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Ryan Pawlowski <br />?V Colowyo Coal Company <br />?• 5731 State Highway 13 <br />0 Meeker, CO 81641 <br />M.r• <br />0 10 August 2010 <br />Mr. James R. Stark <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />v <br />AUG It Z010 <br />pays...:,, _ - r':jil, <br />Mining a ,d Sailetly <br />RE: Technical Revision No. 87, East Pit Sediment Control Structures and Spoil <br />Grading Map Update, Colowyo Coal Mine, Permit No. C-1981-019. <br />Dear Mr. Stark, <br />Enclosed please find two copies of materials provided for Technical Revision No. 87. This <br />change to the permit updates Map 29 - Spoil Grading by aiming focus toward final regrade <br />and reclamation of the East Pit. TR-87 modifies the timing blocks for East Pit reclamation <br />which had been established with TR-78 by absorbing the topsoil haulage corridor into the <br />advancing regrade timing blocks. A slight modification has also been made to the 2013 <br />timing block by adding one more year to this area, thus making this area available for <br />regrade in 2014. This modification will allow a two year gap between the three eastern <br />regrade blocks and the western most east pit timing blocks. A pause in regrade in this area <br />is necessary to allow the 2010, 2011, and 2012 timing blocks sufficient time for vegetation <br />to become securely established in the lowermost portion of the final East Pit regrade <br />location. <br />Colowyo's decision to submit a new spoil grading plan is a product of important and <br />strategic structural modifications within the East Pit. Five (5) sediment control structures <br />will be constructed in concert with regrade blocks located on Map 29. The locations of <br />these structures can be seen on Map 12 - Hydrology South. <br />Colowyo would like to point out that a swift review and response of this technical revision by <br />the Division is necessary for Colowyo to implement these structures during this reclamation <br />season and as the constraints of this TR deem appropriate. <br />Included with this revision package is an application form, the public notice, an index sheet <br />and other pertinent material associated with this revision application for incorporation into <br />the permit. <br />Should you have any questions or require additional information, please feel free to contact <br />me at (970) 824-1578. <br />Colowyo Coal Company, L.P. • 5731 State Highway 13 • Meeker, CO 81641 <br />T + 1 970 824 1578 • F +1 970 824 1598 - http://prospect.riotinto.org/irj/portal