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WCR Coal Coreholes (MR13- 269. MR13- 272. MR14 -275. MR14 -276. M R14 -277. and MR14 -278 <br />TC p poses to develop appropriate access, construct drill -pads, and drill and log up to 28 coreholes in the Eastern <br />Minin District (EMD) and Northern Mining District (NMD). The purpose of the proposed corehole program is to <br />more ccurately define the extent, configuration, and quality of the Wolf Creek Reserve (WCR), and to assess <br />overb en and coal physical and chemical characteristics, for planning and implementation of possible future <br />minin operations in this area. The proposed activities will occur on lands, and will' affect surface and minerals <br />owned) or controlled by TC, and would be conducted during the fall through summer of 2013 -2014, with some <br />activities potentially extending into fall 2014, as shown on Figures EX52 -171, EX52 -F2, EX52 -F3, EX52 -174, and <br />EX52 -F5, WCR Coal Coreholes. Environmental baseline studies, including cultural %source surveys and wildlife <br />consultation with Colorado Parks and Wildlife, have been completed for the proposed drill- sites, and are <br />documented by cultural resource survey reports (Exhibit 6L), and wildlife consultation letters. <br />Drill -sites have been selected and located to facilitate access from existing County, mine, and ranch roads. Minor <br />maintenance may be required for portions of the existing roads, including grading to address rills or washouts and <br />placement of suitable road -base materials or rock/gravel, to assure good access during any wet conditions and <br />minimize any road damage. Where direct access from existing roads is not feasible, drilling equipment and <br />supplies may travel overland short distances during periods when ground conditions are favorable to access the drill <br />sites, or short temporary connecting roads will be constructed. Where road maintenance or construction involves <br />any significant new disturbance, soil materials will be recovered and stockpiled for later use in reclamation, as <br />app ro 'ate. The maximum anticipated road maintenance /construction disturbance requirements would be <br />approximately 25,950 feet (14.9 acres with a 25 ft. maximum road disturbance width). <br />Drill pads will range from approximately 75 x 75 feet (0.15 acres) to 250 x 250 feet (1.43 acres) depending on <br />drilling conditions, with soil material stripping limited to an area around the drillhole collar, and the area <br />Burro ding any mud pits necessary to support drilling operations, in order to minimize disturbance and facilitate <br />site lamation. If additional site work is required to establish a level pad, any affected areas will be stripped and <br />the soil material stockpiled for use in reclaiming the site. Wattles, sediment fence, and/or berms will be used to <br />control site drainage and prevent off -site sediment transport, with drainage and sediment control for the associated <br />disturbance being address as Small Area, Exemptions (SAE'S). Nominal 4.805 -inch to 9.625 -inch drillholes will be <br />completed using conventional rotary drilling methods and drilling mud as the circulation medium, to depths ranging <br />from 800 to 1,800 feet. Any drilling fluids will be fully contained on site using either mud pits or temporary porta- <br />pits. Core samples will be recovered from all drillholes, and all drillholes will be geophysically logged. <br />On completion of drilling and logging, all drillholes will be plugged and sealed in accordance with State Engineer <br />requirements, and drill sites will be reclaimed by removing all equipment and supplies, allowing any mud pits to <br />dry-out, backfilling the pits, grading any disturbance to blend with the surrounding terrain and reestablish natural <br />drainage patterns, replacing stockpiled soil materials, and seeding with either the rangeland or dryland pasture seed <br />mixtures (dependent on the pre- disturbance vegetation community). <br />(3) Mine Facilities <br />(a) A narrative and maps, to meet the standards prescribed in 2.10, describing the location, <br />The existing Foidel Creek Mine surface facilities consist of building structures, material handling system, utilities, <br />and surface areas as shown on Map 24, Surface Facilities. Previously disturbed areas within the surface facilities <br />area may be leveled and then utilized for additional storage. <br />MR14 -278 2.05 -17.3 05/27/14 <br />