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Where this soil is on flood plains and is susceptible to flooding it has poor potential for <br />urban and recreational development. On the higher terraces the potential is fair. Dwelling <br />and road designs need to be modified to increase the capacity of the soil to support a load <br />and to protect it against frost action. Capability subclass IIw irrigated. <br />21-Dacono Clay Loam, 0-1 % slopes <br />This is a deep, well drained soil on terraces at elevations of 4550 to 4970 feet. [t formed in <br />mixed alluvium. Included in mapping are small, long and narrow areas of sand and gravel <br />deposits and some small, leveled areas. Typically, the surface layer of this Dacono soil is <br />grayish brown clay loam about 12 inches thick. The subsoil is grayish brown clay loam <br />about 15 inches thick. The substratum is very gravelly sand. <br />Permeability is moderately slow. Available water capacity is moderate. The effective <br />rooting depth is 20 to 40 inches. Surface mnoff is slow, and the erosion hazard is low. <br />This soil is used almost entirely for irrigated crops. It is suited to all crops commonly <br />grown in the area, including com, sugar beets, beans, alfalfa, small grain, potatoes, and <br />onions. An example of a suitable cropping system is 3 to 4 years of alfalfa followed by <br />corn, corn for silage, sugar beets, smal- grain, or beans. Generally, such characteristics as <br />high clay content or a rapidly permeable substratum slightly restrict some crops. <br />All methods of irrigation are suitable, but furrow irrigation is the most common. Proper <br />irrigation water management is essential. Barnyard manure and commercial fertilizer are <br />needed for top yields. <br />Windbreaks and environmental plantings of trees and shrubs commonly grown in the area <br />are generally well suited to this soil. Cultivation to control competing vegetation should be <br />continued for as many years as possible following planting. Trees that are best suited and <br />have good survival are Rocky Mountain juniper, eastern redcedar, ponderosa pine, Siberian <br />elm, Russian-olive, and hackberry. The shrubs best suited are skunkbush sumac, lilac, <br />Siberian peashmb, and American plum. <br />Openland wildlife, such as pheasant, mourning dove, and cottontail are best suited to this <br />soil. Wildlife habitat development, including tree and shrub plantings and grass plantings to <br />serve as nesting areas, should be successful without irrigation during most years. Under <br />irrigation, good wildlife habitat can be established, benefiting many kinds of openland <br />wildlife. <br />This soil has only fair potential for urban and recreational development. Above the sand <br />and gravel substratum the soil has moderate slow permeability. These features create <br />problems in dwelling and road construction. Excessive permeability in the substratum can <br />cause contamination of the ground water supply from septic tank leach fields. Sewage <br />lagoons need to be lined. Capability subclass Its irrigated. <br />31 -Kim Loam, 0-1 % slopes <br />This is a deep, well drained soil on smooth plains and alluvial fans at elevations of 4900 to <br />5250 feet. It formed in mixed eolian deposits and parent sediment from a wide variety of <br />Ft Lupton Pit <br />DMG 1 !2 Permit <br />Page 41 of 81 <br />