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' ~: ~ i • I EXH 181 T "AA" • - ~ UNITED STATES DEPARTMENT OF AGRICULTURE Technical G ids Soil'Conservation Service) Section IV '~ Colorado ~ All Field Of~fides ~~ ~ July 1981 i i Standard ~ -^~- Deflai-t-iou;~ , f -~ Planting vegetation, such 'as trees, shrul?s, vines, grasses or~forbs, on highly erodible or critfically eroding areas (does not i[{clude tree planting mainly for wood products). Purpose Plannine considerations Other conservation prac ices, including ..but not limited to divevsions, land smoothing, obstruction iemoval, surface and subsurface drains, ~nd underground outlets, may be necessa~y to prepare a critical area for plant ng. Site pre- paration accomplished t rough the appli- cation of the above pra tic es should result in a site meetin the following standards. To stabilize the soil, reduce damage from sediment and runoff to downstream 1 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 growth, because of climate, soils or slope, that stabilization can be achieved only through struc- tural measures. TGN 11170 STANDARDS (tND SPECIFICATIONS CRITICAL AREA PLANTING (ac.) i (342) 2 Land slopes should ~ot exceed 50 percent (2:1) and should be flatt~}ry(¢:~ where feasible and practicable. Soils or soil mater~als must have sufficient depth ant potential fertility to suppora the type of vegetation to be es¢ablished. 3. Materials such as rocks and trash that will interfere with planting must be removed. 4. Runoff water from tl~e site or adja- cent areas must be $ontrolled in a manner that will pr vent serious erosion and damage to the planting. Specifications Topsoiling In the event that the soils have insuffi- cient depth or have phy ical character- istics unsuitable for development of vegetative cover, topso l or soil material having the capability of supporting the planned vegetative planting shall be brought in and spread o~er the deficient areas. The material mu t 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.