2016-02-25_PERMIT FILE - C1982056A ‎(6)‎

• Permit No: C1982056A
• IBM Index Class Name: Permit File
• Doc Date: 2/25/2016
• Section_Exhibit Name: Exhibit 7K Wolf Creek Reserve Subsidence Evaluation
• Media Type: D
• Archive: Yes

SubTerra, Inc. Peabody Twentymile Coal, LLC 03/16/2015
Foidel Creek Mine
Permit Revision for Longwall Mining in the Wolf Creek Seam - Subsidence Evaluation
6.1. Scope of Work.................................................................................................................13
6.2. Approach.........................................................................................................................13
6.3. Subsidence Prediction.....................................................................................................13
6.3.1. Foidel Creek -Steamboat Transmission Line..............................................................13
6.3.2. Archer -Hayden and Craig -Hayden -Steamboat Transmission Lines .............................14
6.4. Power Line Subsidence...................................................................................................14
6.4.1. Clearance Issues.....................................................................................................14
6.4.2. Structure Tilt.............................................................................................................15
6.4.3. Differential Movements across the Structures..........................................................15
6.4.4. Risk Evaluation........................................................................................................15
6.5. Field Monitoring Program................................................................................................16
7. EVALUATION OF POTENTIAL SUBSIDENCE IMPACTS TO WATER WELLS ...............17
7.1. Local Hydrology..............................................................................................................17
7.2. Coal Mine Roof Collapse and Near Seam Effects on Hydrology.....................................17
7.3. Prior Experience..............................................................................................................17
7.4. Predicted Worst Case Effects..........................................................................................18
7.5. Proposed Monitoring Requirements................................................................................18
8. CONCLUSIONS AND RECOMMENDATIONS...................................................................19
8.1. Union Pacific Railroad Energy Spur................................................................................19
8.2. County Road 33..............................................................................................................19
8.3. Fish Creek, Foidel Creek, and Middle Creek...................................................................19
8.4. Power Transmission Lines..............................................................................................20
8.5. Water Wells.....................................................................................................................20
8.6. Monitoring Requirements................................................................................................20
ii PN: 2013-26