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• <br />Mountain Coal Company Exhibit 27 <br />West Elk Mine Characteristics of West Elk Mine Soil Mapping Units <br />Classification of !vl jor Components -The components listed below comprise the major <br />part of the mapping unit: <br />A. Pachic Haplustoll (Chesnut Regosol). <br />1. Fine-loatnv. mixed, mesic. <br />(Series unidentified) <br />B. Torriorthentic Haplustoll fChesnut Regosol). <br />1. Fine-loamy. mixed, mesic. <br />(Series unidentified) <br />C. Aridic Haplustoll (Chesnut Regosol). <br />1. Fine-loamy, mixed, mesic. <br />(Series unidentified) <br />D. Pachic Haploboroll (Chernozemic Regosol). <br />1. Fine-loamy, mixed. <br />(Shawa Series) <br />• <br />E. Torriorthentic Haploboroll. <br />1. Fine-loamy, mixed. <br />(Series unidentified) <br />Extent and Major Areas of Occurrence - Mapping unit number 26 includes a <br />moderately large acreage in the mine area. It occurs in largest acreage on the floodplains <br />of Minnesota Creek, the Dry Fork of Minnesota Creek, the East Fork of Minnesota <br />Creek. and their major tributaries. <br />Characteristic Toooeraohv -Soils of this mapping unit occur on gently to moderately <br />sloping floodplains and concave drainage channels. Slopes range from less than one <br />percent to about 20 percent. <br />Physical Properties - The soils of mapping unit number 26 are immature, normally <br />having thick dazk surface horizons (A horizons) with good granular structure. The dark <br />horizons extend for 30 or more inches, have a subangular blocks primary structure, and <br />also have a good granular secondary structure. <br />These soils can be handled over a moderate range of soil conditions without serious loss <br />of favorable physical properties; however. they can become puddled if handled when wet <br />or compacted if continuously traversed by heavy machines. <br />~J <br />Exhibit 27-18 <br />