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Exhibit 60E <br />Subsidence Evaluation for the <br />South of Divide Mining and Dry Fork Areas <br />West Elk Mine <br />Mountain Coal Company <br />Prepared for <br />Arch Western Bituminous Group, LLC <br />PO Box 591 <br />Somerset CO 81434 <br />(970) 929-5015 <br />Fax (970) 929-5050 <br /> <br />Prepared by <br />Tetra Tech <br />PO Box 2730 <br />Missoula, MT 59806 <br />(406) 543-3045 <br />Fax (406) 543-3088 <br />September 28, 2007 <br />0