2013-06-18_REVISION - M1987164 (9)

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years of average rainfall; and failures during years of below average rainfall. During the low rainfall years the soil must be protected even though there can be little or no expectancy of a marketable crop. Special treatments and practices to prevent soil blowing, conserve moisture, and maintain soil productivity are required. Sometimes crops must be planted or emergency tillage used for the primary purpose of maintaining the soil during years of low rainfall. Shermap loam, cool, 40 to 65 percent slopes The Shermap, cool component occupies a majority of the permit area. Slopes are 40 to 65 percent. This component is on hills. The parent material consists of eolian deposits derived from sandstone and shale and /or slope alluvium derived from sandstone. Depth to a root restrictive layer is greater than 60 inches. The natural drainage class is well drained. Water movement in the most restrictive layer is moderately high. Available water to a depth of 60 inches is high. Shrink - swell potential is moderate. This soil is not flooded. It is not ponded. There is no zone of water saturation within a depth of 72 inches. Organic matter content in the surface horizon is about 2 percent. This component is in the R048AY238CO Brushy Loam ecological site. Nonirrigated land capability classification is 6e. This soil does not meet hydric criteria. Breezebasin loam, 0 to 3 percent slopes The Breezebasin component occupies a small portion of the permit area. Slopes are 0 to 3 percent. The landform is flood plains and flood plain steps. The parent material consists of mixed alluvium. The soil drainage class is moderately well drained. The capacity of the most limiting layer to transmit water is moderately high. The depth to the water table is about 30 to 60 inches. The frequency of flooding is rare. The frequency of ponding is zero. The maximum calcium carbonate is zero percent. The available water capacity is moderate (about 8.5 inches). Nonirrigated land and irrigated land capability classification is 4w. Soils in class 4 have very severe limitations that restrict the choice of plants, require very careful management, or both. When these soils are cultivated, more careful management is required and conservation practices are more difficult to apply and maintain. Soils in class 4 may be used for crops, pasture, woodland, range, or wildlife food and cover. Soils in class IV may be well suited to only two or three of the common crops or the harvest produced may be low in relation to inputs over a long period of time. Use for cultivated crops is limited as a result of the effects of excessive wetness Hayden Gravel Pit, May 2013 I -4