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MAPPING UNIT 4G - IRIGUL CHANNERRY LOAM <br />• 50 to 75 PERCENT SLOPES <br />This is a shallow, well-drained soil found on upland ridges and <br />mountain slopes between 7800 to 8700 feet elevation. It formed <br />in residuum from sandstone and marlstone. The average annual <br />precipitation is about 20 inches and comes mostly as snow. The <br />average annual air temperature is about 40 degrees F., and the <br />average frost-free period is less than 75 days. <br />Typically, an organic layer 2 to 3 inches thick is on the surface. <br />The surface layer of the Irigul soil is grayish brown, channery <br />loam about 6 inches thick. The underlying material is yellowish <br />brown, extremely channery, sandy clay loam about 11 inches. Reac- <br />tion throughout the profile is neutral to mildly alkaline. <br />The permeability of Irigul soil is moderate with an effective <br />. rooting depth of 10 to 20 inches. The available water capacity <br />is low due to a high volume of channery. The surface runoff is <br />rapid and the erosion hazard high. It has a capability subclass <br />VIIe. <br />CLASSIFICATION OF MAJOR COMPONENTS <br />Irigul channery loam, 50 to 75 percent slopes; Family Loamy-skeletal <br />Mixed Cryic Pachic Paleborolls. <br />INCLUSIONS <br />Included with this soil mapping unit are areas of soils that are <br />greater than 20 inches deep to bedrock, some small areas of soils <br />with light colored surfaces, and some small areas of Rock Outcrop. <br /> <br />I-7 <br />