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Mountain Coal Company Exhibit 27 <br />• West Elk Mine Characteristics of West Elk Mine Soil Mapping Units <br />Mappino Unit Numbzr 30 - Moderately deep (~0 to 40 inches to bedrock) and deep <br />(more than 40 inches to bedrock), dark colored. well drainzd, medium to moderately tine <br />textured (18 to 3~ percent clayl, maturely developed soils having an Al. B2t. and C soil <br />horizon sequence with well-developed horizons of silicate clay accumulation (B2t <br />horizons) occurring in parts of the study area where the mean summer soil temperature <br />(June, Juiy, and August mean temperature measured at 20 inches) is 59°F or warmer. <br />Classification of Ntajor ComQonents -The components listed below comprise the major <br />part of the mapping unit: <br />A. Aridic .4rgtustolls (Chesnut Soils). <br />1. Fine-loamy. mixed, mesic family. <br />(Carnero Series) <br />(Satanka Series) <br />(Hargreave Series) <br />(Ascalon Series) <br />B. Pachic Argiustolls (Chesnut Soils). <br />• 1. Fine-loamy, mixed, mesic. <br />(Sampson Series) <br />(Jarita Series) <br />C. Aridic Argiborolls (Chernozems). <br />1. Fine-loamy, mixed. <br />(Assiniboine Series) <br />(Bostwick Series) <br />(Duffson Series) <br />D. Pachic Argiboroll (Chernozems) <br />1. Fine-loamy, mixed. <br />(Agner Series) <br />(Hesperus Series) <br />Extent and Major Areas of Occurrence -These may be considered the normal soils of <br />the warmer part of the mine area and occur on moderately to steeply sloping hill and <br />valley topography. Typically they occur on side hill locations but unless bedrock occurs <br />close to the surface they occur on hill and ridge crests as well. Slopes range from about <br />3 to 60 percent. <br />Physical Pro~rties - The soils of mapping unit number 30 are mature soils with distinct <br />• genetic soil horizonation and well developed, stable soil structure. This natural structure <br />is essential to free movement of air, water, and plant roots through the soil. The natural <br />structure must be preserved for use in the development of seedbeds. <br />Exhibit 27-22 <br />