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GCC Energy, LLC <br />(C) Proposed Method for Plugging Drill Holes <br />Drill holes would be sealed by replacing cuttings or other suitable media in the hole and then placing a <br />suitable plug 10 feet below the ground surface for support of a cement plug, within 5 feet of the ground <br />surface. No water is anticipated to be intercepted during the drilling due to the water table lying below the <br />coal seam. In the event water is encountered, the cuttings pit would provide sufficient volume to handle <br />water. The drill hole would then be finished with air. <br />(D) Estimated Size and Depth of Drill Holes, Trenches, and Test Pits <br />Site disturbance would be restricted to a 100 -foot by 100 -foot square at each proposed drill site. Each drill <br />site would be up to 10,000 square feet (0.23 acre) in size, resulting in a maximum total surface <br />disturbance of 5.52 acres for the 24 drill sites. Drilling will be with air, air with water injection or water. <br />Cuttings pits will be necessary at all locations drilled by conventional methods. <br />A cutting pit will be constructed to capture the cuttings for replacement into the completed borehole prior <br />to plugging the hole, and would be reclaimed to pre -disturbance condition, or as specified by BLM and/or <br />the UMU tribe. Cuttings pits would be located away from natural depressions and watercourse in a <br />manner that prevents natural runoff from entering the pit. Cuttings pits would be constructed with a <br />capacity adequate for the anticipated volume of effluent. Topsoil would be removed and stockpiled prior <br />to cuttings pit excavation to prevent contamination, minimize erosion loss, and to aid in reclamation. <br />GCC does not anticipate the excavation of trenches or test pits as part of the exploration plan. Drill hole <br />depth, length of access roads, length of rotary drilling, and length of core drilling per hole are listed in <br />Table 2. <br />Table 2. Drill Hole Depths <br />Federal Coal Exploration Plan <br />May 2014 <br />8 <br />GCC -14-01 <br />90 <br />GCC -14-02 <br />260 <br />GCC -14-03 <br />270 <br />GCC -14-04 <br />215 <br />GCC -14-05 <br />250 <br />GCC -14-06 <br />310 <br />GCC -14-07 <br />275 <br />GCC -14-08 <br />330 <br />GCC -14-09 <br />330 <br />GCC -14-10 <br />290 <br />GCC -14-11 <br />305 <br />GCC -14-12 <br />295 <br />GCC -14-13 <br />255 <br />GCC -14-14 <br />295 <br />GCC -14-15 <br />235 <br />Table 2. Drill Hole Depths <br />Federal Coal Exploration Plan <br />May 2014 <br />8 <br />