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DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866 -3567 <br />FAX: (303) 832 -8106 <br />August 3, 2011 <br />Mr. Tom L. Adams <br />Exxon Mobil Corporation <br />P.O. Box 2567 <br />Houston, TX 77252 -2567 <br />Re: Colony Shale Oil Project, Permit No. M- 1980 -047, Technical Revision Approval, Revision No. <br />TR -15 <br />Dear Mr. Adams: <br />On August 3, 2011 the Division of Reclamation, Mining and Safety approved the Technical Revision <br />application submitted to the Division on June 6, 2011, addressing the following: <br />Installation of grouted basin(s) below the Electrofrac(s) located in the Colony mine. <br />The terms of the Technical Revision No. 15 approved by the Division are hereby incorporated into Permit <br />No. M -1980 -047. All other conditions and requirements of Permit No. M -1980 -047 remain in full force and <br />effect. <br />The estimated liability amount of $30,000,000.00 exceeds the current amount of reclamation required at the <br />site and is adequate at this time. <br />If you have any questions, please contact me at (970) 241 -2042. <br />Sincerely, <br />Travis H. Marshall <br />Environmental Protection Specialist <br />ec: Steve Shuey, DRMS <br />David Bird, DRMS <br />Mark Del Pico, Exxon Mobile Corporation <br />Office of <br />Mined Land Reclamation <br />STATE OF COLORADO <br />RECEIVELD <br />AUG 04 zu <br />Divi ion 01 R ciarnaticri, <br />Mining and Safety <br />COLORADO <br />D I V I S I O N O F <br />RECLAMATION <br />MINING <br />— &— <br />SAFETY <br />John W. Hickenlooper <br />Governor <br />Mike King <br />Executive Director <br />Loretta E. Pineda <br />Director <br />Office of <br />Denver • Grand Junction • Durango Active and Inactive Mines <br />