2015-10-02_REVISION - C1982056 (2)

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Peabod 1111 ENERGY Twentymile Coal, LLC 29515 Routt County Road 27 Oak Creek, CO 80467 970.879.3800 Mr. Jared Ebert October 2, 2015 Colorado Division of Reclamation, Mining and Safety 1313 Sherman St., Room 215 Denver, Colorado 80203 303.866.3567 X8120 Re: Minor Revision MR15-290, CRDA Soil Stockpile Relocation Dear Mr. Ebert; With this submittal, Twentymile Coal, LLC (TC) is requesting CDRMS approval of a Minor Revision (MR15-290) to our existing approved Mining and Reclamation Permit, to relocate the existing Coal Refuse Disposal Area (CRDA) Soil Stockpile to facilitate continuing expansion of the Refuse Disposal Area and relocation of the haul road and eastern perimeter ditch. The existing Soil Stockpile falls within the footprint of the active Refuse Disposal Area as it expands, so the existing Stockpile will need to be moved at some point in the near future. TC has identified an area just off the existing Refuse Haulroad that would be readily accessible and will result in a relatively short haul for both stockpiling and replacement of the soil material, as shown on Figure EX26D-Fl. The proposed new Soil Stockpile will be located on TC owned lands and includes previously disturbed areas near the existing Weather Station (access road) and reclaimed spoil areas to the northeast. Given that it encompasses previous or existing disturbance areas, the new Soil Stockpile footprint does not require any additional baseline characterization. Site preparation will be limited to construction of a short access road segment from the existing Refuse Haulroad, minor grading of the existing disturbed areas in the vicinity of the Weather Station, removal of soil and suitable cover material from any portions of the reclaimed areas within the new Stockpile area footprint which need to be regraded, and minor grading of the southern portion of the Stockpile area to establish a suitable stockpile foundation. The proposed new Stockpile area drains to existing designed CRDA drainage structures, (RDA -5A and RDA -7) so no additional drainage design or structures will be needed. It is anticipated that a berm, sediment control material, and/or wattles will be placed on the downgradient side of the new Soil Stockpile to limit sediment transport from the stockpile area in order to minimize ditch maintenance requirements, and that the Stockpile (except for a limited active placement area) will be reseeded with a temporary cover mixture to control erosion and sediment loss. TC needs to strip additional soil and cover material this fall to allow relocation of the haul road and eastern perimeter ditch next year, and provide for continued expansion of the active Refuse Disposal Area. TC will place the soil material stripped this fall in the proposed new location, and then plans to move the existing stockpiled soil material from its current location to the new Stockpile over the next two years. It is anticipated that the new Soil Stockpile will remain in-place for several years, with eventual use of the stockpiled soil material to reclaim the surface of the CRDA.