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Mountain Coal Company Exhibit 27 <br />West Elk Mine Characteristics of West Elk Mine Soil Mapping Units <br />Classitcation of Maior Components -The components listed below comprise the major <br />part of the maoping unit: <br />A. Argic Cryoborolls (Chernozem). <br />1. Fine-loamy. mixed family. <br />(Kimmons Series) <br />(Inchauspie Series) <br />(Gelkie Ser.es) <br />B. Argic Pachic Cryoborolls (Chernozem). <br />1. Fine-loamy, mixed family. <br />(Bachus Series) <br />(Bondurant Series) <br />Extent and Major Areas of Occurrence - Mapping unit number X30 has a large total <br />acreage and occurs throughout the mine area at elevations greater than 7,800 feet. <br />Largest areas occur in the southern, central, and eastern parts of the mine area. <br />• Characteristic To~P_raohv -These soils are considered the norma] soils of the colder <br />parts of the mine area and occur on moderately to steeply sloping hill and valley <br />topography. Typically they occupy side hill locations, but unless bedrock is close to the <br />surface, they occur on hill and ridge crests as well. <br />Slopes range from about 3 to 60 percent. <br />Physical Properties -The soils of mapping unit number X30 have for the most part the <br />same physical properties of the soils in mapping unit number 30. <br />Chemical Properties and Natural Fertility -The soils of mapping unit number X30 have <br />for the most part the same natural fertility as the soils in mapping unit number 30, but <br />the chemical analyses differ. <br />Mappine Unit Number 3l - Moderately deep (20 to 40 inches to bedrock) and deep <br />(more than 40 inches to bedrock), dark colored, well drained, tine textured (more than <br />35 percent clay), maturely developed soils having an A1, B2t, C horizon sequence with <br />well developed horizons of silicate clay accumulation (B2t horizon), occurring in parts <br />of the mine area where the mean summer soil temperature (June. July, and August mean <br />temperature measured at 20 inches) is 59°F or warmer. <br />Classification of Major Components -The components listed below comprise the major <br />• part of the mapping unit: <br />Exhibit 27-24 <br />