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b d <br />ea <br />�illl Ea NERGY <br />Peabody Sage Creek Mining, LLC <br />November 14, 2013 I ED <br />Mr. Jason Musick NFU 18 Z013 <br />Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 pMSION OF RECLWM ,713N <br />Denver, CO 80203 -2273 MgtAG AND SAFEN <br />Peabody Sage Creek Mine <br />PO Box 250 <br />36600 Routt County Road 27 <br />Hayden, CO. 81639 <br />RE: Peabody Sage Creek Mine (Permit No. C- 2009 -087) — Minor Revision (MR23 -13) Pump <br />Discharge and Drainage Modifications <br />Dear Mr. Musick: <br />PSCM hereby requests a Minor Revision (MR23 -2013) to the approved Sage Creek Mine Permit (C- <br />2009 -087) for installation of a discharge pipe from the previously approved (MR20 -2013) mine <br />dewatering system and for installation of an intermediate culvert to help improve the drainage system. <br />MR20 -2013 approved installation of a mine dewatering system including a pump that would discharge <br />water to an adjacent ditch (RC -D3). Instead, PSCM would like to more efficiently route water through <br />the system by installing an HDPE pipe underneath Road C and the Laydown Area to discharge directly <br />into Ditch FA -D4. The pipe would be oriented to discharge downstream and the ditch would be armored <br />to prevent erosion. <br />Recent DRMS inspections have indicated drainage issues during extreme rain events causing an excess of <br />water to travel down Road D. PSCM proposes to install an intermediate culvert at the base of Road D to <br />catch this water and route it directly to the RD -D2A ditch to prevent water and sediment from running on <br />to the lower road (Road Q. <br />A SedCAD demonstration was completed assuming a drainage area consisting of the length of the road <br />from centerline to the road ditch (approximately 0.8 acres). The SedCAD report specifies that at least a <br />10" culvert be installed to accommodate flows from a 10 yr /24 hr storm event. PSCM proposes to install <br />a 24" culvert. Ditch RD -D2A and culvert SC -17 are both overdesigned and can accommodate the small <br />amount of additional flow. Culvert SC -17 discharges into ditch FA -D4 which is already designed to <br />accommodate all upstream flows. <br />This submittal contains the following items: <br />• DRMS Revision Application <br />• Text Edits <br />0 Exhibit 2.05.3- E2.G -2 (Summary Table — Operational Culvert Schedule) <br />