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' 60 inches or more. Organic matter content of the surface layer is low. Surface runoff is medium, and the erosion hazazd is moderate. ' The native vegetation on this soil is mainly saltgrass, alkali sacaton and greasewood. The soil is conducive to wildlife habitat, limited grazing and some irrigated farming. ' This soil is in capability subclass Vlls, imgated and nonirrigated. Soils Map Unit 27: The southwest corner is considered Halaquepts, nearly level. The upper 24 inches generally ranges from loam to clay with the underlying layers mostly gravelly. The soil is commonly gleyed from the surface down. Stratified sand, gravel and cobble are at a depth of 24 to 40 inches. In some areas the gravel and cobbles are at or near the surface. The soil was ' formed alluvium, is somewhat poorly drained and salt-affected. The water table is at or near the surface at times being strongly affected by seasonal water levels and irrigation. ' The native vegetation consists of tamarisks, willows, cottonwoods and alkali and water-tolerant grasses. This unit is used mainly for grazing. Some hay may be grown in areas drained by ditches but yield is usually poor because of saline condition. Better success is produced using alkali-tolerant grasses and legumes. These soils are in capability subclass Vlw, nonirrigated. Soils Map Unit 34: Adjacent to the southern boundary of [-70 and traveling eastward to Mamm I Creek the soil found is considered lldefonso stony loam, 25 to 4~ percentslopes. This is hilly to steep soil, deep and well drained on mesa breaks, alluvial fans and sides of valleys. The soil is formed in mixed alluvium derived primarily from basalt. This soil has a thin intermittent cap of I reddish eolian material. Typically, the surface layer is brown stony loam about 8 inches thick with an underlying material of white, very strongly calcareous very stony loam to a depth of 60 inches. ~ Permeability is moderately rapid and available water capacity is low. Rooting depth is more than 60 inches. Surface runoff is medium, and the erosion hazard is severe. The vegetation on this soil includes Wheatgrass, junegrass and sagebrush. J This soil is incapability subclass Vlle, non irrigated. Soils Map Unit 54: Adjacent to and on a bench continuing south of Soils Unit 34 can be found Potts loam. 1 to 3 percent slopes. This is deep, well drained soil on mesas and benches. It is formed in alluvium derived from sandstone, shale or basalt. Typically, the surface layer is brown loam about 4 inches thick. The subsoil is reddish brown clay loam about 24 inches thick. The substratum is pinkish white loam to a depth of 60 inches. Permeability is moderate and available water capacity is high. Effective rooting depth is 60 or more inches. Surface runoff is slow and the erosion hazard is slight.