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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 />June 24, 2011 / <br />Mr. Tom L. Adams v <br />ExxonMobil `X <br />P.O. Box 2567 <br />Houston, TX 77252 -2567 <br />Re: ExxonMobil, Colony Oil Shale oject, Permit No. M- 1980 -047, Preliminary Adequacy Review, <br />Technical Revision, TR -15. <br />Dear Mr. Adams: <br />The Division of Reclamation, Mining and Safety reviewed the ExxonMobil request for a 112 Hard Rock, Metal <br />Technical Revision for the Colony Oil Shale Project, File No. M -1980 -047. A few minor issues must be addressed <br />before the revision can be approved. <br />1. What methods and criteria will be used to determine the effectiveness of the "grout curtain ". Please provide <br />in -depth detail as to what type of monitoring and testing will be conducted in the "grout integrity test holes ". <br />2. In the event that the "grout curtain" is subject to thermal fracturing and the possibility of fractures caused <br />naturally over time by natural forces, what methods of testing and monitoring will be employed to detect <br />fracturing that may degrade the effectiveness of the "grout curtain" during and after any future thermal <br />testing? <br />3. Please specify at what depth below EF1 and EF3 the proposed "grout curtain" will be constructed. <br />Please respond to the issues listed no later than July 1, 2011 so the decision date of July 6, 2011 can be met. If a <br />response or an extension to the decision date is not received by July 1, 2011 the technical revision may be denied. <br />If you need additional information, please contact me at the Division of Reclamation, Mining and Safety, Grand <br />Junction Field Office, 101 S. 3rd St., Suite 301, Grand Junction, Colorado 81501, telephone no. (970) 241 -2042. <br />Sincerely, <br />Travis Marshall <br />Environmental Protection Specialist <br />Cc: Steve Shuey, DRMS <br />Mark Del Pico, ExxonMobil (via e -mail) <br />Office of <br />Mined Land Reclamation Denver • Grand Junction • Durango <br />N ^I <br />STATE OF COLORADO <br />RECENO <br />JUN 2.7 2011 <br />Division otReclamation d Safety <br />it/fining <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 />Active and Inactive Mines <br />