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• <br />Exhibit 55B <br />Stream Channel Parameters and Changes Due to Mining-Induced <br />Subsidence for the South of Divide and Dry Fork Mining Areas <br />West Elk Mine <br />Mountain Coal Company <br />Prepared for., <br />Arch Coal <br />PO Box 591 <br />Somerset CO 81434 <br />(970) 929-5015 <br />Fax (970) 929-5050 <br />r_..j <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 30, 2007 <br />0