2024-01-22_PERMIT FILE - C1980007

• Permit No: C1980007
• IBM Index Class Name: Permit File
• Doc Date: 1/22/2024
• Section_Exhibit Name: Master Table of Contents
• Media Type: D
• Archive: No

West Elk Mine

Rev .03/06, 04/06 & 05/06- PR10; 09/07 & 02/08- PR12; 04/09- TR117; 08/09- TR118; 08/09- TR119; 01/10- TR120; 07/10- TR121; 08/18-
PR15; TR148- 10/20
Coal Seams and Related Strata ........................................... 2.04-22
B-Seam ................................................................................... 2.04-22
E-Seam ................................................................................ 2.04-27
F-Seam ................................................................................ 2.04-32
Structural Geology ................................................................................ 2.04-33
Geologic Surface Features .................................................................... 2.04-34
Prominent Fracture Zones .................................................. 2.04-34
Weathering and Burn .......................................................... 2.04-36
Effects of Slopes .................................................................... 2.04-36
Steep Topography ................................................................. 2.04-36
Geologic Hazards and Slope Stability ................................................. 2.04-37
Landslides .............................................................................. 2.04-38
Deep Landslides .................................................................... 2.04-38
Shallow Colluvial Slides ....................................................... 2.04-42
Debris Avalanches ................................................................ 2.04-42
Debris Flows .......................................................................... 2.04-42
Potentially Unstable Slopes .................................................. 2.04-43
Rockfall .................................................................................. 2.04-43
Seismic Effects ...................................................................... 2.04-44
Ground Subsidence .............................................................. 2.04-44
Other Geologic Factors that May Affect Mining Conditions ........... 2.04-44
Groundwater ......................................................................... 2.04-44
Sandstone Channel Deposits................................................ 2.04-48
Rolls ....................................................................................... 2.04-48
Rock Spars ............................................................................ 2.04-48
Seam Discontinuities ............................................................ 2.04-48
Soft Shales ............................................................................. 2.04-49
Methane ................................................................................. 2.04-49

2.04.7 Hydrology Description.......................................................................... 2.04-51
2.04.7(1) Groundwater Information .................................................... 2.04-51
Regional Groundwater Conditions ..................................... 2.04-53
Site Hydrogeology ................................................................. 2.04-58
Baseline Monitoring Program ............................................. 2.04-59
2.04.7 (2) Surface Water Information ................................................. 2.04-78
Surface Water Resources ..................................................... 2.04-78
Baseline Monitoring Program ............................................. 2.04-83
Spring Monitoring ................................................................ 2.04-87
Surface Water Quantity ....................................................... 2.04-92
Streams ................................................................................ 2.04-92
Surface Water Quality ....................................................... 2.04-105
2.04.7(3) Alternative Water Supply Information ............................. 2.04-114

Table of Contents (Continued)