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<br />120 - Yamac loam, 2 to 15 percent slopes. <br />The Yamac soil is deep and well-drained. It developed from calcareous loamy <br />alluvium on upland fans and mesas. Small areas of Forelle, Piceance and Rentsac <br />soils were included in mapping. Forelle soils are deep. Piceance soils are <br />moderately deep. Rentsac soils are shallow and channery. These soils occupy <br />less than 15 percent of the ;napping unit. <br />In a typical profile, the surface layer is brown loam about 4 inches thick. <br />The subsoil is pale brown loam about 10 inches thick. Tha substratum is vary <br />pale brown and pale brown loam to a depth of 60 inches or more. <br />The Yamac soil has moderate permeability and medium runoff. The erosion <br />hazard is slight. Available waterholding capacity is high. Effective rooting <br />depth is 40 to 50 inches. <br />• This soil is used for livestock grazing and wildlife habitat. The vegetation <br />is primarily western wheatgrass, big sagebrush, rabbitbrush and winterfat with <br />areas of brome and annual fortis. <br />The average depth of suitable topsoil material is 60 inches. This material <br />is rated fair to good with suitability decreasing with depth. <br />u <br />