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Revised 6-16-81 <br />CRYORTHENTS, STEEP SERIES (map symbol: X-60) (26% of property) <br />The Cryorthents, Steep series consists of moderately fine <br />textured shaly clay loam to clay loam, generally very shallow <br />(less than 10 inches) and develops on sandstone or shale uplands. <br />These soils have a low available water holding capacity of approximately <br />1.5 inches with the rooting depth. The soil is low in organic matter <br />and has a severe erosion hazard. It is on unfavorable exposures and <br />much of the moisture is removed by high winds. Slopes range from <br />10 to 65 percent. The soil from Backhoe Trench 13 and the soils <br />from Auger Hole 22, whose analyses are shown in Table 9, are typical <br />of the Cryorthents series of soils on the Bourg property. These <br />soils sustain a very low amount of vegetation and would be of little <br />use in reclamation. <br />Capability units are VIIs-2 for nonirrigated. <br />COALMONT SERIES (map symbol: X73-AE) (1% of property) <br />The Coalmont series consits of moderately deep, well-drained <br />soils formed in material weathered from Coalmont shale. They occupy <br />upland hills and ridges at elevations of 8,000 to 8,300 feet, and <br />are underlain by soft shale at depths of 20 to 40 inches. Slopes <br />are 5 to 12 percent. The native vegetation is mainly alkali sage- <br />. brush, streambank wheatgrass, pine needlegrass, mutton grass, winterfat, <br />Junegrass, squi~eltail and low rabbitbrush. The mean annual <br />precipitation is 10 to 12 inches. The mean annual air temperature is <br />37 to 38 degrees F. and the frost-free season is 35-45 days. <br />In a representative profile the surface layer is light grayish <br />brown loam about 4 inches thick. The subsoil is grayish brown and <br />light brownish gray clay about 16 inches thick. The underlying material <br />is light yellowish brown clay loam over calcareous clay shale at a <br />depth of about 30 inches. <br />Permeability is slow and the available water capacity is approx- <br />imately 4.5 inches within the rooting depth. The heavy texture tends <br />to slow water loss by evaporation and runoff. <br />These soils are mainly used for grazing. Some areas are used <br />for irrigated hayland and pasture. In the Bourg property there is <br />of course no irrigated hayland or pasture. <br />RECEIVED <br />• .fUL 9 1981 <br />MINED LAND RECLAMATION-COAI <br />M-5 COLO. DE71. OF NATURAL RE50'~RCES <br />