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EXHIBIT 55B <br /> STREAM CHANNEL PARAMETERS <br /> AND CHANGES DUE TO LONGWALL <br /> MINING-INDUCED SUBSIDENCE <br /> MOUNTAIN COAL COMPANY, LLC <br /> WEST ELK MINE <br /> Prepared By: <br /> Wright Water Engineers, Inc. <br /> 818 Colorado Avenue, Suite 307 <br /> Glenwood Springs, CO 81601 <br /> Revised December 2020 <br />