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Appendix L <br />Map Unit Description (Brief, Generated) <br />Douglas -Plateau Area, Colorado, Parts of Garfield and Mesa Counties <br />Map unit: 65 - Torriorthents, cool -Rock outcrop complex, 35 to 90 percent slopes <br />Component: Rock outcrop (40%) <br />Generated brief soil descriptions are created for major soil components. The Rock outcrop is a miscellaneous <br />area. <br />Map unit: 66 - Torriorthents, warm -Rock outcrop complex, 35 to 90 percent slopes <br />Component: Torriorthents, warm (50%) <br />The Torriorthents, warm component makes up 50 percent of the map unit. Slopes are 35 to 90 percent. This <br />component is on canyons, ridges, hills, mountains. The parent material consists of colluvium derived from <br />limestone and siltstone and/or colluvium derived from sandstone and shale and/or residuum weathered from <br />limestone and siltstone andlor residuum weathered from sandstone and shale. Depth to a root restrictive layer, <br />bedrock, lithic, is 4 to 60 inches. The natural drainage class is well drained. Water movement in the most <br />restrictive layer is moderately high. Available water to a depth of 60 inches is very low. Shrink -swell potential is <br />low. This soil is not flooded. It is not ponded. There is no zone of water saturation within a depth of 72 inches. <br />Organic matter content in the surface horizon is about 1 percent. Nonirrigated land capability classification is <br />7e. This soil does not meet hydric criteria. The calcium carbonate equivalent within 40 inches, typically, does <br />not exceed 10 percent. The soil has a slightly saline horizon within 30 inches of the soil surface. <br />Component: Rock outcrop (40%) <br />Generated brief soil descriptions are created for major soil components. The Rock outcrop is a miscellaneous <br />area. <br />Map unit: 67 - Tosca channery loam, 25 to 80 percent slopes <br />Component: Tosca (80%) <br />The Tosca component makes up 80 percent of the map unit. Slopes are 25 to 80 percent. This component is on <br />mountains. The parent material consists of green river colluvium derived from shale. Depth to a root restrictive <br />layer is greater than 60 inches. The natural drainage class is well drained. Water movement in the most <br />restrictive layer is moderately high. Available water to a depth of 60 inches is low. Shrink -swell potential is low. <br />This soil is not flooded. it is not ponded. There is no zone of water saturation within a depth of 72 inches. <br />Organic matter content in the surface horizon is about 2 percent. This component is in the R048AY238CO <br />Brushy Loam ecological site. Nonirrigated land capability classification is 7e. This soil does not meet hydric <br />criteria. The calcium carbonate equivalent within 40 inches, typically, does not exceed 28 percent. The soil has <br />a slightly sodic horizon within 30 inches of the soil surface. <br />USDA Natural Resources <br />Survey Area Version: 4 <br />Conservation Service Survey Area Version Date: 12/05/2006 <br />Page 3 <br />