PERMFILE129236

• Permit No: C1982056
• IBM Index Class Name: Permit File
• Doc Date: 5/21/2004
• Section_Exhibit Name: Exhibit 07e-7 19 Right Powerline Study Final Report
• Media Type: D
• Archive: No

SubTerra, Inc. Twentymile Coal Company 6119/2003
19-Right Power Line Study
• Archer-Havden and Craip-Havden-Steamboat Power Line Undermining by 19 Right
Table of Contents
Section Description Page
No. No.
1. Introduction ..........................................................................................................................1
1.1 Scope of Work ..............................................................................................................1
1.2 Approach ......................................................................................................................1
2. Subsidence Prediction .........................................................................................................1
3. Power Line Subsidence .......................................................................................................2
3.1 Clearance Issues ..........................................................................................................2
3.2 Structure Tilt .................................................................................................................2
3.3 Differential Movements Across the Structures ..............................................................3
3.4 Risk Evaluation .............................................................................................................3
4. Field Monitoring Program .....................................................................................................3
• 5. Conclusions and Recommendations ....................................................................................4
•