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April 20, 2012 <br />Rob Zuber R SCEAV° <br />Division of Reclamation, Mining and Safety <br />1313 Sherman St., Room 215 APR 2 3 2012 <br />Denver, CO 80203 <br />Drveion ui an d gee ion. <br />Re: New Elk Mine Permit C- 1981 -012 Mining <br />Minor Revision No. 112 - Adequacy Response #1 <br />Expand DWDA <br />MINE ENGINEERING CIVIL ENGINEERING <br />MINE RECLAMATION CONST. MANAGEMENT <br />Dear Mr. Zuber: <br />J. E. STOVER & ASSOCIATES, INC. <br />2352 NORTH 7 STREET, UNIT B <br />GRAND JUNCTION, COLORADO 81501 <br />PHONE: (970) 245 -4101, FAX 242 -7908 <br />On behalf of New Elk Coal Company, (NECC) enclosed is adequacy response #1. <br />A SedCad demonstration (Exhibit 19(23)) for ditches D12 and D14 and culvert C13 is <br />attached. Ditches D12 and D14 were approved under TR -60 as trapezoidal channels with ditch <br />depths of approximately 1.0', ditch slopes of 1.0 %, and bottom widths of 3.0'. Ditches D12 and <br />D14 have adequate capacity to safely pass the runoff from the DWDA expansion. Revised <br />Tables 20 and 21 are attached and update the peak flows associated with each ditch and <br />culvert. <br />Please call or email with any questions. <br />Sincerely, <br />¥h / <br />Tamme Bishop, P.E. <br />Project Engineer <br />cc: Ron Thompson, NECC <br />Mike Trujillo, CDOW <br />Attachments: (3) <br />MR -112 Adequacy Transmittal letter dated April 20, 2012 <br />MR -112 Exhibit 19(23) dated April 20, 2012 <br />MR -112 Table 20, page 2.05 -11, dated April 20, 2012 <br />MR -112 Table 21, page 2.05 -14, dated April 20, 2012 <br />