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1 <br />LJ <br />Mountain Coal Company Exhibit ~7 <br />West Elk Mine Characteristics of West Elk Mine Soil Mapping Units <br />E. Aridic Haploboroll (Chernozemic Regosol). <br />L Loamv. mixed. shallow. <br />(Series unknown) <br />F. Lithic Haploboroll (Chernozemic Lithosol). <br />1. Loamv-skeletal, mixed. <br />{Comodore Series) <br />_. Loamv. mixed. <br />(Corpening Series) <br />G. Lithic Argiborolls (Chernozem). <br />1. Loamv, mixed. <br />(Beenam Series) <br />• <br />H. Ustic Torriorthent (Regosols and Lithosols). <br />1. Loamy, mixed, (calcareous), mesic, shallow family. <br />(Tassel Series) <br />(Shingle Series) <br />2. Clayey, montmorillonitic, (calcareous), mesic, shallow family. <br />(Samsil Series) <br />3. Loamy, mixed, (calcareous), frigid, shallow family. <br />(Blazon Series) <br />(Shinbara Series) <br />4. Clayey, montmorillonitic, (calcareous), frigid, shallow family. <br />(Yawdim Series) <br />Extent and Moor Areas of Occurrence - Soils of mapping unit number 6 are <br />moderately extensive and occur throughout the survey area at elevations less than 7,800 <br />feet. They tend to replace soils of unit number 1 (previously described) in the soil <br />pattern as the soil environment becomes cooler and more moist. <br />Characteristic Toooeraohv - Mapping unit number 6 occurs on moderately to steeply <br />sloping ridge crests, shoulders, and along the edges of stream valleys where erosion has <br />been active, keeping the regolith thin. Slopes range from 5 percent to 50 percent or <br />more and soil bodies tend to be long and thin paralleling drainage channels. <br />C~ <br />J <br />Physical Properties - Ivfost of the soils of this unit are young soils and, with the <br />exception of the surface horizons, have only very weakly developed natural soil structure. <br />Consequently, the soils of this mapping unit are only moderately well adapted to <br />disturbance in the development of new seedbeds. Most of the soils of this unit are <br />subject to packing if traversed by heavy machinery. or to irreversible puddling if handled <br />when wet. The fine textured components (those with more than 35 percent clay) are <br />particularly susceptible to puddling. <br />Exhibit 27-8 <br />