2015-02-26_REPORT - C1982056 (3)

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SubTerra, Inc. Peabody Twentymile Coal LLC 09/27/2014 Foidel Creek Mine Permit Revision for Longwall Mining in the Wolf Creek Seam - Subsidence Evaluation occur, the application shall include a subsidence control plan as described in Section 2.05.6(6)(f). (f) A subsidence control plan, prepared by appropriately qualified professionals, shall contain the following information: (i) A description of the physical conditions, such as depth of cover, seam thickness, and lithology, which affect the likelihood or extent of subsidence and subsidence- related damage; (ii) A detailed description of the mining method and other measures to be taken which may affect subsidence including: (A) The technique of coal removal, such as longwall mining, room and pillar removal, hydraulic mining or other methods, including the size, sequence, and timing for the development of underground workings as required by Rule 2.05.3(2)(b); and (B) The location and extent of areas in which planned subsidence mining methods will be used, including all areas where measures will be taken to prevent or minimize subsidence and subsidence - related damage. (iii) A detailed description of the measures to be taken to prevent subsidence from causing material damage or lessening the value or reasonably foreseeable use of the surface, including: (A) The anticipated effects of planned subsidence, if any; (B) Measures, if any, to be taken in the mine to reduce the likelihood of subsidence, including such measures as: (1) Backstowing or backfilling of voids; (11) Leaving support pillars of coal; and (III) Areas in which no coal removal is planned, including a description of the overlying area to be protected by leaving coal in place. (C) Measures to be taken on the surface to prevent material damage or lessening of the value or foreseeable use of the surface including such measures as: (1) Reinforcement of sensitive structures or features; (11) Installation of footers designed to reduce damage caused by movement; (111) Change of location of pipelines, utility lines or other features; (IV) Relocation of movable improvements to sites outside the angle -of -draw; and (V) Monitoring, if any, to determine the commencement and degree of subsidence so that other appropriate measures can be taken to prevent or reduce material damage. (iv) A detailed description of the measures to be taken to mitigate the effects of any material damage or diminution of value or foreseeable use of lands ;which may occur, including one or more of the following as required in 4.20.3: 27 PN: 2013 -26