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~ ~~'~ S rHANNON ~IWILSONs ILNCs <br />July 7, 2006 <br />Rio Tinto Energy America <br />Colowyo Coal Mine <br />5731 State Highwtry 13 <br />Meeker, Colorado 81641 <br />Attn: Mr. "fay Tonazzi and Mr. Juan Garcia <br />RE: GEOTECHNICAL STUDY, <br />SOUTH TAYLOR EXCESS SPOIL FILLS, <br />RIO TINTO ENERGY AMERICA, <br />COLOWYO COAL MINE <br />Enclosed is our geotechnical report for desigm of the above-referenced project. This report <br />• presents the results of our field explorations and laboratory tests, presents the results of our <br />stability analyses, and provides geotechnical recommendations. <br />We appreciate the opportunity to be of service to you on this project. If you have any questions <br />or require further infomlation, please contact me at 303-825-3800. <br />Sincerely, <br />SHANNON & R'I <br />Mark G.,Gray, P <br />Senior Associate <br />MGG:GRF <br />Enclosure: Geotechnica] Study <br />1440 BLAKE STREET, SUITE 150 <br />DENVER, COLORADO 80202 <br />PHONE 303.825.3800 <br />FAX 303.825.3801 <br />www. Shan nonwilson.com <br />~e~ <br />,~•~a-xzm <br />23-1-01105-200 <br />