PERMFILE131380

• Permit No: C1981041A
• IBM Index Class Name: Permit File
• Doc Date: 6/16/2003
• Doc Name: TOC to Appendix 20-3
• Section_Exhibit Name: Tab 20 Subsidence Survey Monitoring & Control Plan
• Media Type: D
• Archive: Yes

iii

• TABLE OF CONTENTS

Summary .............................................................................................. ii
... Introduction» ....................................................................................... I
Strength of Cameo "B" Coal Seam» ......................».»......................». 2
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Pillar Strength - Ponel "C" .................................................................
6
' Pillar Design - Ute Water Co. Area ................................................... I I
Pillar Design - 2nd East Section ..............».......................................» IS
Potential Subsidence Effects ............................................................... 19
Conclusions and Recommendations ...................................................... 23
Appendix A, Test Results ................................................................... 24
Appendix B, Physical Test Results - Western Coals ........................... 28
Appendix C, Confined Core Pillar Loadinq Analysis .......................... 29
•
Appendix D, Loan Transfer Data ....................................................... 36
Appendix E, Subsidence Tolerances .................................................... 39
References .......................................................................»............... 44