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e <br />E~~ NECi4 <br />S c~~ccmva~r Seneca Coal Company <br />Mazch 29, 2007 <br />Mr. Michael Boulay <br />Division oEReclamation, Mining and Safety <br />101 South 3~d, Suite 301 p C 1~ ~ i ~ /~ g-~ <br />Grand Junction, CO 81501 f~Cl.r N J..I' <br />(970) 243-1571 MAR 3 0 2007 <br />RE: Yoast Mine (Permit No. C-94-082) Division of R~cla rtat;on, <br />Technical Revision No. 30 (TR30) Mining and Safely <br />Supplemental Postmine Channel Design Information <br />Dear Mx. Boulay: <br />Enclosed please Fmd two (2) copies of supplemental information for postmine channel designs at the <br />Yoast Mine. The supplemental information was discussed by representatives of Seneca Coal Company <br />(SCC) and Colorado Division of Reclamation, Mining and Safety (CDRMS) at a meeting in CDRMS's <br />Denver office on March 5, 2007. A third copy of this material has been sent to the Denver office also <br />addressed to you. <br />The supplemental information describes how SCC may use turf reinforcement mats (TRM) in several <br />postrnine channels. As we discussed, the design storm inputs aze based upon a revegetated watershed <br />condition and curve numbers were selected from the values approved fox the Seneca mines. Channel <br />geometry is based upon equipment limitations. <br />Attached are revised/updated material and insertion instructions. Should you or any other member of <br />the Division have questions regarding the information, please contact me at (970) 276-5227. <br />Sincerely, <br />~4'~ <br />Roy A. Karo <br />Reclamation Manager <br />Seneca Coal Company <br />enclosure(s) <br />cc: <br />John Husband (BLM) <br />Carl Johnston (OSMRE) <br />Seneca Coal Company • P.O. Box 670 • Hayden, Colorado 81639 <br />Telephone (970) 276-3707 • FAX (970) 276-3014 <br />