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Mountain Coal Company Exhibit 27 <br />• West Elk Mine Characteristics of West Elk Mine Soil Mapping Units <br />There is no evidence of detrimental accumulation of sodium or other soluble salts in the <br />soils of this unit. <br />Mapping Unit Number 20 - Moderately deep (20 to 40 inches to bedrock) and deep <br />(more than ~0 inches [o bedrock), dark colored, from poor to poorly drained soils having <br />thick surface horizons iA horizons) and mottled subsurface horizons (B2t horizons) of <br />low chroma occurring in patts of the study area in which the mean summer soil <br />temperatures iJune. July. and August mean temperature measured at 20 inches) is ~~`F <br />or higher. <br />Classitication of Ivtajor Components -The components listed below comprise the major <br />part of the mapping unit: <br />A. Cumulic Haplaquoll (Humic-Glei Soils). <br />1. Fine-loamy, mixed, mesic. <br />(McClave Series) <br />2. Fine-loamy, mixed, frigid. <br />(Marshdale Series) <br />• B. Typic Haplaquoll (Humic-Glei Soils). <br />1. Fine-loamy, mixed, mesic. <br />(Broomfield Series) <br />2. Fine-loamy, mixed, frigid. <br />(Yampa Series) <br />Extent and Major Areas of Occurrence - Mapping unit number 20 has a small total <br />acreage. It occurs on the floodplain of the Dry Fork of Minnesota Creek or its <br />tributaries and is associated with beaver activity. <br />Characteristic Tooooraohv -These soils occur in nearly level to very gently concave <br />portions of floodplains. Drainage has been restricted by beaver dams. <br />Physical Properties - Because of their nearly constantly saturated condition, <br />measurement of physical properties must be interpreted in light of their natural state. <br />It would be nearly impossible to handle the soils of this unit at any condition other than <br />near saturation. In consequence, irreversible puddling with complete loss of favorable <br />structure cannot be avoided. The degree to which favorable aeration and permeability <br />could be restored to dried materials after relocation is not known, but since these <br />materials are not highly organic it is probable that it would be a difficult task. <br /> <br />Exhibit 27-15 <br />