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36 <br />This unit is suited to homesite development. Shrink- <br />sv:ell potential can be minimized by thoroughly <br />prewetting foundation areas. Restrictive permeability for <br />septic tank absorption fields can be overcome by <br />increasing the size of the absorption field. Revegetating <br />disturbed areas around construction sites as soon as <br />possible helps to control soil blov;ing. <br />This map unit is in capability subclass IVe, <br />nonirrigated. It is in Loamy Foothills range site. <br />41-Manvel silty clay loam, saline, 1 to 5 percent <br />slopes. This deep, well drained soil is on toot slopes, <br />mainly along upland drainageways (fig. 4). I! formed in <br />colluvium derived dominantly from limestone and shale. <br />The native vegetation is mainly grass. Elevation is 5,500 <br />l0 6,600 feet. The average annual precipitation is 12 to <br />15 inches, the average annual air temperature is 50 to <br />54 degrees F, and the average frost-tree period is 125 to <br />160 days. <br />Typically, the surface layer is brown silty clay loam <br />about 3 inches thick. Below this to a depth of 60 inches <br />or more is silty clay loam. Shale underlies much of the <br />area between depths of 5 and 12 feet. Water perched on <br />the shale creates moist and strongly saline spots. The <br />soil is moderately alkaline to a depth of 14 inches and <br />Soil survey <br />strongly alkaline below that depth. It is moderately saline <br />below a depth of 3 inches. <br />Included in this unit is about 15 percent Otero sandy <br />Loam on low hummocks and ridges. Also included are <br />small areas of Limon silty clay loam and Apishapa silty <br />clay along drainageways. <br />Permeability of this Manvel soil is moderately slow. <br />The available water capacity is limited by salinity. <br />Effective rooting depth is 60 inches or more. Runoff is <br />medium, and the hazard of water erosion is high. <br />This unit is used as rangeland. <br />The potential plant community on this unit is mainly <br />alkali sacaton and blue grams. Other plants that <br />characterize the unit are western wheatgrass and <br />fourwing saltbush. The average annual production of air- <br />dry vegetation is about 1,200 pounds per acre. If the <br />condition of the range deteriorates, greasewood and <br />inland saltgrass increase. The main limitations for <br />seeding are salinity and gullies. <br />II this unit is used for windbreaks and environmental <br />plantings, the main limitation is salinity. Only trees and <br />shrubs that tolerate salinity should be planted. <br />If this unit is used for homesite development, <br />corrosivity to concrete and steel is the main limitation. <br />Shrink-swell potential can be minimized by thoroughly <br />prewetting foundation areas. Restrictive permeability for <br /> <br />...'• _;. <br />Figure 4.-Area o/ Manve! s%17y clay loam, sa/one. 1 ro 5 percent slopes. <br />