2008-02-27_PERMIT FILE - M2008010

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Mud Creek Pit -Reclamation Permit Application -112 (C) Exhibits Page 40 of 67 Unit 137 Name Ustorthents, 12 to 65 percent slopes Description This map unit is a soil of shallow to very deep, well or somewhat excessively drained soil located on terrace escarpments, terraces and hills. Elevation is 6,200 to 7,400 feet. The average annual precipitation is 13 to 16 inches, the average annual air temperature is 46 to 50 degrees F, and the average frost-free period is 100 to 120 days. This map unit is 80 percent ustorthents and similar inclusions and 20 percent contrasting inclusions. Similar Inclusions Similar inclusions are made up of zig-zag soils on hills. Contrasting Inclusions This unit includes Collide soils on terraces, sideshow soils on alluvial fans and herm soils on hills. Vegetation The ecological site is Pinyon Juniper. The dominant vegetation includes 15 percent twoneedle pinyon, 15 percent Utah juniper 20 percent big sagebrush,10 percent muttongrass, 10 percent western wheatgrass and 5 percent Indian ricegrass. The potential production of native vegetation on these soils is 600 pounds on a normal year. Soil Management Implications Major uses are livestock grazing and wildlife habitat. Major management factors suitability for rangeland is poor, suitability for cropland is poor and suitability for building site development is poor. Notes Wind Erodibility Group: 8 Hydrologic Group: D Detailed description of soil (Ustorthents) The Ustorthents parent material is eolian material, residuum and aluvium from a mixed source. Ustorthents is well or somewhat excessively drained. Typically the top layer is 0 to 3 inches is a brown very cobbly loam. The next 3 to 14 inches are brown very cobbly loam. 14 to 36 inches is brown extremely cobbly loam. The next layer down to 60 inches is a brown very stony sand loam. The permeability of ustorthents is moderately slow to moderately rapid. The available water capacity is low to moderate. Potential rooting depth is 10 to 60 inches or more. Runoff is high to very high, the hazard of water erosion is severe. The shrink-swell potential is low. McStone Aggregates, LLC 15 FEB 2008 ©WASTELINE, INC 2008 PN 5006.1-4(009)