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coal Nw Seneca Coal Company <br />June 10, 2011 <br />RECF_eVEo <br />Ms. Susan Burgmaier <br />Division of Reclamation, Mining and Safety JUN 1 S 2 o l l <br />1313 Sherman Street, Room 215 Divislur' OY Rcciamation, <br />Denver, CO 80203 Mining and Safely <br />RE: Seneca II-W Mine (Permit C-1982-057) <br />Technical Revision (TR 75), NOV #CV-2011-001, Lower Portion of Channel 006 Gulch <br />Abatement Design <br />Ms. Burgmaier, <br />Seneca Coal Company (SCC) is submitting this Technical Revision (TR-75) to present an abatement <br />design for a lower portion of Channel 006. The approach and methodology to design this portion of the <br />channel includes the following: <br />• Use the 25 yr/24 hr discharge from Pond 006 = 114.65 cfs (See Attachment 13-4D, Seneca II-W Pond <br />6 Phase V (25 yr) page 4) <br />• Use SEDCAD4 Channel Design with riprap <br />• Leave west side of channel slope at approximately the existing slope and line with riprap <br />• Reconfigure east slope to include a toe drain and riprap lined channel slope <br />Enclosed are two (2) copies of TR-73, the application form, public notice, and revised material for <br />insertion into the PAP. If there are any questions or comments, please contact me at (970) 276-5217. <br />Sincerely, <br />Roy A. Karo <br />Reclamation Manager <br />enclosure(s) <br />cc: Foster Kirby (OSMRE) <br />Jennifer Maiola (BLM) <br />Seneca Coal Company • P.O. Box 670 • Hayden, Colorado 81639 <br />Telephone (970) 276-5219 • FAX (970) 276-5222 <br />