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is typical, but one commonly observed in the area has a surface layer of pale brown channery loam <br /> about 3 inches thick. The underlying material is very pale brown channery loam, very channery <br /> loam, or fine sandy loam about 13 inches thick. Shale or sandstone is at a depth of 16 inches. <br /> Torriorthents are calcareous throughout. Permeability is moderate, runoff is very rapid and <br /> available water capacity is very low. <br /> 1-7 SOIL MAPPING UNIT 104—YAMAC LOAM <br /> The Yamac soil type is deep (60 inches or more), well drained, and occurs on rolling uplands, <br /> terraces, and fans. The native vegetation is mainly low shrubs and grasses. Typically the surface <br /> layer is brown loam 4 inches thick. The upper 8 inches of the subsoil is brown loam, and the lower <br /> 10 inches is highly calcareous loam. Permeability of the Yamac soil is moderate. Available water <br /> capacity is moderate to high. Effective rooting depth is 60 inches or more. Runoff is medium, and <br /> the hazard of water erosion is slight to moderate. <br /> 1-8 SOIL MAPPING UNIT 6 — BARCUS CHANNERY LOAMY SAND <br /> The soil in this unit is located in a small valley in the extreme southwest portion of the Lease area <br /> and is not anticipated to be disturbed by the project. Therefore, this soil is not listed in Table 1-1 or <br /> 1-2. The Barcus soil is deep (60 inches or more), somewhat excessively drained, and occurs on <br /> alluvial fans and in narrow valleys. Typically, the surface layer is pale brown channery loamy sand <br /> 6 inches thick. The upper part of the underlying material is light yellowish brown channery sand 10 <br /> inches thick, and the lower part to a depth of 60 inches or more is stratified, light yellowish brown <br /> sand and loamy sand. The soil is calcareous throughout. Permeability of the Barcus soil is rapid. <br /> Available water capacity is low. Effective rooting depth is 60 inches or more. Runoff is slow, and <br /> the hazard of water erosion is moderate. <br /> 1-9 EFFECTS ON SOILS <br /> The Rock School Lease Project will have an effect on those soils which will be disturbed in <br /> developing and operating the project. The total acres of each of the soil mapping units to be <br /> disturbed by the project are shown in Table 1-1. The disturbance will involve removing, stockpiling, <br /> and replacing the upper portion of the soils. This upper portion will be salvaged for use in <br /> revegetating the disturbed areas as project activities are brought to a close. Some soils may be <br /> lost, or redistributed, during handling due to inherent inefficiencies of equipment capabilities and <br /> operation. <br /> G:\LM\M78545.002\Reclamation\Reciamexh.DOC 1-7 <br />