|
08/14/2008 15:01 19703456610
<br />Washington County, Colorado
<br />WASHINGTON COUNTY
<br />PAGE 05
<br />5:
<br />insure establishment and survival of seedlings. Planting
<br />on the contour conserves moisture. Supplemental
<br />irrigation may be needed when planting and during dry
<br />periods. Among the trees that are suitable for planting
<br />are Rocky Mountain juniper, eastern redcedar,
<br />ponderosa pine, Siberian elm, Russian-olive, and
<br />hackberry. Among the shrubs are skunkbush sumac,
<br />lilac, Siberian peashrub, and American plum.
<br />If this unit is used for homesite development, the main
<br />limitations are the hazard of water erosion and soil
<br />blowing and the steepness of slope. Excavation for
<br />roads and buildings increases the risks of erosion.
<br />Fevegetating disturbed areas around construction sites
<br />as soon as feasible helps to control soil blowing.
<br />If the soil in this unit is used for septic tank absorption
<br />fields, the limitations of moderate permeability can be
<br />overcome by increasing the size of the absorption field.
<br />Areas that are shallow to shale are not suitable for
<br />absorption fields. The effects of shrinking and swelling
<br />can be minimized by using proper engineering designs
<br />and by backfilling excavations with material that has low
<br />shrink-swell potential.
<br />This map unit is in capability subclasses Ille, irrigated,
<br />and IVe, nonirrigated_ It is in the Loamy Plains range slte.
<br />67-Stoneham loam, 6 to 9 percent slope. This
<br />deep, well drained soil is in gently rolling areas on plains.
<br />It formed in eolian sediment Areas are irregular in shape
<br />and are 20 to 200 acres.
<br />Typically, the surface layer is grayish brown loam 4
<br />inches thick. The subsoil is brown clay loam i 1 inches
<br />thick. The substratum to a depth of 60 inches or more is
<br />pale brown loam over fine sandy loam. In some areas of
<br />similar included soils, the surface layer is fine sandy
<br />loam,
<br />included in this unit are small areas of Eckley and
<br />Qrsa gravelly sandy loams on narrow ridges and rounded
<br />knolls and Platner loam and Ascalon sandy loam in level
<br />or slightly concave areas. Included areas make up about
<br />20 percent of the total acreage.
<br />Permeability of this Stoneham soil is moderate.
<br />Available water capacity is high. Effective rooting depth
<br />is 60 inches or more. Runoff is rapid, and the hazard of
<br />water erosion is high. The hazard of soil blowing is
<br />moderate.
<br />This unit is used for rangeland and nonirrigated crops,
<br />This unit is poorly suited to nonirrigated crops. It Is
<br />limited mainly by steepness of slope and the thin surface
<br />layer.
<br />The potential plant community on this unit is mainly
<br />blue grama, buffalograss, western wheatgrass, green
<br />needlegrass, and sedge.
<br />Mechanical treatment practices such as pitting and
<br />contour furrowing can be used to reduce runoff and
<br />increase the water intake rate of the soil. 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 and
<br />the hazard of erosion. Fallowing in summer, cultivating
<br />for weed control, and selecting adapted plants help to
<br />insure establishment and survival of seedlings. Planting
<br />on the contour helps to preserve moisture. Supplemental
<br />irrigation may be needed when planting and during dry
<br />periods. Among the trees that are suitable for planting
<br />are Rocky Mountain juniper, eastern redcedar,
<br />ponderosa pine, Siberian elm, Russian-olive, and
<br />hackberry. Among the shrubs are skunkbush sumac,
<br />lilac, Siberian peashrub, and American plum.
<br />If this unit is used for homesite development, the main
<br />limitations are steepness of slope and the hazard of
<br />erosion. Excavating for roads and buildings increases the
<br />risk of erosion. Revegetating disturbed areas around
<br />construction sites as soon as feasible helps to control
<br />soil blowing.
<br />Slope is a concern in installing septic tank absorption
<br />fields- Absorption lines should be installed on the
<br />contour. The effects of shrinking and swelling can be
<br />minimized by using material that has low shrink-swell
<br />potential.
<br />This map unit is in capability subclass Vie, irrigated
<br />and nonirrigated. It is in the Loamy Plains range site.
<br />l 68-Table Mountain loam. This deep, well drained
<br />soil is on ood plains of intermittent streams. It formed in
<br />alluvium. Slope is 0 to 2 percent. Areas are elongated
<br />and are 20 to 400 acres.
<br />Typically, the surface layer is brown loam 4 inches
<br />thick. The upper part of the subsoil is grayish brown
<br />loam 18 inches thick, the next layer is pale brown loam
<br />12 inches thick, and the lower part to a depth of 60
<br />inches or more is very pale brown, limy loam. In some
<br />places, the lower part of the subsoil has strata of
<br />gravelly sandy loam or silty clay loam. In some areas of
<br />ar ' eluded soils, the surface layer is clay I
<br />Included in this unit are small areas of Bankard sandy
<br />oam son loam and Ply Inam_ nc u e
<br />areas make u about 15 percent of th total acres
<br />ermea ity of this Table Mountain sail is moderate.
<br />Available water capacity is high. Effective rooting depth
<br />is 60 inches or more. Runoff is slow, and the hazard of
<br />water erosion is moderate. The hazard of soil blowing is
<br />moderate. This soil is subject to rare periods of very brie
<br />flooding in spring and early in summer.
<br />This unit is used for noninigated crops and as
<br />rangeland. A few areas are used for irrigated crops.
<br />This unit is well suited to nonirrigated crops. It is
<br />limited mainly by low precipitation, the hazard of sail
<br />blowing, and the hazard of flooding. Because
<br />precipitation is not sufficient for annual propping, a
<br />cropping system that includes planting small grain and
<br />fallowing in summer is most suitable. Soil blowing is
<br />reduced by returning crop residue to the soil and
<br />practicing minimum tillage- Leaving crop residue on or
|