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- I SHANN ENVIRONIMENTAL I <br />August 4, 2011 <br />KCCC — Colorado Coal Company <br />Colowyo Coal Mine <br />5731 State Highway 13 <br />Meeker, Colorado 81641 <br />Attn: Mr. Kurt Blunt <br />RE: SUMP AREA, COLLOM SPOIL FILL, COLOWYO MINE <br />MOFFAT AND RIO BLANCO COUNTIES, COLORADO <br />We have discussed the proposed sump geometry and potential effects on fill stability with <br />representatives of Colowyo. In our opinion, as long as the sump does not undercut the spoil fill <br />toe, then stability will not be adversely affected and the stability analyses in our previous report <br />remain valid (Geotechnical Study, Collom Temporary Spoil Fill, KCCC — Colowyo Mine, by <br />Shannon & Wilson, Project No. 23 -1- 01101 -400, dated July 30, 2009). <br />If you have any questions or require further information, please contact me at 303- 825 -3800. <br />Sincerely, <br />SHANNON & WILSON, INC. <br />Mark G. Gray, P.E. <br />1060 BANNOCK STREET, SUITE 200 <br />DENVER, COLORADO 80204 <br />PHONE 303.825.3800 <br />FAX 303.825.3801 <br />www.sh annonwilson.com <br />ALASKA <br />CALIFORNIA <br />COLORADO <br />FLORIDA <br />MISSOURI <br />OREGON <br />WASHINGTON <br />23 -1- 01101 -400 <br />