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RULE 2 PERMITS <br />The Rock outcrop part is predominantly sandstone in long narrow bands with colluvial stones, cobbles <br />and boulders at the base. <br />Most of this complex is in native range and has limited use for grazing. Present and potential productivity <br />is poor. <br />104 - Borolls-Rock Outcrop Complex <br />This moderately steep to very steep complex is on north and west valley sideslopes and ridges. The soil <br />occurs throughout the permit area. In the areas where rock outcrop do not occur, the solids have a good <br />potential for reclamation. The average annual precipitation ranges from 15 to 18 inches, the average <br />annual soil temperature is 42°F to 47°F, and the frost-free season is 75 to 95 days. The Borolls make up <br />about 50 percent of this complex and occupy lesser slopes. The Sandstone Rock outcrop part makes up <br />about 30 percent of this complex and occupies steeper slopes and ridgetops. Included with this complex in <br />mapping are a few small areas of shale outcrops and shallow shale soils which make up the other 20 <br />percent. <br />The Borolls are shallow to deep, medium to fine textured, well drained soils over interbedded sandstone <br />and shale at a depth of 10 to 60 inches. They may be cobble or stone filled. <br />Typically the surface layer is dark grayish brown sandy loam or loam from 8 to 20 inches thick. The <br />subsoil, where present, is grayish brown sandy clay loam, or clay from 10 to 20 inches thick. The <br />substratum is light brownish gray sandy loam or sandy clay loam. Soft interbedded sandstone and shale <br />are at depths ranging from 10 to more than 60 inches. <br />The Boroll portion has moderate to rapid permeability and the available water capacity ranges from low <br />to high. The effective rooting depth is from 10 to 60 inches or more. Surface runoff is medium, and <br />erosion hazard is slight to moderate from wind and high from water. Most of the Boroll portion is native <br />range and used for grazing. Present and potential productivity is poor. <br />105 - Kemmerer-Moyerson Silty Clay Loams, 20 to 40 Percent Slopes <br />These moderately steep and steep soils are on foothill ridge crests and sideslopes near the center of the <br />permit area. A very small area (less than 1 acre) of this series was disturbed by the access road. No <br />additional activities are planned in areas covered by this soil, therefore detailed chemical and physical <br />data has not been collected for this series. The average annual precipitation is about 13 to 16 inches, the <br />average annual air temperature is about 45°F. Kemmer soil makes up about 45 percent of the mapping <br />unit and Moyerson soil about 40 percent. Small areas of a soil similar to Kemmerer soil but is deep, and <br />Pinelli soils make up the other 15 percent. <br />Kemmerer soil is a moderately deep, well drained soil. It is formed in weathered residuum from Mancos <br />shale. <br />Typically the surface layer is a light brownish gray silty clay loam about 3 inches thick. The substratum is <br />a light brownish gray silty clay and overlies soft Mancos shale at a depth of 28 inches. <br />Permeability is slow and available water capacity is low. Surface runoff is rapid, and erosion hazard is <br />moderate. <br />Moyerson soil is a shallow, well drained soil. It is formed in residuum in Mancos shale. <br />Rule 2 Permits 2.04.9-6 Revision Date: 6/23/08 <br />Revision No.: MR-91