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C~ <br />CLASSIFICATION OF MAJOR COMPONENTS <br />Irigul-Starman channery loams, 5 to 50 percent slopes; Families <br />Loamy - skeletal, Mixed Lithic Cryoborolls and Loamy - skeletal, <br />Mixed (calcareous), Mesic Ustic Torriorthents. <br />INCLUSIONS <br />Small areas of Parchute soil are included in the mapping unit. <br />These occupy the small depressions on the ridge crests and make <br />up to 30 percent of the mapping unit. <br />MAPPING UNIT X33BC - ARVADA LOAM <br />1 TO 6 PERCENT SLOPES <br />• This is a deep, well-drained soil on slightly sloping fans and <br />terraces between 5100 to 6200 feet elevation. It formed in highly <br />saline alluvium derived from sandstone and shale. The average <br />annual precipitation is above 12 inches, average annual air tem- <br />perature is about 48 degrees F., and the average frost-free period <br />is about 120 days. <br />Typically, the surface layer is pale brown loam about 3 inches <br />thick. The subsurface layer is brown, silty clay loam about 43 <br />inches thick. <br /> <br />Permeability of the Arvada soil is moderately slow. The effective <br />rooting depth is 60 inches or more, the organic surface matter <br />content low and the available water capacity high. The surface <br />runoff is moderately rapid and the erosion hazard is high. It <br />has a capability subclass VIIs. <br />I-12 <br />