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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 at the north end of the <br />permit area. A small area (less than 5 acres} of this series was disturbed by the access road. <br />No additional activities are planned on areas with this soil series, therefore detailed chemical <br />and physical data has not been collected for this soil type. The soil developed in mixed <br />aeolian materials and is found on gently to moderately sloping terraces. The average annual <br />precipitation ranges from 12 to IS inches, -the average annual soil temperature is 42°F to <br />47°F, and the frost-free season is 7~ to 95 days. <br />Included with this soil in mapping are a few small areas of Yamac and Pinelli soils. <br />Typically the surface layer is a grayish brown loam about 5 inches thick. The subsoil is a <br />light brownish gray clay loam about 16 inches thick. The substratum is a Tight grayish brown <br />loam to a depth of about 60 inches. <br />Permeability is slow. The available water capacity is high. Effective rooting depth is 60 <br />inches or more. Surface runoff is medium, and the erosion hazard is moderate from wind and <br />water. <br />Most of this mapping unit is cultivated and used for non-irrigated small grains. Present and <br />potential productivity of this soil is fair. <br />32D-Yamac Loam, 5 to 15 Percent Slopes <br />This is a deep, well drained soil that occurs at the northern edge of the permit area. A portion <br />of the unit train loadout facility was constructed on an area of this soil series. No additional <br />disturbances are anticipated on areas with this soil series, therefore detailed data on chemical <br />and physical characteristics are not presented. The soil developed in weathered sandstone, <br />siltstone and windlain materials, and is found on upland ridges and benches. The average <br />annual precipitation ranges from 12 to ] 5 inches, the average annual soil temperature is 42° <br />to 47°F, and the frost-free season is 75 to 95 days. <br />Included with this soil in mapping are a few small areas of Forelle soils. <br />Typically the surface layer is a pale brown loam about five inches thick. The subsoil is a pale <br />brown loam about 10 inches thick. The substratum is a pale brown to very pate brown loam <br />to a depth of about 60 inches. <br /> <br />2.04.9-6 <br />