2018-03-30_PERMIT FILE - C1981038 (4)

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§2.04 APPLICATION FOR PERMIT FOR SURFACE OR UNDERGROUND MINING ACTIVITIES --MINIMUM REQUIREMENTS FOR INFORMATION ON ENVIRONMENTAL RESOURCES. 3-Agua Fria stony loam, 3 to 12 percent slopes. This is a deep, well drained soil. It formed in cobbly and stony outwash alluvium derived from basalt and is on old terraces, mesas, and fans. Elevation ranges from 5,800 to 7,000 feet. Average annual precipitation is about 13 inches, average annual air temperature is about 47 degrees F, and the average frost-free season is about 115 days. Typically the surface layer is brown stony loam about 2 inches thick. The subsoil is reddish brown or light brown stony clay loam about 22 inches thick. The upper part of the substratum is pink cobbly loam about 10 inches thick. The lower part, to a depth of 60 inches, is pink very cobbly loam. Permeability is moderately slow, and available water capacity is high. Effective rooting depth is 60 inches or more. Surtace runoff is medium. The hazard of erosion from wind is slight and from water is moderate. Included with this soil in mapping are a few small areas of Saraton, Mesa, Avalon, Cerro, and Delson soils. In some places the surface layer is free of stones or is stony clay loam. In some small areas marl is at a depth of less than 40 inches. Some areas have less clay in the subsoil. In some areas the surface layer is very stony. The native vegetation on this soil consists mainly of big sagebrush, pinyon, and juniper (fig. 2). Western wheatgrass, Indian ricegrass, needleandthread, and Junegrass are common grasses. About half of the acreage of this soil is used for grazing of livestock and wildlife and for recreational purposes. Some areas are in noncommercial forest and are used for limited grazing of livestock and wildlife and for recreational purposes. A small acreage is irrigated and is used for pasture, hay, and orchard crops. This soil is suited to all of the crops commonly grown in the survey area. Shortness of the growing season may limit the choice of crops. Because of stoniness, Surtace clearing or rock picking may be required so that the soil can be tilled. Moisture intake rate of the surface layer is moderate and moderately slow, and the soil is easy to work if stones and cobbles are removed. This soil can be kept in continuous row crops if crop residue is used to maintain an adequate content of organic matter. Good management of irrigation water and land leveling help to conserve irrigation water and to control erosion. Minimum tillage and use of cover crops and green manure crops also help to maintain organic matter content and to control erosion. This soil can be used for irrigated pasture and hay crops. It is well suited to smooth brome, orchardgrass, intermediate wheatgrass, alfalfa, and clover. Rock picking may be required before a suitable irrigation system can be installed. Irrigation can be done by contour ditch, corrugation, and furrow methods. Because annual precipitation is low and has poor seasonal distribution, this soil is not suited to nonirrigated crops. Stones and cobbles on the surface interfere with cultivation. Nonirrigated pasture grasses can be planted late in summer and in fall to protect the soil from erosion and to provide limited grazing for livestock, if good pasture management is practiced. Crested wheatgrass, Russian wildrye, and pubescent wheatgrass are adapted species. Seeding of pasture may be impractical, however, because of TR-20 2.04 - 20 3/01