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§2.04 APPLICATION FOR PERMIT FOR SURFACE OR UNDERGROUND MINING <br />ACTIVITIES --MINIMUM REQUIREMENTS FOR INFORMATION ON <br />ENVIRONMENTAL RESOURCES. <br />surface stoniness. <br />The potential plant community in the understory consists mainly of bluebunch wheatgrass, western wheat- <br />grass, needleandthread, Indian ricegrass, muttongrass, squirreltail, and galleta. As site conditions <br />deteriorate, these grasses decrease, fortis and woody shrubs increase, and undesirable weeds and <br />annual plants invade and become more abundant. <br />Seeding is advisable in areas that are in poor condition or have been denuded by fires, if the soil is not too <br />stony. Western wheatgrass, bluebunch wheatgrass, Indian ricegrass, and needleandthread are suitable <br />for seeding. Grasses that meet the seasonal requirements of livestock should be selected. Preparing a <br />seedbed and driling the seed where possible help to obtain the best results. Seeded areas should be <br />fenced. <br />This soil is suited to Utah juniper and pinyon pine. It can produce 13 cords per acre in a stand in which <br />tree trunks have an average diameter of 5 inches at a height of one foot. The primary limitation to its use <br />for wood crops is surface stoniness, which can hinder equipment operations. <br />This soil is used for winter range by mule deer. Big sagebrush, mountainmahogany, and bitterbrush are <br />important browse species which can be managed for optimum production. In wooded areas this soil has <br />some potential for habitat for blue grouse and band-tailed pigeon. <br />This soil is suited to most of the orchard crops grown in the survey area. The principal orchard crops <br />grown on this soil are apples, peaches, cherries, and pears. Surtace stoniness hinders the operation of <br />farm machinery. Rock picking is a common practice. Frost early in spring can severely damage these <br />crops. Cover crops are necessary to control erosion but should be managed so that they do not compete <br />with fruit trees. Application of fertilizer promotes the best growth of trees and the production of high quality <br />fruit. Fertilizer requirements should be based on soil or foliage analysis. An intensive spray program is <br />generally needed to control insects and disease. <br />If this soil is used for urban development, the main limitations are stoniness and shrink-swell potential. If it <br />is used for septic tank absorption fields, permeability is also a limitation. The limitations can be overcome <br />by the use of proper design and construction methods. <br />This soil is in capability subclasses IVs, irrigated, and Vls, nonirrigated. <br />27-Colona silty clay loam, 6 to 12 percent slopes. This is a deep, well drained soil. It formed in alluvium <br />and is on fans and terraces and in swales. Elevation ranges from 5,800 to 7,000 feet. Average annual <br />precipitation is about 12 inches, average annual air temperature is about 47 degrees F, and the average <br />frost-free season is about 130 days. <br />Typically the surface layer is light brownish gray silty clay loam about 3 inches thick. The subsoil is grayish <br />brown silty clay about 20 inches thick. The substratum, to a depth of 60 inches, is light gray silty clay. <br />TR-20 2.04 - 21 3/01 <br />