2008-09-12_PERMIT FILE - M2008060

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0611412008 15:01 19703456610 Washington County, Colorado WASHINGTON COUNTY sandstone. Slope is 0 to 5 percent. The surface layer is grayish brown loamy sand about 5 inches thick. The upper 5 inches of the subsoil is grayish brown sandy clay loam, and the lower 6 inches is brown sandy clay loam. Sandstone is at a depth of about 16 inches. Depth to sandstone ranges from 8 to 20 inches. In some areas of similar included soils, the surface layer is channery loamy sand or the soil is slightly more than 20 inches deep to bedrock. Permeability of the Bernal soil is moderate. Available water capacity is very low. Effective rooting depth is 8 to 20 inches. Runoff is medium, and the hazard of water erosion is moderate. The hazard of soil blowing is severe. Rock outcrop consists of areas that are at least 90 percent barren rock ledges and escarpments. The Julesburg soil is deep and well drained. It formed in colluvium and eolian sand. Slope is 3 to 9 percent. Typically, the surface layer is grayish brown loamy sand about 10 inches thick. The upper 8 inches of the subsoil is brown sandy loam, and the lower 12 inches is yellowish brown loamy sand. The substratum to a depth of 6C inches or more is pale brown sand. Permeability of this Julesburg soil is moderately rapid. Available water capacity is moderate. Effective rooting depth is 60 inches or more. Runoff is medium, and the hazard of water erosion is moderate. The hazard of soil blowing is severe. This unit is used for grazing. The potential plant community on the Bernal soil is mainly sideoats grama, little bluestem, needleandthread, big bluestem, and sand bluestem. This unit is poorly suited to windbreaks and environmental plantings. The main limitations are the shallowness and very low available water capacity of the Bernal soil. Onsite investigation is needed to determine the feasibility of planting trees and shrubs. If this unit is used for homesite development, the main limitations are the shallowness of the Bernal soil and the hazard of soil blowing. Cuts needed to provide essentially level building sites can expose bedrock. Excavating increases the risk of erosion. This map unit is in capability subclass Vlls. The Bernal soil is in the Sandstone Breaks range site. The Julesburg soil is in the Sandy Plains range site. 11-Brldgeport silt loa This deep, well drained soil is o 0o p a :g. . formed in calcareous, silty alluvium. Slope is 0 to 2 percent Areas are elongated and are 10 to 300 acres. Typically, the surface layer is very dark grayish brown silt loam 10 inches thick., The upper part of the subsoil is dark grayish brown silty clay loam 8 inches thick, the next 8 inches is pale brown silty clay loam, and the lower part to a depth of 60 inches or more is yellowish brown silty clay loam. PAGE 03 ii Included in this unit are small areas of Table Mountain loam. Included areas make up about 10 percent of the total acreage. Permeability of this Bridgeport soil is moderate. Available water capacity is high. Effective rooting depth is 60 inches or more. Runoff is medium, and the hazard of water erosion is moderate. The hazard of soil blowing is moderate. This soil is subject to rare, very brief periods of flooding in spring and summer. Most areas of this unit are used for grazing. A few areas are used for nonin igated crops. If this unit is used for nonirrigated crops, the main limitations are the hazards of flooding and soil blowing and low precipitation. Because precipitation is not sufficient for annual cropping, a cropping system that includes planting small grain and fallowing in summer is most suitable. Most climatically adapted crops can be grown if the soil is protected from flooding late in spring and early in summer and K artificial drainage is provided. Proper row arrangement, field ditches, and vegetated outlets are needed to remove excess water. Maintaining crop residue on or near the surface reduces runoff and soil blowing and helps to maintain soil tilth and the organic matter content. Tillage should be kept to a minimum. Furrow, border, corrugation, and sprinkler irrigation systems are suited to the soil in this unit. Water should be applied at a rate that insures optimum production without increasing deep percolation, runoff, and erosion. Applying nitrogen and phosphorus increases production. If this unit is used for hay and pasture, the main limitations are low precipitation and the hazard of flooding. Diversions and grassed waterways are necessary in some places. Proper grazing practices, weed control, and fertilizer help to insure maximum forage quality. The potential plant community on this unit is mainly western wheatgrass, blue grama, green needlegrass, anc switchgrass. Mechanical treatment practices such as pitting and contour furrowing can be used to reduce runoff and increase the water intake rate of the soil. Seeding is suited to this unit. This unit is well suited to windbreaks and environmental plantings. It has few limitations. Fallowing in summer, cultivating for weed control, and selecting adapted plants are necessary to insure the establishment and survival of seedlings. If necessary, supplemental irrigation should be provided when plantinc and during dry periods. Suitable trees for planting are Rocky Mountain juniper, eastern redcedar, ponderosa pine, Russian-olive, and hackberry. Suitable shrubs are skunkbush sumac, lilac, Siberian peashrub, and American plum. If this unit is used for homesite development, the main limitations are the hazard of flooding and low soil strength. Frost action potential limits the construction