2014-09-05_REVISION - C1982056 (2)

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Peab I 1111 ENERGY Twentymile Coal, LLC 29515 Routt County Road 27 Oak Creek, CO 80467 970.879.3800 Mr. Jason Musick JAL % \ August 25, 2014 Colorado Division of Reclamation, Mining and Safety �� " a��or' 1313 Sherman St., Room 215 5 oReosa{ l Denver, Colorado 80203 ��v�sM��rg� 303.866.3567 X8134 Re: Minor Revision MR14 -281, Monitoring Well WC -008A Relocation and Corehole WCO28 Dear Mr. Musick; With this submittal, Twentymile Coal, LLC (TC) is requesting CDRMS approval of a Minor Revision (MR14 -281) to our existing approved Mining and Reclamation Permit, to relocate the proposed upgradient groundwater monitoring well (WC -008 to WC -008A) for the Wolf Creek Reserve (WCR) area, and to drill, sample, log, and reclaim an additional corehole (WC -028) to the north of the presently defined reserve block. TC's original intent was to pull the casing for Corehole WC -008, ream the corehole to a larger diameter, install surface and well casing consistent with the approved monitoring well completion diagram, and complete and develop the well as the upgradient monitoring well for development of the Wolf Creek Reserve. As a result of review of the results of ongoing drilling activities, TC has determined that there may be an opportunity to add or extend longwall panels on the south edge of the Wolf Creek Reserve block. Given this consideration, there is the potential that the planned location for Monitoring Well WC -008 would not be practical, since the planned well location could be mined - through. Therefore, TC has identified an alternate location for upgradient Monitoring Well WC -008A, and proposes to relocate this well. TC is proposing an additional corehole (WC -028) to delineate the northwestern limit of the Wolf Creek Reserve block and to determine the alignment of the development mains in this area. The proposed activities will occur on lands, and will affect surface and minerals owned or controlled by TC (WC -008A — Twentymile surface and minerals; WC -028 — State surface and minerals). The proposed drilling and reclamation activities will be conducted during fall 2014, as shown on Figure EX52 -F7, WCR Drilling. Environmental baseline studies, including cultural resource surveys and wildlife consultation with Colorado Parks and Wildlife, have been completed for the proposed drill sites, and will be documented by a cultural resource survey report and wildlife consultation letter, which will be forwarded on receipt. Drill -sites have been selected and located to facilitate access from existing County, mine, and ranch roads. Minor maintenance may be required for portions of the existing ranch roads, including grading to address rills or washouts and placement of suitable road -base materials or rock/gravel, to assure good access during any wet conditions and minimize any road damage. Where direct access from existing roads is not feasible, drilling equipment and supplies may travel overland short distances during periods when ground conditions are favorable to access the drill sites, or temporary connecting roads will be constructed. Where road maintenance or construction involve any significant new