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~. 816.?1-.25 TOPSOIL P.°.OTECTI0:1 (v2,np.816-6 to 816-22) .~. Description o° t'.;e Lxistir.g Environment The soils found in the amine plan `or Twen_•r.ile Energy :`.fines :;o . Park areas on ":aps 28, 29, and J~ broadly classified soil complexes borolls-3oro11ic Car..bor_zids and Cryic Paleboroils. area are delineated and ?, and Ec?c~an. respectively. Two exist: Topic Pa'_e- r.rgic Crycborolls- Typic Paleboroils - 3croLLic Camborthids The soils of this unit occur prig=_rily on up'_ands ant formed in materials we_tzered in place `rpm so.`.t shale. Slopes are gentle to mod=_rately steel at elevations ranging from 7,000 to 3,000 feet. 'lean soil tempera- ture is about 45 to ~i°=. These c'_ayey soils are ^oderately deep to deea, well drained, an'_ usually contain less than 35 percent rocL fragments. Depth to rippable bedrock ranges from 20 to over 60 inches. Permea5ility is slow, shrinY.-swell potential is high, and potential frost action is moder_te to high. Thes=_ soils are used for ran~el_nd, non-irriga[ed cropl=_nd, and for irrigated hay and pasturel_~d. ::alive vege- tation is mostly big sagebrush, oaf:brush, Idaho fescue, mountain biome and bluegr=_ss. In some areas, aspen dominates. argic CryoboroLls - Cryic Paleboroils Soils of this unit primarily occupy mountainsides and ridges. They formed in materials weatiered in place from sandstone or shale at elevations ranging =rpm 7,500 to 8,500 :net. :?e an soil temper=_ture is about 40 to 45°F These loamy soils are moderately Seep to deep, well drained, and usual2 contain less t`.an 35 percent rock fragments, Sul someti-es :,fill contain up 35 percent. Depth to bedroc6: is usual'_y betreen 20 to 60 inches, but in some ~?aces is deeper than o0 inches Shrink-swell potential is moderate an3 potential `_rost action is roderate to h-:ai. These soils are used almost entirely as rangeland and wildli`e habitat. Vegetation is mostly Ga-'pel pal:, big sagebrush, Idaho ~eSCUe, ::heaC grasses and 71na ~r3S3°-.i There 2re a few areas of Ponderosa Pine and aspen.