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28D-Forelle Loam. 3 to 12 Percent Slopes <br />• This is a deep, well drained soil that occurs in very limited areas <br />at the north end of the permit area. A small area (less than 5 <br />acres) of this series was disturbed by the access road. No <br />additional activities are. planned on areas with this soil series, <br />therefore detailed chemical and physical data has not been <br />collected for this soil type. The soil developed in mixed aeolian <br />materials and is found on gently to moderately sloping terraces. <br />The average annual precipitation ranges from 12 to 15 inches, the <br />average annual soil temperature is 42°F to 47°F, and the frost-free <br />season is 75 to 95 days. <br />Included with this soil in mapping are a few small areas of Yamac <br />and Pinelli soils. <br />Typically the surface layer is a grayish brown loam about 5 inches <br />thick. The subsoil is a light brownish gray clay loam about 16 <br />inches thick. The substratum is a light grayish brown loam to a <br />depth of about 60 inches. <br />Permeability is slow. The available water capacity is high. <br />Effective rooting depth is 60 inches or more. Surface runoff is <br />medium, and the erosion hazard is moderate from wind and water. <br />Most of this mapping unit is cultivated and used for non-irrigated <br />• small grains. Present and potential productivity of this soil is <br />fair. <br />32D-Yamac Loam. 5 to 15 Percent Slopes <br />This is a deep, well drained soil that occurs at the northern edge <br />of the permit area. A portion of the unit train loadout facility <br />was constructed on an area of this soil series. No additional <br />disturbances are anticipated on areas with this soil series, <br />therefore detailed data on chemical and physical characteristics <br />are not presented. The soil developed in weathered sandstone, <br />siltstone and windlain materials, and is found on upland ridges and <br />benches. The average annual precipitation ranges from 12 to 15 <br />inches, the average annual soil temperature is 42° to 47°F, and the <br />frost-free season is 75 to 95 days. <br />Included with this soil in mapping are a few small areas of Forelle <br />soils. <br />Typically the surface layer is a pale brown loam about five inches <br />thick. The subsoil is a pale brown loam about 10 inches thick. The <br />substratum is a pale brown to a very pale brown loam to a depth of <br />about 60 inches. <br />• <br />2.04.9-6 <br />