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n u •'ERHIBIT - J - 5 UNITID STATES DEPARTTfF17T OF AGRICIILTORE Soil Conservation Service Colorado Sechnical Guide Section N All Field Offices July 1981 STANDARDS AND SPECIFIGTIONS CRITICAL AREA PLANTING (ac.) (342) Standard De.Finition Pl+inting vegetation, •uch as trees, •h:rubs, vines, grsesee or (orbs, oa highly erodible or critically eroding areas (does not include tree planting mainly for rood products). Putrpose To stabilize the soil, reduce damage from sediment sad runoff to dovnetream areas, and improve wildlife habitat and visual resources. Conditions where practice applies On highly erodible oz critically ero- Bible or critically eroding areas. 1'h~ese 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 ^reas are dams, dikes, mine spoil, levees, roadsides, cuts, fills, surface-mined areas, and de- nuded or gv111ed areas where vegeta- tion is difficult to establish by usual planting methods. Cr:ltieal area planting should be applied only oa sites that have the capability of supporting vegetation. Soeee critical areas are so hostile to plant growth, because of climate, •o:Lls or elope, that •tabilizacion eni be ^chieved only through struc- tural measures. Planning considerations Other conservation practices, including but not limited to diversions, land smoothing, obstruction removal. surface and subsurface drains, and underground outlets, may be accessary 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. 1. Lad •lopea should not exceed 50 percent (2:1) and should be flatter where feasible and practicable. 2. Soils or soil materials moat have sufficient depth and potential fertility to support the type of vegetation to be established. 3. !la[erialc ouch as rocks and trash thac will interfere with planting Host be removed. 4. Runoff eater from the site or ad~a- cent areas must be controlled in a manner that will prevent serious erosion and damage to the planting. Specifications TopsoilinS In the event that the soils have insuffi- cient depth or have physical character- istics unsuitable for development of vegetative cover, topsoil oz ^oil material having the capability of supporting the planned vegetative planting shall be brought Sn and spread over the deficient cress. The material must be ayplled uniformly in sufficient depth co support the type end quality of vegetative cover planned for the site. Source of materiels must be approved by the responsible technician.