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ea !M 4 Peabody Sage Creek Mine <br />PO Box 250 <br />36600 Routt County Road 27 <br />Peabody Sage Creek Mining, LLC Hayden, CO. 81639 <br />August 1, 2012 <br />Mr. Jason Musick RECEF <br />Colorado Division of Reclamation Mining & Safety (DRMS) <br />1313 Sherman Street, Room 215 AUG 0 8 201? <br />Denver CO 80203 <br />fflgf Rec n, <br />lMhing,& -S <br />RE: Peabody Sage Creek Mine (Permit No. C- 2009 -087) Minor Revision (MR11 -12) <br />Dewatering Well, Disturbance Boundary, Drainage, and Tank Relocation <br />Mr. Musick: <br />Peabody Sage Creek Mining (PSCM) is submitting two (2) copies of the requested updates to the <br />Mine Permit (C- 2009 -087) as MR -11 for the following items: <br />• Disturbance Boundary Modification <br />• Million Gallon Tank Location <br />• Drainage Updates <br />• Correction to Baseline Hydrology Work Plan (Exhibit 2.04.7 -E1) <br />• Construction of a Dewatering Well. <br />The dewatering well will be constructed to reduce the inflow of water into the underground mine <br />workings. Water from the Seneca II reclamation spoils is filtering into the mine, and to reduce <br />the water pressure, water will be pumped from the well. <br />Water pumped from the well will be piped into ditch FA -D5, flow into FA -D8, and finally enter <br />into the Lower Sump. The design depth for FA -D5 only increases by 0.2 feet increasing the <br />original depth from 0.18 feet to a total of 0.38 feet. The total depth of the ditch is 1.33 feet, <br />leaving ample room for additional water. Ditch FA -D8 shows little change when the additional <br />water is added. The total depth of the water flow in the ditch will only increase by 0.01 foot and <br />the velocity will increase by only 0.05 feet. The Sedcad runs for these two ditches are included <br />with this cover letter as attachments. They were compared to Sedcad runs in Exhibit 2.05.3 -E2. <br />Because such a negligible change in created in ditch FA -D8, it is anticipated that there will be <br />little to no changes to the Lower Sump capacity. <br />Once you have had opportunity to review this submittal package, please feel free to contact me at <br />970 - 276 -7003 with any questions or comments. <br />