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250 - Cerri - Herm complex <br />250 • Certo - Hertn complex, 0 to 15 percerrt slopes <br />• SETTING <br />Landforms: benches, mesa tops and side slopes <br />Elevation: 7,000 to 8,200 feet <br />Mean annual air temperature: 41 to 43 degrees F <br />Mean annual precipitation: 16 to 20 inches <br />Frost-free period: 85 to 95 days <br />CHARACTEAISTICS OF THE CERRO SO{L <br />Parent material: residuum from Mancos shale <br />Dominant native plants: western wheatgrass, Kentucky bluegrass, mulesear, muttongrass <br />Typical Profile <br />0 to 9 inches -grayish brown clay loam <br />9 to 17 inches -grayish brown silty clay loam <br />17 to 29 inches -grayish brown clay <br />29 to 65 inches -light brownish gray clay <br />Depth class: very deep <br />Drainage class: well drained <br />Permeability: slow <br />Available water capacity: high <br />. Potential rooting depth: 15 to 24 inches <br />Surface runoff: very slow to very rapid <br />Hazard of water erosion: low <br />Shrink-swell potential: high <br />Mass movement potential: low <br />CHARACTERISTICS OF THE HERM SOIL <br /> <br />Parent material: alluvium and residuum from interbedded sandstone and shale <br />Dominant native plants: Gambel oak, Kentucky bluegrass, elk sedge, rabbitbrush <br />Typical Profile <br />0 to 9 inches -dark grayish brown clay loam <br />9 to 14 inches -grayish brown clay <br />14 to 60 inches -pate brown clay <br />Depth class: very deep <br />Drainage class: well drained <br />Permeability: slow <br />Available water capacity: moderate <br />Potential rooting depth: 10 to 20 inches <br />Surface runoff: very slow to very rapid <br />. Hazard of water erosion: low to high <br />Shrink-swell potential: high <br />Mass movement potential: tow to moderate <br />Soils Description Report -West Elk Mine <br />December 1994 WESTEC 61 <br />