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230 -Haploborolls - Ustoehrepts -Rock outcrop complex <br />Surface runoff: very rapid <br />Hazard of water erosion: high <br />Shrink-swell potential: moderate <br />Mass movement potential: moderate <br />CHARACTERISTICS OF THE ROCK OUTCROP <br />Rock outcrop consists of large exposures of sandstone, andesite, rhyolite, and tuff parallel to the <br />surface and as cliffs, breaks, or escarpments. <br />COMPOSITION <br />Haploborolls soil and similar soils: 35 percent <br />Ustochrepts soils and similar soils: 30 percent <br />Rock outcrop: 25 percent <br />Contrasting inclusions: 10 percent <br />CONTRASTING INCLUSIONS <br />Five percent soils with less than 35 percent rock fragments in the particle size control section <br />Five percent rubble land at the base of the steeper areas <br />MAJOR USES <br />Wildlife, recreation <br />MAJOR MANAGEMENT FACTORS <br />Recreation <br />Haploborolls and Ustochreots <br />Soil-related factors: steep slopes, moderate shrink-swell potential, shallowness to bedrock in some <br />areas, surface stoniness in some areas, high soil erosion hazard, subsurface rock fragments, <br />moderate mass movement potential <br />Management considerations: <br />The steepness of slope limit the uses of this unit to wildlife habitat, limited recreation, watershed, <br />and scenic beauty. <br />Any construction activity on the steeper areas of this unit may trigger mass movement. <br />Steep slopes limit the use of this unit to a few paths and trails, which should extend across the <br />slope. <br />C~ <br />s <br />• <br />Soils Desedption Report -West Elk Mine <br />December 1994 WESTEC 52 <br />