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J. E. STOVER & ASSOCIATES, INC. <br />2352 NORTH 7T" STREEET, UNIT B <br />GRAND JUNCTION, COLORADO 81501 <br />PHONE: (970) 245 -4101, FAX: (970) 242 -7908 <br />MINE ENGINEERING <br />MINE RECLAMATION <br />September 19, 2013 O <br />Susan Burgmaier O,�n� <br />Division of Reclamation, Mining & Safety �`�, n� <br />1313 Sherman St., Room 215 &M, <br />Denver, CO 80203 of Qe ga <br />Re: Bowie No. 1 Mine <br />Minor Revision No. 131, <br />Revise channel lining for upper segment of reclaimed Ditch 7 <br />Permit C- 1981 -038 <br />Dear Ms. Burgmaier: <br />CIVIL ENGINEERING <br />CONST. MANAGEMENT <br />On behalf of Bowie Resources, LLC, enclosed is an application for a minor revision to revise the <br />channel lining for the upper segment of Ditch 7. <br />In 2012 Bowie Resources, LLC installed well graded riprap in reclaimed Ditch 7. During a large storm <br />event in July 2013, the upper section of riprap sustained substantial erosion. The channel lining in <br />the upper segment of Ditch 7, as shown on attached Figure 1, will be changed to grouted riprap. The <br />grout will be a low strength concrete and the purpose is to fill the voids between the rock in order to <br />anchor the riprap on the steep slope. To the extent possible, the grout will be placed between the <br />rocks, so the roughness (Manning's n) will not change. In addition, as the channel makes the curve, <br />the bank will be fortified by increasing the bank height, and lining at least a portion of the bank with <br />grouted riprap. <br />Supporting documentation follows. <br />No increase in bond required. Ditch 7 is a permanent drainage feature. <br />Sincerely, <br />C �` , ,, - A7WM,e, Q t`A- <br />Tamme Bishop, P.E. <br />Project Engineer <br />cc: Basil Bear <br />Enclosures: <br />Volume 6A: Pages 6a & 6e <br />