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cow NCOMPNly Seneca Coal Company <br />August 2, 2010 <br />Mr. Dan Mathews <br />Division of Reclamation, Mining and Safety <br />101 South 3`d, Suite 301 <br />Grand Junction, CO 81501 C'c!t/LI; D <br />(970) 243-1571 <br /> AUG 0 3 2010 <br />RE: Yoast Mine Permit No. C-94-082 <br />Diversion Ditch 14A Removal ?in; `"` }?eNon, <br />n? a <br /> rA S ? <br />Mr. Mathews, <br />With regard to the conversation during your July inspection concerning the removal of Diversion Ditch <br />14A, SCC has reviewed the permit and has the following comments: <br />• Tab 13, Appendix 13-12.1, Sediment Pond SEDCAD Results <br />- The original Pond 014 SEDCAD design indicates that no runoff was ever expected from the <br />watershed associated with Diversion Ditch 14A. <br />The original SEDCAD analysis designated the area as STR1, SWS2 (See page 13-12.1-130 and <br />Exhibit 13-12.1, Yoast Mine Watershed) <br />• SCC has rerun SEDCAD on the area to verify the initial documentation and that the undisturbed <br />watershed area above Diversion Ditch 14A is not expected to result in runoff or sedimentation during <br />a 10 yr/24 hr event. <br />- Diversion Ditch 14A SEDCAD Justification is attached for DRMS review. <br />• Since the ditch was not required during initial mining disturbance, a technical revision is not required <br />to reclaim the ditch. <br />If there are any questions or comments, contact me at (790) 276-5217. <br />Sincerel <br />Ro <br />Reclamation Manager <br />attachment(s) <br />cc: Sandra Brown (DRMS-Denver) <br />Seneca Coal Company • P.O. Box 670 • Hayden, Colorado 81639 <br />Telephone (970) 276-5217 . FAX (970) 276-5222