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09/14/2008 15:01 19703456610 WASHINGTON COUNTY PAGE 02
<br />Washington County, Colorado
<br />Increase the water intake rate of the soils. Seeding is
<br />suited to this unit.
<br />If this unit is used for windbreaks and environmental
<br />plantings, the main limitations are low precipitation, slow
<br />permeability, and depth to rock in the Renohill soil.
<br />Fallowing in summer, cultivating for weed control, and
<br />selecting adapted plants are necessary to insure the
<br />establishment and survival of seedlings. If necessary,
<br />supplemental irrigation should be provided when planting
<br />and during dry periods. Planting on the contour
<br />conserves moisture. Suitable trees for planting are
<br />Rocky Mountain juniper, eastern redcedar, Siberian elm,
<br />and Russian-olive. Suitable shrubs are skunkbush
<br />sumac, lilac, Siberian peashrub, and American plum-
<br />This unit is poorly suited to homesite development. If
<br />the Renohill soil is used for homesite development, the
<br />main limitations are depth to rock, slow permeability, and
<br />the shrink-swell potential. If the Manzanola soil is used
<br />for homesite development, the main limitations are stow
<br />permeability and the shrink-swell potential. Excavating
<br />increases the risk of erosion. Only the part of the site
<br />that is used for construction should be disturbed.
<br />Structures to divert runoff are needed if buildings and
<br />roads are constructed.
<br />The Manzanola soil is more suitable for septic tank
<br />absorption fields than the Renohill soil. Absorption lines
<br />should be placed below the slowly permeable layer-
<br />Increasing the size of the absorption field helps to
<br />compensate for the slow permeability-
<br />If buildings are constructed on these soils, the effects
<br />of shrinking and swelling are reduced by using an
<br />appropriate engineering design for foundations and
<br />footings and by diverting runoff away from buildings.
<br />Roads and streets should be designed to offset the
<br />limited ability of the soils in this unit to support a bad.
<br />This map unit is in capability subclass IVe, irrigated
<br />and nonirrigated. It is in the Clayey Plains range site.
<br />64-x-Sampson loam This deep, well drained soil is on
<br />terraces intermittent streams. It formed in calcareous,
<br />loamy alluvium. Slope is 0 to 2 percent. Areas generally
<br />are elongated and are 20 to 480 acres.
<br />Typically, the surface layer is grayish brown loam
<br />about 4 inches thick. The upper part of the subsoil is
<br />grayish brown clay loam 36 inches thick, and the lower
<br />part to a depth of 60 inches or more is light brownish
<br />gray loam. In some areas of similar included soils, the
<br />surface layer is clay loam. In a few small areas of similar
<br />soils along Surveyor Creek, the surface layer is fine
<br />loam-
<br />Included in this unit are small areas of Bridoeeort silt
<br />Ig am on flood plains. Included areas make up about 10
<br />percent of the total acreage.
<br />ermeability of this Sampson soil is moderate.
<br />Available water capacity is high. Runoff is slow, and the
<br />hazard of water erosion is slight- Effective rooting depth
<br />5
<br />is 60 inches or more. The hazard of soil blowing is
<br />moderate.
<br />This unit is used mainly for grazing and nonirrigated
<br />crops. It is also used for irrigated crops-
<br />This unit is well suited to adapted nonirrigated crops. I
<br />is limited mainly by low precipitation and the hazard of
<br />soil blowing. Because precipitation is not sufficient for
<br />annual cropping, a cropping system that includes
<br />planting small grain and fallowing in summer is most
<br />suitable.
<br />Maintaining crop residue on or near the surface
<br />reduces runoff and soil blowing and helps to maintain
<br />soil tilth and the organic matter content. Tillage should
<br />be kept to a minimum. All tillage should be on the
<br />contour or across the slope. Diversions and grassed
<br />waterways are necessary in some places-
<br />Furrow, border, corrugation, and sprinkler irrigation
<br />systems are suited to this unit. Water should be applied
<br />at a rate that insures optimum production without
<br />increasing deep percolation, runoff, and erosion. In
<br />sloping areas, leveling is necessary to efficiently apply
<br />and remove water.
<br />Tilth and fertility can be improved by returning crop
<br />residue to the soil. Applying nitrogen and phosphorus
<br />increases production.
<br />The potential plant community on this unit is mainly
<br />blue grams, buffalograss, western wheatgrass, and
<br />needleandthread.
<br />Mechanical practices such as pitting and contour
<br />furrowing can be used to reduce runoff and increase the
<br />water intake rate of the soil. Seeding is suited to this
<br />unit.
<br />This unit is well suited to windbreaks and
<br />environmental plantings. It has few limitations. Fallowinc
<br />in summer, cultivating for weed control, and selecting
<br />adapted plants help to insure establishment and survive
<br />of seedlings- Supplemental irrigation may be needed
<br />when planting and during dry periods. Among the trees
<br />that are suitable for planting are Rocky Mountain juniper
<br />eastern redcedar, ponderosa pine, Siberian elm,
<br />Russian-olive, and hackberry. Among the shrubs are
<br />skunkbush sumac, lilac, Siberian peashrub, and
<br />American elm.
<br />If this unit is used for homesite development, the mail
<br />limitation is shrink-swell potential. The effects of
<br />shrinking and swelling can be minimized by using prope
<br />engineering designs and by backfilling excavations with
<br />material that has low shrink-swell potential. Frost action
<br />potential is a limitation for the maintenance of roads,
<br />streets, driveways, and sidewalks.
<br />This map unit is in capability subclasses Ile, irrigated,
<br />and 111c, nonirrigated. It Is in the Loamy Plains range sit(
<br />65-Safanta loam. This deep, well drained soil is on
<br />terraces. It formed in alluvium. Slope is 0 to 2 percent.
<br />Areas are irregular in shape and are 40 to 600 acres.
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