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ENVIRONMENTAL SOLUTIONS, INC. <br />P. O. Box 2996 Cheyenne, WY 82003 (307) 632-2666 <br />December 24, 2008 <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 />RE: Technical Revision No. 78, Addition of Sediment Control Structures in <br />East Pit Reclamation Area, Colowyo Coal Mine, Permit No. C-81-019. <br />Dear Mr. Stark, <br />On behalf of the Colowyo Mine, enclosed please find two copies of materials provided <br />for Technical Revision No. 78. This Technical Revision contains the design criteria and <br />SEDCAD modeling for sediment control structures, specifically a temporary sump and <br />three ditches, in the Prospect Drainage section in the East Pit Reclamation area. The <br />purpose of this revision is to comply with Part Five of the NOV CV-2008-004 <br />abatement, "submit a complete Technical Revision to the Division detailing methods <br />that will be immediately implemented in the Prospect watershed to reduce the peak flow <br />to the Prospect Pond." <br />Also included with the revision package are an application form, the public notice and <br />an index sheet. <br />If you have any questions or require additional information, please contact me at the <br />number shown above. <br />Give me a call if you have any questions. <br /> <br />DEC ! 41' I Sincerely, <br />Tom Peterson <br />Attachment