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C ?S?p °07 <br />II-EcenmD C" '. <br />j MAY 0 <br />1 2009 <br />Division or Keciamation, <br />Mining and Safety <br />NORTH FORK VALLEY SEISMIC NETWORK <br />MONITORING REPORT <br />MOUNTAIN COAL COMPANY <br />WEST ELK MINE <br />SOMERSET, COLORADO <br />22 February 2008 <br />Prepared by <br />Jacqueline Bott, Ivan Wong, and Fabia Terra <br />Seismic Hazards Group <br />URS Corporation <br />1333 Broadway, Suite 800 <br />Oakland, CA 94612 <br />FOURTH QUARTER <br />2007