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A <br /> <br />U.S. Department of Labor <br />MAY 13 2008 <br />Mine Safety and Heahh Adminisftdon <br />P.O. Box 25367 <br />Denver, Colorado 80225-0367 <br />Coal Mine Safety and Health <br />District 9 <br />Q P <br />h <br />TEE O! N <br />Walter Scheller <br />Colorado Group Executive <br />Twentymile Coal Company <br />29515 Routt County Road #27 <br />Oak Creek, CO 80467 <br />Dear Mr. Scheller: <br />RE: Foidel Creek Mine <br />ID No. 05-03836 <br />6MN Storage Reservoir <br />ID No. 1211-Co-09-03836-06 <br />Impoundment Construction Plan <br />The construction plan, dated September 27, 2007, with additional <br />information submitted October 9, 2007, for the referenced <br />impoundment, has been reviewed by MSHA personnel and is approved <br />in accordance with 30 CFR 77.216(b). <br />The impoundment construction plan consists of the following: <br />1. Three cover letters, dated October 9, 2007, <br />September 27, 2007 and August 7, 2007 <br />2. Technical Revision TR07-61 6MN Mine Water Storage <br />Reservoir Technical Adequacy Responses, dated <br />September 27, 2007 <br />3. Three pages of Exhibit 8CC-Drainage Designs (TR07-61) <br />4. 6MN Mine Water Storage Reservoir - PMP Design Basis <br />5. 6MN Pond Location Figure <br />6. 18 pages of 6MN Storage Reservoir SEDCAD4 output, dated <br />September 27, 2007 <br />7. 3 pages of Spillway Flow SEDCAD4 output, dated <br />September 27, 2007 <br />8. Stage Storage Curve - 6MN Storage Reservoir <br />9. Watershed and Structure Exhibit <br />10. A 43 page Geotechnical Investigation Report by Northwest <br />Colorado Consultants, Inc. (NWCC) <br />11. An 11 page Slope Stability Evaluation by NWCC <br />12. A 14 page 6MN Storage Reservoir and Infrastructure <br />General Scope of Work <br />13. Exhibit 490 - 6MN Mine Water Storage Reservoir Design <br />Drawings (TR07-61) containing 3 pages of certifications, <br />5 figures, and 5 Exhibits