PERMFILE107596 - Laserfiche WebLink

Home Browse Search

SUMMtT COUNTY AREA, COLORAIlO cut and fill slopes. Seeding minimizes the erosion hazard, but establishing vegetation is difficult. Homes should be designed to utilize existing elope and keep foundation cuts to a minimum and provide drainage outlets for excessive enowmelt. Small stones throughout the profile interfere with excavations and cuts snd fills. All-weather asphalt surfaces are impractical 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. The natural migration of deer and elk herds has been disturbed in many areas now used for recreation homesite subdivisions. Capability subclass V1Is. 7F-Grenadier gravelly loam, 15 to 55 percent elopes. This is a deep, well drained, moderately steep to steep soil on mountain side elopes and ridges. It formed in gla- cial drift derived from a variety of rocks. The average an- nual precipitation is about 25 inches, the average annual atr temperature is about 32 degrees F, and the frost-free season is 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 aze included. Areas of a similar soil that has no subsurface layer and is above timberline are also included. Typically, the surface is covered with a duff layer of needles and twigs about 3 inches thick. The mineral sur- Lce layer is dark brown gravelly loam about 3 inches thick. The subsurface layer is pink gravelly loam about 3 aches thick. The subsoil is strong brown gravelly Bandy da~~ loam about 13 inches thick. The substratum is brown eery cobbly sandy loam to a depth of 60 inches or more. Permeability is moderate, and the available water capacity is medium. Surface runoff ie medium. The hazard of wind erosion is alight, and the hazazd of water erosion i high. !lost of the acreage is woodland that is used for recrea- tion, widlife, and timber production. A cold climate and a short growing season limit the production of introduced gasses and wood crops. The dominant native vegetation consists of Engehnann spruce, aubalpine fir, lodgepole pine, and a sparse un- den~ton• of grasses, shrubs, and farbs. This soil is suited to the production of lodgepole pine. It can Produce 4,800 board feet of merchantable timber per see from afully-stocked, even-aged stand of 80-yeaz-old sees. Excessive elope limits the types of equipment used ~'^nR timber harvest and makes reforestation difficult. E1:n•me care should be taken to prevent erosion of skid tnulF and access roads. Excessive elope and small atones are the moat limiting ~ Properties to be considered in the design of access ~' and recreation homesite eubdiviaione. Snow removal ~comeF an increasingly greater problem as more homes aR built. Slope stabilization is difficult even where homes an instructed on nearly level pads. Surface runoff ~"'htng from snowmelt increases the erosion hazard on 11 cut and fill elopes. Seeding minimizes the erosion hazard, but establishing vegetation is difficult. Homes should be designed to utilize existing slope, keep foundation cuts to a minimum, and provide drainage outlets for excessive enowmelt. Small stones throughout the profile interfere with excavation and making cuts and fills. All-weather asphalt surfaces are impractical 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. The natural migration of deer and elk herds has been disturbed in many areas now used for recreation homesite subdivisions. Capability subclass VIIs. BB-Handran graveNy loam, 0 to 3 percent elopes. This is a deep, well drained, nearly level soil on terraces. It formed in alluvial deposits derived from a variety of rocks. The average annual precipitation is about 15 inches, the average annual atr temperature is about 37 degrees F, and the frost-free season is 30 to 75 days. Elevation is 7,500 to 9,000 feet. Small areas of Quander soil and Cumulic Cryaquolls are included in mapping. Typically, the surface layer is brown gravelly loam about 6 inches thick. The next layer is brown gravelly sandy loam about 9 inches thick. The underlying material is brown very cobbly sandy loam to a depth of 60 inches or more. Permeability is rapid, and the available water capacity is medium. Surface runoff is slow. The hazard of wind and water erosion is alight. Most of the acreage is rangeland, but some areas are used for irrigated grass hay, recreation, and wildlife. A cold climate and a short growing season limit production and preclude use of this soil as cropland. Management of the Handran soils for range requires a deferred grazing system and limited brush control. Where they are irrigated, these soils need proper water manage- ment to prevent over-irrigation. Grasses recommended for seeding include western wheatgrass, slender wheat- grass, mountain brome, Arizona fescue, big bluegrass, and bluebunch wheatgrass. The dominant native vegetation coneista of western wheatgrass, fescue, serviceberry, an- telope bitterbrnsh, and big sagebrush. The total annual production averages about 1,500 pounds of air-dry forage per acre. Excessive amounts of small and large stones and rapid permeability aze the most limiting soil properties to be considered in the design of access roads, septic systems, and recreation homesite subdivisions (fig. 1). Stones in the soil profile interfere with excavations and cuts and fills. Leach fields should be designed carefully to eliminate the hazard of ground water pollution. All-weather asphalt surfaces are impractical unless provisions are made to offset frost action. RangeL;nd wildlife includes mule deer, sage grouse, white-tailed jackrabbit, coyote, mourning dove, ground squirrel, and yellow-bellied marmot. Capability subclass YIIs.