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• Exhibit I <br /> <br />The Cascajo soil is deep and excessively drained. It forned in gravelly and sandy alluvium. Slopes <br />range from 10 to 40 percent. The surtace layer is typically very dark grayish vrown very gravelly sandy <br />loam about 6 inches thick. The upper 15 inches of the underlying material is extremely cobbly sandy <br />loam. The lower part to a depth of 60 inches or more is extremely cobbly sand. The soil is moderately <br />alkaline. A high wntent of accumulated calcium carbonate is between depths of 6 and 21 inches. <br />The unit is used as rangeland. The potential plant community is mainly sideoats grama, blue grama, <br />needleandthread, Indian ricegrass, and little bluestem. The average annual production is about 800 <br />pounds per acre. If the condition of the range deteriorates, red threeawn and annual (orbs increase. The <br />capability classification is VII-e, nonirrigated. The unit is in the Gravel Breaks #64 range site. <br />Unit 92 <br />Name Riverwash <br />Description <br />This map unit consists of alluvial sand, gravel and cobbles, with some very small areas of included soils <br />on flood plains. It is almost entirely barren, but a few willow trees grow on bars. Scattered cottonwood <br />and willow trees and other plants grow in small areas of included soils on flood plains. Scrubby pinyon <br />and juniper are common on adjacent terrace edges in the foothills. <br />Included in mapping are small areas of deep, poorly drained or somewhat poorly drained soils on flood <br />plains. Also included are small areas of Bronell soils on short, steep terrace edges and some areas of <br />igneous and sedimentary bedrock outcrop on stony and cobbly terrace edges. (These do not appear to <br />be present on this site.) Riverwash typically consists of alluvial sand, gravel, and cobbles. It is subject <br />to scouring and receives fresh deposits of alluvium from floodwater. The capability classification is VIII- <br />w. <br />Unit 105 <br />Name Shanta loam, dry, 0-3% slope <br />Description <br />This deep, well drained soil is on stream terraces. It formed in alluvium. The native vegetation is mainly <br />grasses. Fine-loamy, mixed mesic Cumulic Haplustolls: non-hydric. <br />The surtace layer is typically grayish brown loam about 27 inches thick. The substratum to a depth of 60 <br />inches or more is stratified sandy clay loam, loam, and silty clay loam. The soil is mildly alkaline to a <br />depth of 50 inches and is moderately alkaline below that depth. <br />Included with this soil in mapping of this unit are areas of poorly drained soils adjacent to stream <br />channels. These soils have a surtace layer of fine sandy loam. They make up about 10 percent of the <br />unit. Also included are areas of well drained soils that generally have sandy loam in the upper 40 inches. <br />These soils make up about 5 percent of the unit. <br />Permeability is moderate in the Shanta soil. Available water capacity is high. Effective rooting depth is <br />60 inches or more. Runoff is slow and the hazard of water erosion is slight. The soil is generally subject <br />to rare, very brief periods of flooding from April through September. <br />The potential plant community is mainly blue grama, western wheatgrass, little bluestem, and Indian <br />ricegrass. The average annual production of air-dry vegetation is about 1,400 pounds per acre. <br />The capacity classification is II-e, irrigated, and VI-c, nonirrigated. The soil is in the Overtlow #36 range <br />Trans-Colorado Concrete October 99 <br />Application for Permit: Spotted Burro Pit Page 27 <br />