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SubTerra, Inc. Peabody Twentymile Coal LLC 09/27/2014 <br />Foidel Creek Mine <br />Permit Revision 14 -11 for Longwall Mining in the Wolf Creek Seam - Subsidence Evaluation <br />TABLE OF CONTENTS <br />Section Description page <br />No. No. <br />1. <br />INTRODUCTION .................................................................................... ..............................1 <br />1.1. <br />Prior Work ........................... ............................... <br />1.2. <br />Foidel Creek Mine Layout in the Wolf Creek Seam ............................. ..............................2 <br />1.3. <br />Pre and Post Mining Land Uses .......................................................... ..............................2 <br />1.4. <br />Potential Subsidence Impact Evaluation ............................................. ..............................2 <br />1.5. <br />Closure ............................................................................................... ..............................2 <br />2. <br />MINE SUBSIDENCE .............................................................................. ..............................3 <br />2.1. <br />Subsidence Mechanics ....................................................................... ..............................3 <br />2.2. <br />Subsidence Prediction ......................................................................... ..............................4 <br />3. <br />EVALUATION OF POTENTIAL IMPACTS TO THE ENERGY SPUR .... ..............................6 <br />3.1. <br />Scope of Work ..................................................................................... ..............................6 <br />3.2. <br />Approach ............................................................................................. ..............................6 <br />3.3. <br />Subsidence Prediction ......................................................................... ..............................7 <br />3.4. <br />Candidate Remedial Actions ........................................... ............................... <br />7 <br />3.4.1. Remedial Planning ....................................................................... ..............................7 <br />3.4.2. Possible Effects of Planned Remediation on Fish Creek and Its AVF .........................8 <br />4. <br />EVALUATION OF IMPACTS TO FISH AND FOIDEL CREEKS AND THEIR ALLUVIAL <br />VALLEYFLOORS (AVFS) .............................................................................. ..............................9 <br />4.1. <br />Scope of Work ..................................................................................... ..............................9 <br />4.2. <br />Subsidence Prediction... ..................................... .................................... <br />.9 <br />4.3. <br />Predicted Impacts to the AVF ............................................................. .............................10 <br />4.3.1. Increase in Fish Creek's Surface Area ........................................ .............................10 <br />4.3.2. Increase in Foidel Creek's Surface Area ..................................... .............................10 <br />4.3.3. Potential for Fissure Development and Water Loss (or Stream Pirating) ..................10 <br />4.4. <br />Monitoring Requirements ................................................................... .............................11 <br />5. <br />EVALUATION OF POTENTIAL IMPACTS TO POWERLINES ............. .............................12 <br />51. <br />Scope of Work .................................................................................. ............................... <br />12 <br />5.2. <br />Approach ............................................................................................ .............................12 <br />5.3. <br />Subsidence Prediction ........................................................................ .............................12 <br />5.3.1. Foidel Creek - Steamboat Transmission Line ................................. .............................12 <br />5.3.2. Archer - Hayden and Craig - Hayden - Steamboat Transmission Lines, ............................ <br />13 <br />i PN: 2013 -26 <br />