2015-02-26_REPORT - C1982056 (3)

Home Browse Search

SubTerra, Inc. Peabody Twentymile Coal LLC 09/27/2014 Foidel Creek Mine Permit Revision for Longwall Mining in the Wolf Creek Seam - Subsidence Evaluation (D) A detailed description of subsidence related phenomena predicted to occur within the permit and adjacent area; (E) The angle -of -draw predicted to be characteristic of the permit and adjacent area; and (F) Appropriate maps, prepared according to the standards of Section 2.10, showing: (1) Any existing subsidence features which exist within the permit and adjacent area; (II) The extent of the proposed mine workings; (III) The ground surface areal extent of an area determined by the projection of the angle of draw, if predicted pursuant to Section 2.05.6(6)(e)(i)(E) or 45', if no prediction is made by the applicant, from the limits of the proposed mine workings to the ground surface; and (IV) The areal extent of predicted subsidence related phenomena within the permit and adjacent area. (ii) A detailed description of material subsidence damage or diminution of reasonably foreseeable use of structures and renewable resource lands which could result from the occurrence of subsidence related phenomena predicted in accordance with Section 2.05.6(6)(e)(i)(D) within the permit and adjacent area, including consideration of the following: (A) Material subsidence damage means, with respect to structures, changes which make it technologically or economically infeasible to promptly restore the affected structures to the condition they would be in if subsidence had not occurred. (B) Material subsidence damage means, with respect to renewable resource lands, changes which disrupt an aquifer, or a recharge area to an aquifer, which serves as a beneficial use of water or changes which make it technologically or economically infeasible to restore the productivity of the affected renewable resource lands, expressed in terms of food, fiber or forage, to the level it would be if subsidence had not occurred. (C) A determination of diminution of reasonably foreseeable use of structures or renewable resource lands within the permit and adjacent area which shall consider the capability of those structures and lands, before and after subsidence occurrence, to support those uses described in Section 2.05.6(6)(b)(i)(A), giving consideration to factors such as soil and foundation characteristics, topography, vegetative cover, surface hydrology and groundwater hydrology. (ili) If the subsidence survey determines that no material damage or diminution of reasonably foreseeable use could result in the event of subsidence predicted to occur within the permit and adjacent area, and the Division concurs with that conclusion, the application shall include a subsidence monitoring program designed to determine the accuracy of the subsidence prediction required by Section 2.05.6(6)(e)(i)(D). (iv) If the subsidence survey determines that material damage or diminution of reasonable foreseeable use could result in the event of subsidence predicted to occur within the permit and adjacent area, or if the Division determines that such damage or diminution could 26 PN: 2013 -26