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STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 275 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 <br />COLORADO <br />DIVISION OF <br />RECI.AMAi'ION <br />MINING <br />- &- <br />SAFE"I'Y <br /> Bill Owens <br />AUgnSt 7, 2(]07 Governor <br /> Russell George <br />ROy KarO Executive Director <br />Reclamation Mana <br />er Ronald W. Cattany <br />g Division Director <br />Seneca Coal Company Natural Resource Trustee <br />P.O. Box 670 <br />Hayden, CO 81639 <br />Re: Yoast Mine <br />Permit No. C-1994-082 <br />Technical Revision No. 35 (TR-35) <br />The Division of Reclamation, Mining, and Safety (Division) has completed our review of <br />TR-35 regarding the Postmine Channel YPM-21 design. The Division has the following <br />comment. <br />As a result of the addition of YPM-21 to the North Pit area, the watershed <br />conditions for Pond 010 have been revised. This is reflected on the revised <br />Exhibits 13-4B and 20-2 submitted for TR-35. However, the Pond 10 As-Built <br />Report Attachment 13-3A was not updated with the revised watershed conditions. <br />Please submit a revised As-Built Report Sedimentation Structure Pond 010 with <br />appropriately updated SEDCAD demonstrations for the 10, 25, and 100-Year, 24- <br />Hour storm events. <br />If you have questions or are in need of additional information, please contact me. <br />Sincerely, <br />~' fit" ~ ~~~" <br />Michael P. Boulay <br />Environmental Protection Specialist <br />C: Denver File <br />Office of Office of <br />Mined Land Reclamation Active and Inactive Mines <br />