PERMFILE107596 - Laserfiche WebLink

Home Browse Search

i~ 10 + SOIL SURVEY i poles for fences, corrals, and power lines. Excessive slope limits the types of equipment used during timber harvest and makes reforestation difficult. Extreme care should be taken to prevent erosion of skid trails and access roads. Excessive slope and lazge atones are the moat limiting soil properties to be considered in the design of access roads and recreation homesite subdivisions. Snow removal becomes an increasingly greater problem ae more homes are built. Slope stabilization ie difficult even where homes are constructed on nearly level pads. Surface runoff resulting from snowmelt increases the erosion hazard on cut and fill slopes. Seeding of vegetation minimizes the erosion hazard, but establishing a stand is difficult. Homes should be designed to utilize existing slope and keep foundation cute to a minimum. Roads should be designed to keep cut and fill slopes to a minimum and provide drainage outlets for excessive snowmelt. Excava- tions and cuts and fills aze hard to make in Frisco soils because of large stones throughout the profile. All- weather asphalt surfaces are impractical unless provisions are made to offset frost action. Woodland wildlife includes mule deer, elk, grouse, snowshoe hare, white-tailed ptarmigan, yellow-bellied marmot, and chipmunks. The natural migration of deer and elk herds has been disturbed in many areas now used far recreation homesite subdivisions. Capability subclass V IIe. 6-Gravel pits. Gravel pile are open excavations from which sand and gravel have been removed. Sand and gravel are valuable mainly as the coarse aggregates used in construction. Capability class VIII. 7C-Grenadier gravelly loam, 0 to 6 percent slopes. This ie a deep, well drained, nearly level to gently eloping soil on mountainsides. It formed in glacial drift derived from a variety of rocks. The average annual precipitation is about 25 inches, the average annual air temperature is about 32 degrees F, and the frost-free season is about 30 to 50 days. Elevation is 9,000 to 13,000 feet. Small areas of Frisco, Peeler, and Leadville soils are in- cluded in mapping. Small areas of Cumulic Cryaquolls and Hiatic Cryaquolls also are included. Typically, the Grenadier soil has a duff layer of needles and twigs about 3 inches thick The mineral surface layer ie dark brown gravelly loam about 3 inchee thick. The subsoil is strong brown gravelly sandy clay loam about 13 inchee thick. The substratum is brown very cobbly sandy loam to a depth of 60 inches or more. Permeability is moderate and the available water capacity is medium. Surface runoff is medium. The hazard of wind and water erosion ie alight. Most of the acreage is woodland that ie used for recrea- tion, wildlife, and timber production. A cold climate and a short growing season limit the production oY introduced grasses and wood crape. The dominant native vegetation consists of Engelmann spruce, subalpine fir, lodgepole pine, and a sparse un- derstory of grasses, shrubs, and forbs. This soil is suited to the production of lodgepole pine. A fully-stocked, even-aged stand of 80-year-old trees can produce 4,900 board feet of merchantable timber per acre. There are no restrictions on normal timber harvest, but reforestation is slow due to the cold climate. Small stones throughout the profile are to be con- sidered in the design of access roads and recreation homesite subdivisions. The stones interfere with excava- tions and cuts and filLg Cor foundations and access roads. Seeding of vegetation is difficult due to soil acidity. Roads should be designed to provide drainage outlets for excessive snowmelt. All-weather asphalt surfaces are im- practical unless provisions are made to offset frost action. Woodland wildlife includes mule deer, elk, blue grouse, snowshoe hare, white-tailed ptarmigan, yellow-bellied marmot, and chipmunks. Capability subclass VIIs. 7D-Grenadier gravelly loam, 6 to 15 percent slopes. This is a deep, well drained, moderately sloping to strongly eloping soil on glacial fans. IC formed in glacial drift derived from a variety of rocks. The average annual precipitation is about 25 inches, the average annual av temperature is about 32 degrees F, and the frost-free season is about 30 to 50 days. Elevation is 9,000 to 13,000 feet. Small areas of Frisco, Peeler, and Leadville soils are in- cluded in mapping. Small areas of Cumulic Cryaquolls and Histic Cryaquolls also are included. Typically, the surface is covered with a duff layer of needles and twigs about 3 inches thick. The mineral sur- face Layer is dazk brown gravelly loam about 3 inchee thick The subsurface layer is pink gravelly loam about 3 inches thick. The subsoil is strong brown gravelly sandy clay loam about 13 inches thick. The substratum is brown very cobbly sandy loam to a depth of 60 inches or more. Permeability is moderate, and the available water capacity is medium. Surface runoff is medium. The hazard of wind erosion is slight, and the hazard of water erosion ie moderate. Moat of the acreage is woodland that is used for recrea- tion, wildlife, and timber production. A cold climate and a short growing season limit the production of introduced grasses and wood crops. The dominant native vegetation consists of Engelmann spruce, aubalpine fir, lodgepole pine, and a spares un- deratory of grasses, shrubs, and forbs. This soil is suited to the production of lodgepole pine. It can produce 4,400 board feet of merchantable timber per acre from afully-stocked, even-aged stand of 80-year-old trees. There are no restrictions on normal timber harvest, but care should be taken to prevent erosion of skid trails and access roads. Excessive elope and small atones are the moat limiting soil properties to be considered in the design of access roads and recreation homesite subdivisions. Snow removal becomes an increasingly greater problem ae more homes are built. Slope stabilization is difficult even where homes are constructed on nearly level pads. Surface runoff resulting from snowmelt increases the erosion hazard on