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Peabod <br />1111 ENERGY <br />Twentymile Coal, LLC <br />��++ �% 29515 Routt County Road 27 <br />RF -VE' ` ED 970 879.38 0Oak Creek, 0 80467 <br />Mr. Jared Ebert, Environmental Protection Specialist MAR 15 2016 March 9, 2016 <br />Colorado Division of Reclamation, Mining, and Safety <br />1313 Sherman Street, Room 215 ONISION OF PEC <br />LAMATION <br />Denver, Colorado 80203 MINING & SAFETY <br />(303) 866-3567 X8120 <br />RE: Twentymile Coal, LLC - Foidel Creek Mine (Permit No. C-82-056), Minor Revision (MR16-295) — <br />18LPassive Water Treatment System Geotechnical Investigations <br />Dear Mr. Ebert: <br />Twentymile Coal, LLC (TC) requests CDRMS approval of a Minor Revision (MR16-295) to our existing <br />approved Permit to address site geotechnical investigations in conjunction with design, and subsequent <br />construction, operation, maintenance, and reclamation of a planned passive water treatment system for <br />dewatering of mine workings overlying portions of the Wolf Creek Reserves. The site geotechnical <br />investigations are required to provide foundation and materials information for design and construction of a <br />series of aerobic/anaerobic holding pond/wetland cells. <br />Site geotechnical investigations for the passive treatment system will involve completion of eight backhoe test - <br />pits to depths of approximately 15 feet; physical examination of the soil profile, and collection, examination, and <br />testing of soil samples. The work will be done under current snowpack conditions, with no road construction. <br />A small dozer will clear any excess snow and pack -down a snow base for the backhoe and pickups to access the <br />test -pit locations. Each test -pit will be backfilled on completion of sampling with the excavated material and <br />leveled. Test -pit locations will be reseeded in the spring. It should be noted that all minor surface disturbance <br />associated with the site geotechnical investigations falls within the footprint of previous cultural resource survey <br />completed and submitted for the 5MN Pipeline and future passive treatment system (MRI 5-288). <br />This submittal includes revised PAP text, exhibits; and maps, addressing the location, nature, configuration, and <br />associated reclamation of areas affected by the proposed geotechnical investigations. It should be noted that the <br />current approved permit language includes consideration of the types of activities proposed under this MR <br />application (pages 2.05-84.9-10). New and revised PAP materials are identified by the attached Summary of <br />Revisions/Additions. We would like to proceed with this work as soon as possible, and therefore, appreciate <br />your consideration and cooperation in facilitating timely review and approval of this revision application. After <br />you have opportunity to review the accompanying information, please feel free to contact me with any questions <br />or to discuss submittal materials or related matters. <br />Best re-ards. <br />Tx\entvmile C <br />Jerry . N I ton <br />Manager n ironmental Affairs <br />cc: Mike Berdine/TC <br />Ed Brady/TC <br />