage from sediment and runoff to downstream areas, and improve wildlife habitat and visual resources. Conditions where practice applies On highly erodible or critically ero- dible or critically eroding areas. These areas usually cannot be stabil- ized by ordinary conservation treat- ment and management and, if left untreated, can cause severe erosion or sediment damage. Examples of applicable areas are dams, dikes, mine spoil, levees, roadsides, cuts, fills, surface-mined areas, and de- nuded or gullied areas where vegeta- tion is difficult to establish by usual planting methods. Critical area planting should be applied only on sites that have the capability of supporting vegetation. Some critical areas are so hostile to plant gro~.rth, because of climate, soils or slope, that stabilization can be :ir_hieved only through struc- tural measures. 1. Land slopes should not exceed 50 percent (2:1) and should be flatter where feasible and practicable. 2. Soils or soil materials must have sufficient depth and potential fertility to support the type of vegetation to be established. 3. Aaterials such as rocks and trash that will interfere with planting must be removed. 4. Runoff water from the site or adja- cent areas must be controlled in a manner that will prevent serious erosion and damage to the planting. Specitications Topsoiling In the event that the soils have insuffi- cient depth or have physical character- istics unsuitable for development of vegetative cover, topsoil or soil material having the capability of supporting the planned vegetative planting shall be brought in and spread over the deficient areas. The material must be applied uniformly in sufficient depth to support the type and quality of vegetative cover planned for the site. Source of materials must be approved by the responsible technician. TG:1 `1 ~ 0