2017-02-03_PERMIT FILE - C1980004 (2)

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2.04.9 Soils Resource Information MAP UNIT: NIBE - NIHILL LOAM, 5 TO 35 PERCENT SLOPES This map unit is on gently sloping to moderately steep fans, draws, terraces and gullies. The slope is 5 to 35 percent. The native vegetation is mainly a greasewood - shrubland community or a juniper - woodland community. Included in this map unit is about 20 percent Torriorthents ranging from shallow to moderately deep in loamy -skeletal and sandyskeletal families. Included areas make up about 20 percent of the total acreage. Typically, the surface layer of the Nihill soil is a pale brown to grayish brown loam or gravelly loam about 8 inches thick. The substratum to a depth of 60 inches or more is light brownish gray, pale brown, or light brownish gray gravelly to very gravelly loam, sandy loam, or clay loam. Permeability of the Nihill soil is moderately rapid. Available water capacity is moderately low. Effective rooting depth is 60 inches. Runoff is rapid and the erosion hazard for water is moderate. Wind erosion hazard is medium. The unit is mainly used for rangeland. It is also used for wildlife habitat. The present plant community is mainly juniper, big sage, and summer -cypress; grasses include cheat grass, western wheat grass, and salina wild rye. The potential productivity is 1,500/900/800 pounds of air-dry vegetation in favorable/normal/and unfavorable years, respectively. This map unit is in capability unit IVe dryland on 8 to 15 percent slopes and Vle dryland on 15 to 35 percent slopes, rolling loam range site4. MAP UNIT: RIAB, RIVRA GRAVELLY SANDY LOAM VARIANT, 0 TO 8 PERCENT SLOPES This map unit is on nearly level to gently sloping low terraces and flood plains. The slope is 0 to 8 percent. The native vegetation is mainly a greasewood-shrubland community Included in this map unit is about 5 percent Nihill below sandstone outcrop. Typically, the surface layer of the Rivra variant is a pale brown or light brownish gray gravelly sandy loam about 8 inches thick. The substratum to a depth of 60 inches or more is light brownish gray to pale brown, stratified very gravelly loamy sands and loamy coarse sands. Permeability of the Rivra variant is very rapid. Available water capacity is moderate. Effective rooting depth is 40 to 60 inches. Runoff is slow, and the erosion hazard for water is medium. Wind erosion hazard is moderate to moderately high. The unit is mainly used for rangeland and wildlife habitat. It is also used for pasture. 4 Range site established for Rifle area Soil Survey. PR -02 2.04-43 10/12