2002-06-18_PERMIT FILE - M2002062

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UNITED STATES DEPARTMENT OF AGRICULTURE Soil Conservation Service Colorado Technlcal Guide Section IV All Field Offices July 1981 STANDARDS AND SPECIFICATIONS CRITICAL AREA PLANTING (ac.) (342) Standard Definition Planting vegetation, such as trees, shrubs, vines, grasses or fozbs, on highly erodible or critically eroding areas (does not include tree plaatlag mainly for wood products). Purpose To stabilize the soil, reduce damage from sediment and runoff to dovnstream areas, and improve wildlife habliat sad visual resources. Conditions where practice applies Oa highly erodible or critically ero- dible or critically eroding areas. These areas usually cannot be stabil- ized Dy ordinary conservation treat- ment and management and, if left untreated, can cause severe erosion of sediment damage. Ezamples of applicable areas are dams, dikes, mine spoil, levees, roadsides, cute, fills, surface-mined areas, and de- nuded or Bullied areas vhere 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 elope, that stabilization can be achieved only through struc- tural measures. Planning considerations Other conservation practices, including but not limited to diversions, land smoothing, obstruction removal, surface sad subsurface drains, and underground outlets,- may be necessary to prepare a critical area for planting. Site pre- paration accompllshed through the appli- cation of the above practices should result in a site meeting the following standards. 1. Land elopes should not exceed 50 percent (2:1) and should be flatter where feasible and practicable. 2. Soils or Boil materials must have sufficient depth and potential fertility to support the type of vegetation to be established. 3. Materials such as rocks and trash that will interfere with planting moat be removed. 4. Runoff eater from the site or adja- cent areas must be controlled in a manner chat will prevent serious erosion and damage to the planting. Specifications TopaollinR Ia the event that the soils have insuffi- cient depth or have physical character- iatiea unsuitable for development of vegetative ewer, topsoil oz soil material having the capability of supporting the planned vegetative planting shall be brought in and spread over the deficient areas. The matezlal must be applied uniformly in sufficient depth to support the type and quality of vegetative corer planned for the site. Source of maierials must be approved by the responsible technician.