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<br />EXHIBIT 55B <br />STREAM CHANNEL PARAMETERS <br />AND CHANGES DUE TO LONGWALL <br />MINING-INDUCED SUBSIDENCE <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />MOUNTAIN COAL COMPANY, LLC <br /> <br />WEST ELK MINE <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />Prepared By: <br /> <br />Wright Water Engineers, Inc. <br />818 Colorado Avenue, Suite 307 <br />Glenwood Springs, CO 81601 <br /> <br /> <br />Revised December 2021 <br />