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EXHIBIT D-Z Page 7 rira 1ar.drtctpe :s gently sloplry to steep lowez mountain slopes with inietvenigg canyons, a;ssas, and outaash fans. Vegetative cover intrudes grans, ponderosa pine, aervieeberry, oskbrush, aspen, end sagebrush. About 60 percent of `c',-.is unit has dark-colored surface layers to a depth of 8 to 2d inches. Organic matter content is high. Surface layers and subsoils are usuarlly medium to fine textures. Depth to underlying parent material, mainly~shele and sandstone, is 20 to 60 inches. The soils are nonralcareoua to depths of 10 to 30 inches. About 20 percent of the unit is :ass. than 20 inches deep over shale and sandsone. Surface layer thickness ranges from S to 10 inches. Textures vary according to parent material. F,nc::her 15 percent has dark-colored surface layers with a gray subsurface layer zanging from 2 to 12 inches in thickness. Depth to underlying material is 20 to 60 inches. These soils are neutral to slightly acid. ponderosa pine or oakbrush are usually dominant to these soils. The remaining S percent of the unit consists of mixed alluvial soil;;, some of which are poorly drained. Soil Mapping 'Jni~c 6: Light-colored soils of the cold mountain slopes There are several small delineations of this unit which is mostly within national forests. They are in the southeast part of the basin except for one chat foll.x+s i-?t~ di•siLe from nt~r Spruce Mountain to the upper reaches of Horsefly Creek. T:iis c~iit comprises only about {.5 percent of the basic but has ~ nigh water yield. The iaridscape is a stzong~y sloping to steep mountainous terrain dissected by numacous perennial mountain streams. A dense cover of spruce-fir (conifer), mainly Engelmann spruce, is dominant. Most of this unit has acid forest soils with a surface litter of needles and ~cwigs. About 58 percent of the soils have a dark-colored surface layer less than 4 inches thick. Below this is a light-rnlored, grey, subsurface layer ranging from 6 to 30 inches thick that is moderately coarse to coarse textured. The underlying subsoil has blocky structure. 4'axtare~ range from moderately fine to coarse. Some are gravelly or stony. Depth to underlying parent material is usually more than 70 inches. Another 20 percent of the unit is similar to the previous description except that the surface layers are dark-colored to depths of 8 to 20 inches. The gray subsurface layer ie 4 to 20 inches thick. About 20 percent of the unit has soils with bedrock at depths of 20 inches or less. The surface layer is dnrk-colored and about 7 inches thick. The gray subsurface layer ie usually absent. The remaining 2 per- cent ie composed of poorly drained alluvial soils along the drainageweys.