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development will add approximately 2,430 acres; and Interim Phase III development will add approximately 20
<br /> acres to the affected area. Areas to be developed in the WMD during the current and subsequent permit terms are
<br /> shown on Map 23 Mine Plan. Alignment of development entries may be adjusted, as necessary, to address
<br /> geologic conditions. The preliminary development layout will include main and sub-main development work as
<br /> described in the referenced Permit Revisions. The dimension of pillars in these development areas may vary
<br /> based upon mining conditions. Sumps and ventilation doglegs will be added as needed. Locations for these
<br /> minor operational features are not provided on Map 23, due to the need for some flexibility in the placement of
<br /> these features.
<br /> During the Phase I, II, and Interim III WMD development, preliminary development work will be conducted
<br /> under the Fish Creek AVF, Fish Creek, several powerlines, and several stock ponds. A more detailed discussion
<br /> of undermining these structures is presented under the subsidence discussion. Because the preliminary
<br /> development work(WMD, Panels 13-through 17-Left)) will be limited to main and sub-main entry development
<br /> with retention of support pillars, no subsidence will be associated with these activities.
<br /> WOLF CREEK RESERVE(WCR)
<br /> WCR Development and Mining (Rock-Slope Access, Development and Mining of Panels WC-4RT through
<br /> 9RT, TR13-83,TR18-92,PR14-10,PR15-11)
<br /> Development and mining of the WCR will result in limited change in surface disturbance and affected areas, since
<br /> development and mining activities will occur primarily within the boundaries of areas previously affected by
<br /> development and mining in the EMD and NMD. Planned mining in the WCR will result in an incremental
<br /> affected area of approximately 124 acres where Panels WC-4RT through 6RT, and 7-East extend beyond the
<br /> previous mining limits on the eastern side of the WCR. Areas to be developed in the WCR during the current
<br /> permit term are shown on Map WC23, Wolf Creek Mine Plan. Alignment of development entries may be
<br /> adjusted, as necessary, to address geologic conditions. The preliminary development layout will include the rock-
<br /> slope access and main and sub-main development work as described in the referenced Permit Revision. The
<br /> dimension of pillars in these development areas may vary based upon mining conditions. Sumps and ventilation
<br /> doglegs will be added as needed. Locations for these minor operational features are not provided on Map WC23,
<br /> due to the need for some flexibility in the placement of these features.
<br /> Development and mining in the WCR will be conducted under portions of the Fish Creek AVF, Fish Creek, the
<br /> Union Pacific Energy railroad spur, County Road 33, Foidel Creek, several powerlines, and several stock ponds.
<br /> A more detailed discussion of undermining these structures is presented under the subsidence discussion.
<br /> Underground Drillholes (MRO1-172—Withdrawn 07/11/01)
<br /> 2011-2012 WMD Exploration Program(MR11-256)
<br /> TC proposes to construct drill-pads, and drill and log up to 7 exploration drillholes in the active WMD, in order to
<br /> better delineate coal seam thickness and characteristics, and to more accurately define structural conditions,
<br /> including faulting. The proposed drillhole locations as shown on Figure EX52-F1, 2011-2012 WMD Exploration
<br /> Program, and Map 24, are on lands where TC is the surface owner, and the coal is under either fee (drillholes
<br /> TCW001, 002, 004, 005, 006, and 007), or Federal (drillhole TCW003) ownership. The proposed drill-sites have
<br /> been evaluated for both potential cultural resource and wildlife impacts, as documented by the cultural resource
<br /> survey report included in Exhibit 6L and the wildlife consultation letter provided in Exhibit 23C.
<br /> Drill-sites have been selected and located to facilitate access from existing County and ranch roads. Where direct
<br /> access from existing roads is not feasible, drilling equipment and supplies will travel overland short distances
<br /> during periods when ground conditions are favorable,to access the drill sites. Drill pads will be approximately 75
<br /> x 75 feet(0.15 acres),with soil material stripping limited to an area around the drillhole collar, and the area
<br /> surrounding any containment pits necessary to support drilling operations, in order to minimize disturbance and
<br /> facilitate site reclamation. If required, any containment pits will be excavated to provide sufficient capacity for
<br /> TRI 8-92 2.05-17.1 09/26/18
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