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Soil and ecological land unit survey <br />Substratum layer(s): <br />19 to 60 inches - light yellowish brown, very <br />cobbly loamy sand. <br />Zillman <br />Surface layer(s): <br />0 to 10 inches.- brown, very stony sandy loam. <br />Subsoil layer(s): <br />10 to 22 inches - light yellowish brown, very <br />stony sandy clay loam. <br />Substratum layer(s): <br />22 to 60 inches - very pale brown, extremely <br />stony sandy loam. <br />SOIL PROPERTIES AND QUALITIES <br />Tecolote <br />Effective rooting depth: greater than 60 inches. <br />Drainage class: somewhat excessively. <br />Depth to seasonal high water table: greater <br />than 6 feet. <br />Available water capacity. low. <br />Permeability. rapid. <br />Runoff. slow. <br />Zillman <br />Effective rooting depth: greater than 60 inches. <br />Drainage class: well. <br />Depth to seasonal high water table: greater <br />than 6 feet. <br />Available water capacity: low. <br />Permeability. moderate. <br />Runoff.• slow. <br />VEGETATION <br />Potential natural communities: <br />Tecolote: ponderosa pine/Arizona fescue <br />(Pipo/Fearl ). <br />Zillman: Arizona fescue/mountain muhly <br />(Fearl/Mumol ). <br />Sera/ stages: dominated by plants of the <br />respective potential natural communities. Most <br />disturbances have been caused by historic and <br />current livestock grazing. These disturbances <br />have included the introduction of non-native <br />grasses and forbs. Cheatgrass, rabbitbrush, <br />horsebrush, fringed sage, and snakeweed are <br />some of the increaser species. <br />Present vegetation: dominated by plants of the <br />respective potential natural communities and <br />introduced species. <br />USE AND MANAGEMENT CONSIDERATIONS <br />Major uses. homesites, livestock grazing, wildlife <br />habitat, and watershed. <br />Mass movement potential. <br />Landslides: low. <br />Debris flows: low. <br />Snow avalanche: low. <br />Sediment delivery efficiency. low. <br />Road and trail limitations: <br />Cut and fill slope stability <br />Tecolote: slight. <br />Zillman: slight. <br />Improved unsurfaced roads: <br />Tecolote: slight. <br />Zillman: slight. <br />Offroad vehicle roads and trails: <br />Tecolote: slight. <br />Zillman: slight. <br />Foot trails and paths: <br />Tecolote: slight. <br />Zillman: slight. <br />Revegetation limitations: <br />Tecolote: moderate- low available water <br />capacity. <br />Zillman: moderate- low available water capacity. <br />Revegetation considerations: Trees are slow to <br />return after a disturbance. Planting grasses and <br />forbs have the best chance of success. Mulch or <br />similar treatment will protect the soil from erosion, <br />help conserve soil moisture, and protect <br />emerging plant seedlings. <br />Timber management considerations: Plant <br />trees that are drought tolerant or revegetate with <br />grasses and forbs. Trees to plant include <br />ponderosa pine and Rocky Mountain juniper. <br />Other management considerations: This map <br />unit is also used for livestock grazing. <br />Maintaining and enhancing the potential natural <br />plant community can reduce the erosion hazard <br />and maintain sustained multiple use. At the <br />mouth of Chalk Creek Canyon this map unit has <br />very deep Ustorthents soil. <br />Acid precipitation buffering capacity: moderate. <br />Map Unit: 150F-Handran family, 0 to 15 percent <br />slopes. <br />Ecological Land Unit: 150F-sagebrush, <br />Thurber fescue, and Idaho fescue on montane, <br />dry valleys, upland plains, and alluvial fans. <br />MAP UNIT SETTINGS <br />Location: throughout the survey area. <br />Landform: valleys, upland plains, and alluvial <br />fans. <br />Parent material: slope wash, alluvium, and glacial <br />till. <br />Geologic symbol. Qa, Qd and Td. <br />Elevation range: 8,500 to 10,500 feet. <br />Aspect., all. <br />Climatic zone: montane, dry. <br />Mean annual precipitation: 16 to 20 inches. <br />Page 40 DRAFT 3/31/2011