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Peabod <br />Mr. Jason Musick <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />303.866.3567 X8134 <br />Dear Mr. Musick; <br />1111 ENERGY <br />Re: Minor Revision MR12 -265 and Exploration Notice of Intent, WMD Seismic Survey <br />With this submittal, Twentymile Coal, LLC (TC) is requesting CDRMS approval of a Minor Revision (MR12- <br />265) to our existing approved Mining and Reclamation Permit, and an Exploration Notice of Intent (NOI), for <br />completion of a seismic survey to better define the geology of the coal seams and structural features in an area to <br />the south of our present Western Mining District (WMD). Both an MR and NOI are required, due to the <br />location of the proposed seismic lines, which include areas both within and outside of the present Mine Permit <br />Boundary. <br />The proposed seismic survey will involve completion of five seismic lines, ranging from 5,500 to 8,800 feet in <br />length (total length approximately 37,600 feet) utilizing the "digi- pulse" method. This method involves the use <br />of an all- terrain vehicle - mounted impact hammer, and geophones connected to a mobile truck- mounted <br />receiver /recorder (see attached description). The proposed seismic program is anticipated to be completed <br />during January 2013, therefore, a snow -cat may be utilized to remove snow to facilitate access. The proposed <br />activities will, however, involve no direct ground disturbance, therefore there will be no bond associated with <br />this project. <br />The proposed activities will occur on lands owned or controlled by TC. TC is coordinating with Colorado Parks <br />and Wildlife, on a wildlife consultation for the project, for which a documentation letter will be forwarded on <br />receipt. <br />This submittal includes revised PAP text and supporting materials. TC would like to initiate the proposed <br />seismic activities as soon as possible, and therefore, requests the assistance and cooperation of the CDRMS is <br />completing review and approval of this application in a timely manner. Once you have opportunity to review <br />this submittal, please feel free to contact me with any questions, or to discuss the submittal and related matters. <br />We appreciate your attention and assistance. <br />Best regards, <br />erry gftleton <br />Ma <br />r Environmental Affairs <br />cc: Mike Berdine /TC <br />Rocky Thompson/PE <br />Twentymile Coal, LLC <br />29515 Routt County Road 27 <br />Oak Creek, CO 80467 <br />970.879.3800 <br />November 15, 2012 <br />