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AT(05-1)ML-60.8-C-SR-11 • EXHIBIT I SOILS 37 - Pinon/Bowdish/Progresso Loams, 1% to 12% Slopes This map unit is on mesa tops and ridges. The native vegetation is mainly pinyon pine, Utah juniper, grasses and shrubs. Elevation is 6,800 to 7,400 ft. The average annual precipitation is 13 to 15 inches, the average annual air temperature is 45'-470F, and the average frost- free period is 90-120 days. This unit is 35% Pinon loam, 30% Bowdish loam, and 20% Progresso • loam. The Pinon and Bowdish soils are under pinyon-juniper, and the Progresso soil is under grasses and sagebrush. The components of this unit are so intricately intermingled that it was not practical to map them separately at the scale used. Included in this unit is about 10% rock outcrop, and 5% soils that are similar to this Pinon soil but have greater than 35% rock fragments in the control section. Also included are small areas of Monogram soils. The Pinon soil is shallow and well-drained. It formed in residuum derived dominantly from interbedded sandstone and shale. Typically, the surface layer is brown loam five inches thick. The underlying material is pinkish white loam to a depth of sixteen inches. Hard sand- stone is at a depth of sixteen inches. In some areas, the surface layer • is gravelly loam. -15-