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• • <br /> Permeability of this Rentsac soil is moderately rapid. Available water capacity is very low. Effective <br /> rooting depth is 10 to 20 inches (depth to bedrock). Runoff is rapid, and the hazard of water <br /> erosion is moderate to very high. <br /> 1-5 SOIL MAPPING UNIT 75— RENTSAC-PICEANCE COMPLEX <br /> The unit is 60 percent Rentsac channery loam that has slopes of 8 to 30 percent and 20 percent <br /> Piceance fine sandy loam that has slopes of 2 to 15 percent. The Piceance soil is generally on <br /> north-facing side slopes and is in more concave areas than the Rentsac soil. This map unit is on <br /> uplands, broad ridges, and foothills. The native vegetation is mainly sparse stands of pinyon and <br /> juniper, and open areas of sagebrush. <br /> The Rentsac soil is shallow and well drained. It formed in residuum derived dominantly from <br /> sandstone. Typically, the surface layer is grayish brown channery loam about 5 inches thick. The <br /> next layer is brown, strongly calcareous very channery loam about 4 inches thick. The underlying <br /> material is very pale brown extremely flaggy light loam 7 inches thick. Depth to sandstone ranges <br /> from 10 to 20 inches. Permeability of the Rentsac soil is moderately rapid. Available water <br /> capacity is very low. Effective rooting depth is 10 to 20 inches. Runoff is medium, and the hazard <br /> of water erosion is moderate to high. <br /> The Piceance soil is moderately deep and well drained. It formed in eolian material and colluvium <br /> derived dominantly from sandstone. Typically, the surface layer is brown fine sandy loam 4 inches <br /> thick. The upper 5 inches of the subsoil is brown loam, and the lower 13 inches is light yellowish <br /> brown loam. The substratum is very pale brown channery light loam 8 inches thick. Depth to <br /> sandstone ranges from 20 to 40 inches. Permeability of the Piceance soil is moderate. Available <br /> water capacity is low. Effective rooting depth is 20 to 40 inches. Runoff is slow to medium, and the <br /> hazard of water erosion is slight to moderate. <br /> 1-6 SOIL MAPPING UNIT 91 —TORRIORTHENTS-ROCK OUTCROP COMPLEX <br /> This map unit is in extremely rough and eroded areas on mountains, hills, ridges, and canyonsides. <br /> Slopes face mainly south. The native vegetation is mainly sparse shrubs and grasses with some <br /> pinyon and juniper trees. The unit is 50 percent Torriorthents that have slopes of 15 to 65 percent <br /> and 30 percent rock outcrop that has slopes of 35 to 90 percent. <br /> Torriorthents are very shallow to moderately deep, and they are well drained and somewhat <br /> excessively drained. They formed in residuum and colluvium derived dominantly from sandstone, <br /> shale, limestone, and siltstone. Torriorthents are highly variable. No single profile of Torriorthents <br /> G:\LM\M78545.002\Reclamation\Redamexh.DOC 1-6 <br />