2016-03-10_REVISION - C1982056 (2)

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Peabod 1111 ENERGY Twentymile Coal, LLC Mr..lared Ebert, Environmental Protection Specialist Colorado Division of Reclamation, Mining, and Safety 1313 Sherman Street, Room 215 Denver, Colorado 80203 (303) 866-3567 X8120 29515 Routt County Road 27 Oak Creek, CO 80467 970.879.3800 March 9, 2016 12E: Twentymile Coal, LLC - Foidel Creek Mine (Permit No. C-82-056), Minor Revision (MR16-295) — 18LPassive Water Treatment System Geotechnical Investigations Dear Mr. Ebert: Twentymile Coal, LLC (TC) requests CDRMS approval of a Minor Revision (MR16-295) to our existing approved Permit to address site geotechnical investigations in conjunction with design, and subsequent construction, operation, maintenance, and reclamation of a planned passive water treatment system for dewatering of mine workings overlying portions of the Wolf Creek Reserves. The site geotechnical investigations are required to provide foundation and materials information for design and construction of a series of aerobic/anaerobic holding pond/wetland cells. Site geotechnical investigations for the passive treatment system will involve completion of eight backhoe test - pits to depths of approximately 15 feet; physical examination of the soil profile, and collection, examination, and testing of soil samples. The work will be clone under current snowpack conditions, with no road construction. A small dozer will clear any excess snow and pack -down a snow base for the backhoe and pickups to access the test -pit locations. Each test -pit will be backfilled on completion of sampling with the excavated material and leveled. Test -pit locations will be reseeded in the spring. It should be noted that all minor surface disturbance associated with the site geotechnical investigations falls within the footprint of previous cultural resource survey completed and submitted for the 5MN Pipeline and future passive treatment system (MR15-288). This submittal includes revised PAP text, exhibits; and maps, addressing the location, nature, configuration, and associated reclamation of areas affected by the proposed geotechnical investigations. It should be noted that the current approved permit language includes consideration of the types of activities proposed under this MR application (pages 2.05-84.9-10). New and revised PAP materials are identified by the attached Summary of Revisions/Additions. We would like to proceed with this work as soon as possible, and therefore, appreciate vour consideration and cooperation in facilitating timely review and approval of this revision application. After ti•ou have opportunity to review the accompanying information, please feel free to contact me with any questions or to discuss submittal materials or related matters. Best regards, T\\entymile Coal LC Jerry l� . N I ton Manager -n ironmental Affairs cc: Mile Berdine/TC Ed Brady/TC