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KC*oDNR <br />October 27, 2016 <br />COLORADO <br />Division of Reclamation, <br />Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Miranda Blomquist <br />Twentymile Coal, LLC. <br />29515 Routt County Road 27 <br />Oak Creek, CO 80467 <br />RE: Peabody Sage Creek Nfine, C-2009-087,2016 Rill and Gully Map Review <br />Dear Ms. Blomquist: <br />The Colorado Division of Reclamation, Mining, and Safety (Division) has reviewed the 2016 Rill and <br />Gully and Maintenance Map. The map was submitted on October 19, 2016. The map depicts two area <br />where previous rills and gullies have been observed. One area is located in the SIIPM-6 drainage west of <br />stock tank T-32 in non -Phase III release areas. Another rill and gully is noted in the reclaimed solid waste <br />disposal area. In accordance with Rule 4.14.6, rills and gullies which form in areas that have been <br />regraded and topsoiled shall be filled, regraded, or otherwise stabilized when such rills and gullies: (1) <br />disrupt the approved postmining land use; (2) prohibit successful revegetation; or (3) cause or contribute <br />to a violation of water quality standards for a receiving stream. If any of the identified rills and gullies <br />meets the criteria set forth in Rule 4.14.6, please take the necessary corrective action. Please keep in <br />mind that effort should be made to limit the extent of rill and gully stabilization efforts in order to not re- <br />initiate the 10 -year liability period in accordance with Rule 4.15.7(5)(a). <br />The map also depicts several areas where maintenance has been required. These areas include the smart <br />ditches above the portal area (FA -D5 and FA -D6), the slump above the portal, the repairs to the Pond 004 <br />outlet, culvert SC -27 and a weed control area above the lower sump. Peabody Sage Creek Mining should <br />continue to monitor these areas and conduct any of the required maintenance. The Division will also <br />monitor these area during regular monthly inspections. <br />If you have any questions feel free to contact me at (303) 866-3567, extension 8120. <br />Sincerely, <br />P��6)_at_ <br />Jared Ebert <br />Environmental Protection Specialist III <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining. state. co. us <br />John W. Hickenlooper, Governor I Mike King, Executive Director I Virginia Brannon, Director <br />OF COLO <br />I <br />F1876 <br />