Laserfiche WebLink
J. E. STOVER & ASSOCIATES, INC. <br />2352 NORTH 7T" STREET, UNIT B <br />GRAND JUNCTION, COLORADO 81501 <br />PHONE: (970) 245-4101, FAX: (970) 242-7908 <br />MINE ENGINEERING <br />MINE RECLAMATION <br />March 26, 2018 <br />Clayton Wein <br />Division of Reclamation, Mining & Safety <br />1313 Sherman St., Room 215 RECEIVED <br />Denver, CO 80203 <br />Re: Bowie Resources, LLC, Bowie No. 2 Mine MAR '9 2018 <br />Permit C-1996-083 biftion of Reclam,tition, <br />Technical Revision #115, Milling & S•fety <br />Temporary and permanent rip rap design <br />Dear Mr. Wein: <br />CIVIL ENGINEERING <br />CONST. MANAGEMENT <br />On behalf of Bowie Resources LLC, enclosed is an application for a technical revision to install temporary <br />rip rap in Ditch F8, and another section of rip rap in the East Diversion ditch which will be permanent. <br />Sizing for the riprap in Ditch F8 is based upon flows from Ditch F8 and the runoff from the top of the pile. <br />The runoff from the top of pile #2 has been calculated with SedCad and will be incorporated into the <br />permit. <br />In addition to the riprap in Ditch F8, there will be rip rap placed at the outlet of Temporary Culvert T -F1, <br />which will be designed based on the combined peak flows for T -F1 and Ditch F-8. Both sections of riprap <br />are considered temporary. In addition, the flow data for T -F1 has been updated based on the current <br />configuration of the top of gob pile #2, therefore, page App. B-102 has been revised. <br />The new segment of riprap in the East Diversion ditch will be D50=9" as per the approved rip rap design <br />for the East Diversion ditch. While the segment only has a channel slope of 7%, a larger rip rap size will <br />perform better long term and for high intensity short duration storms. <br />Please see revised pages Volume II, Maps 15-3, 20 and 21-3. Volume IX pages App. B-102, B-102i-102vi. <br />Feel free to contact me if you have any questions. <br />Sincerely, <br />Tamme Bishop, P.E. <br />Project Engineer <br />Cc: Bill Bear <br />