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SubTerra, Inc. Peabody Twentymile Coal LLC 09127/2014 <br />Foidel Creek Mine <br />Permit Revision for Longwall Mining in the Wolf Creek Seam - Subsidence Evaluation <br />5.4. Power Line Subsidence ...................................................................... .............................13 <br />5.4.1. Clearance Issues ........................................................................ .............................13 <br />5.4.2. Structure Tilt..... .......................................... I ............................................................. 14 <br />5.4.3. Differential Movements across the Structures ............................. .............................14 <br />5.4.4. Risk Evaluation ........................................................................... .............................14 <br />5.5. Field Monitoring Program ................................................................... .............................15 <br />6. EVALUATION OF POTENTIAL SUBSIDENCE IMPACTS TO WATER WELLS ...............16 <br />6.1. Local Hydrology ................... ............................... ................16 <br />............. ............................... <br />6.2. Coal Mine Roof Collapse and Near Seam Effects on Hydrology ........ .............................16 <br />6.3. Prior Experience_ .............................................................................. _ .......................... 16 <br />6.4. Predicted Worst Case Effects ............................................................. .............................17 <br />6.5. Proposed Monitoring Requirements ................................................... .............................17 <br />7. CONCLUSIONS AND RECOMMENDATIONS ...................................... .............................18 <br />7.1. Union Pacific Railroad Energy Spur ................................................... .............................18 <br />7.2. Fish Creek and Foldei Creek .............................................................. .............................18 <br />7.3. Power Transmission Lines... .................................................................. ........................ 16 <br />7.4. Water Wells ........................................................................................ .............................19 <br />7.5. Monitoring Requirements ................................................................... .............................19 <br />Figure <br />No. <br />List of Figures <br />Description <br />1 General Vertical Stress Change and Displacement during Longwall Mining. <br />2 Maximum Subsidence vs Width /Depth for Wadge Seam Case Studies and Wolf <br />Creek Seam Predictions, <br />3 Transverse Subsidence Profile for 1,000 -feet deep Panels. <br />4 Transverse Subsidence Profile for 1,400 -feet deep Panels. <br />5 Transverse Subsidence Profile for 1,800 -feet deep Panels. <br />6 Predicted Subsidence along the Energy Spur. <br />7 Fish Creek Bottom Profile. <br />8 Predicted Subsidence along the Foidel Creek - Steamboat Line <br />9 Travelling Subsidence at the Archer Hayden Line for 9 -Right after Retreating 1000 - <br />feet from the Start Room. <br />i i P N : 2013 -26 <br />