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E <br />S co~co,~ny Seneca Coal Company <br />June 13, 2006 <br />Mx. Mike Boulay <br />Division of Minerals and Geology <br />1313 Shennau St, Room 215 <br />Denver, CO 80203 <br />(303) 866-3567 <br />RECEIVED <br />JUN 1 4 ?006 <br />RE: Yoast Mine (Permit No. 694-082) <br />Technical Revision (TR-29) <br />1'~ Response to Adequacy Comments <br />Dear Mt. Boulay, <br />~iYision rrf pAinerels and Geolo4Y <br />Enclosed please find three (3) copies of revised and/or additional information fox TR-29 addressing the Adequacy <br />Review comments in your May 1, 20061etter. The responses to each of the adequary comments are provided below <br />and aze numbered accordingly. <br />Several changer mere noted between the previously approved Port-mining Topogmply Map (Exhibit 20-2) and the nen~ Exhibit 20-2 <br />proposed with this revision Several channelr mere removed including YPM-3A, S-2, and 6A; new cbannelr include I'PM11-1, 6-3, <br />1 S, 17, 18, 19 and 20. Other changes mere noted ar follomr. The materrhed boundarier mere rrmove~ a new clothed and dotted line <br />hat been included around the Nonh Pit area and a portion of Hau! Road B down to the location of Pond 010, and the dirturbance <br />boundary hcu been removed around from around YPM-12. Pleare include the materrhed boundaries on Exhibit 20-2 or an another <br />appropriate exhibit (there are necraary for checking the adequacy of the SEDCAD demonrtmtionsJ, add an explanation of the dashed <br />and dotted line to the Legend of Exhibit 20-2, and rzplace the farmer di:rturfiance boundary around YPM-12. <br />Response: The watershed boundaries and potential disturbance boundaries along YPM-12 and Armand Draw have <br />been included on the exhibit while the "extraneous" lines have been removed <br />2. Please provide a signed and dated P.E. Certification and Engineer'r Statement for the new SEDCAD runt dated 02-2006 and <br />design tnformatian txbmitded forpott mine drainage channelr (Appendix 13-12.3J and Stock Pandr ST-1 and ST-2 (,lppendix 13- <br />12.5). The certifications and statementr can be added ar a slip-rbeet behind each of the exirting roverrheetrforAppendix i3-12.3 and <br />13-12.5. <br />Response: Signed and dated P.E. Certification and Engineer's Statement for the new SEDCAD runs dated 02-2006 <br />and design information submitted for post mine drainage channels (Appendix 13-12.3) and Stock Ponds ST-1 and ST-2 <br />(Appendix 13-12.5) are attached. <br />3. Port-mining channel design infomration it misting for channelr YPM-8 through 13 and YPM-16 an revived Figure 13-12.3. Pleare <br />update Figure 13-12.3 accordingly. <br />Response: Figure 13-12.3 has been revised appropriately to include channels YPM-8 through 13 and YPM-16. <br />Seneca Coal Company • P.O. Box 670 • Hayden, Colorado 81639 <br />Telephone X970) 278-3707 • FAX (970) 2763014 <br />