2011-05-18_PERMIT FILE - C1981012 ‎(2)‎

• Permit No: C1981012
• IBM Index Class Name: Permit File
• Doc Date: 5/18/2011
• Doc Name: PROBABLE HYDROLOGIC CONSEQUENCES OF MINING
• Section_Exhibit Name: Exhibit 08.4 Probable Hydrologic Consequences of Mining on the Allen & Apache Coal Seams
• Media Type: D
• Archive: No

Probable Hydrologic Consequences New Elk Mine 1
TABLE OF CONTENTS
1 . INTRODUCTION ....................................................................................................... ..............................1
2. MINE HISTORY AND PLANNED OPERATION .................................................... ..............................1
3 .
14YDROGEOLOGIC SETTING ................................................................................. ..............................3
3.1 Geology .................................................................................................... ..............................3
3.2 Hydrogeology .......................................................................................... ..............................6
3.2.1 Alluvial Aquifer .......................................................................... ..............................7
3.2.2 Raton Aquifer ............................................................................ .............................11
3.2.3 Vermejo Aquifer ........................................................................ .............................13
4 .
SURFACE WATER HYDROLOGY ......................................................................... .............................13
4.1 Purgatoire River ...................................................................................... .............................13
4.2 Apache Canyon ....................................................................................... .............................15
4.3 Ciruela Canyon ....................................................................................... .............................16
4.4 Springs and Seeps ................................................................................... .............................16
5.
2010 HYDROLOGIC SUTDIES AT THE NEW ELK MINE .................................. .............................17
5.1 Monitoring Well Installation ................................................................... .............................17
5.2 Packer Permeability Testing ................................................................... .............................17
6.
WATER LEVELS AND WATER QUALITY IN THE FLOODED NEW ELK MINE ........................23
7.
SUBSIDENCE PREDICTIONS FOR MINING OF THE ALLEN AND APACHE COAL SEAMS ...24
8. PROBABLE HYDROLOGIC IMPACTS OF MINING IN THE APACHE AND ALLEN COAL
SEAMS ..................................................................................................................... ............................... 27
9. REFERENCES ........................................................................................................... .............................30
LIST OF APPENDICES
Appendix A Well Completion Diagrams
Appendix B Packer Testing Data
4164A.110421 Whetstone Associates •
TD c,< QtAl D— 110 n 1101 1