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U <br />Mountain Coal Company <br />West Elk Mine <br />Exhibit 27 <br />Characteristics of West Elk Mine Soil Mapping Units <br />D. .4rgic Lithic Crvoborolls. <br />1. Loamy. mixed. <br />(Gilispie Series) <br />Extent and Major Areas of Occurrence - Mapping unit number X6 occurs extensively <br />throughout most of the area at elevations above 7,800 reet. It is the cold counterpart of <br />mapping unit number 6 of lower elevations. <br />Characteristic Tooograohv - Topography for mapping unit number X6 is the same as <br />that of mapping unit number 6. <br />P~sical Properties - The soils of mapping unit number X6 have the same physical <br />properties as the soils in mapping unit number 6. <br />Chemical Properties and Natural Fertility -The soils of mapping unit number X6 have <br />the same chemical properties and natural fertility description as the soils in mapping unit <br />number 6; however, laboratory values vary slightly. <br />• Mapping Unit Number 16 - Moderately deep (20 to 40 inches to bedrock) and deep <br />(more than 40 inches to bedrock), light colored, medium to moderately fine textured (18 <br />to 35 percent clay), well developed soils having mature soil horizonation including <br />horizons of silicate clay accumulation (B2t horizons) and horizons of secondary carbonate <br />accumulation occurring in parts of the study area where the mean summer soil <br />temperature (June. July, and August mean temperature measured at 20 inches) is 59°F <br />or warmer. <br />Classification of Major Components -The components listed below comprise the major <br />part of the mapping unit: <br />A. Ustollic Haplargids (Brown Soils). <br />1. Fine-loamy, mixed, mesic. <br />(Cushman Series) <br />(Fort Collins Series) <br />(Pugsley Series) <br />(Olney Series) <br />B. Borollic Haplargids (Brown Soils). <br />1. Fine-loamy, mixed. <br />(Cushool Series) <br />(Forelle Series) <br />. (Alcova Series) <br />(Satanka Series) <br />(Fluetsch Series) <br />Exhibit 27-10 <br />