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This soil is not suited to urban or recreational development because of the flood hazard. Capability <br />subclass IVw irrigated, VIw nonirrigated; Sandy Bottom land range site. <br />Colombo clay loam, 0 to I percent slopes <br />This is a deep, well drained soil on flood plans and terraces at elevations of 4,600 to 4,780 feet. It <br />formed in stratified calcareous alluvium. Included in mapping are small areas of soils that have a <br />loam surface layer and some small leveled areas. <br />Typically the surface layer of this Colombo soil is dark grayish brown clay loam about 14 inches <br />thick. The upper 7 inches of the underlying material is pale brown stratified clay loam and loam. <br />The lower part to a depth of 60 inches is very pale brown loam stratified with thin lenses of fine <br />sand, medium sand, and clay loam. <br />Permeability is moderate. Available water capacity is high. The effective rooting depth is 60 <br />inches or more. Surface runoff is slow, and the erosion hazard is low. <br />In irrigated areas this soil is suited to crops commonly grown in the area, such as corn, sugar beets, <br />beans, alfalfa, onions, and potatoes. <br />All methods of irrigation that are common to the area are used. Borders are suitable for small grain, <br />alfalfa, and pasture. Furrow irrigation is used for row crops. Crops respond to application of <br />nitrogen and phosphorus. <br />Windbreaks and environmental plantings of trees and shrubs commonly grown in the area are <br />generally well suited in this soil. Cultivation to control competing vegetation should be continued <br />for as many years as possible following planting. Trees that are best suited and have good survival <br />are Rocky Mountain juniper, eastern redcedar, ponderosa pine, Siberian elm, Russian-olive, and <br />hackberry. The shrubs best suited are skunkbush sumac, lilac, Siberian peashrub, and American <br />plum. <br />Wildlife is an important secondary use of this soil. Ring-necked pheasant, mourning doves, and <br />many nongame species can be attracted to establishing areas for nesting and escape cover. For <br />pheasants, undisturbed nesting cover is essential and should be included in plans for habitat <br />development, especially in areas of intensive agriculture. <br />Where the soil is on flood plains and is susceptible to flooding it has poor potential for urban and <br />recreational development. On the higher terraces the potential is fair. Dwelling and road designs <br />need to be modified to increase the capacity of the soil to support a load and to protect it against <br />frost action. Capability subclass IIw irrigated. <br />Parsons Mine <br />DRMS 112 Reclamation Permit Application <br />Page 13 of H O