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West Elk <br />• Contents (Continued) <br />C~ <br />• <br />Coal Seams and Related Strata ................................. .............. 2.04-22 <br />B-Seam ..................................................................... .............. 2.04-22 <br />E-Seam .................................................................. ..............2.04-27 <br />F-Seam .................................................................. ..............2.04-32 <br />Structural Geology .................................................................... ..............2.04-33 <br />Geologic Surface Features ........................................................ ..............2.04-34 <br />Prominent Fracture Zones ........................................ .............. 2.04-34 <br />Weathering and Burn ................................................ .............. 2.04-36 <br />Effects of Slopes ....................................................... .............. 2.04-36 <br />Steep Topography ..................................................... .............. 2.04-36 <br />Geologic Hazards and Slope Stability ...................................... .............. 2.04-37 <br />Landslides ................................................................. .............. 2.04-38 <br />Deep Landslides ....................................................... .............. 2.04-38 <br />Shallow Colluvial Slides .......................................... .............. 2.04-42 <br />Debris Avalanches .................................................... .............. 2.04-42 <br />Debris Flows ............................................................. .............. 2.04-42 <br />Potentially Unstable Slopes ...................................... .............. 2.04-43 <br />Rockfall .................................................................... .............. 2.04-43 <br />Seismic Effects ........................................................ ...............2.04-44 <br />Ground Subsidence .................................................. ............... 2.04-44 <br />Other Geologic Factors that May Affect Mining Conditions .. ............... 2.04-44 <br />Groundwater ............................................................ ............... 2.04-44 <br />Sandstone Channel Deposits ................................... ............... 2.04-48 <br />Rolls ......................................................................... ............... 2.04-48 <br />Rock Spars ............................................................... ............... 2.04-48 <br />Seam Discontinuities ............................................... ............... 2.04-48 <br />Soft Shales ............................................................... ............... 2.04-49 <br />Methane ................................................................... ............... 2.04-49 <br />2.04.7 Hydrology Description ............................................................. ............... 2.04-51 <br />2.04.7(1) Groundwater Information ......................................... ...............2.04-51 <br />Regional Groundwater Conditions .......................... ............... 2.04-53 <br />Site Hydrogeology ................................................... ............... 2.04-57 <br />Baseline Monitoring Program ................................. ...............2.04-58 <br />2.04.7 (2) Surface Water Information ...................................... ............... 2.04-76 <br />Surface Water Resources ......................................... ............... 2.04-76 <br />Baseline Monitoring Program ................................. ............... 2.04-80 <br />Spring Monitoring ................................................... ............... 2.04-88 <br />Surface Water Quantity ........................................... ............... 2.04-93 <br />Streams ................................................................. ...............2.04-93 <br />Surface Water Quality ............................................. ............. 2.04-106 <br />2.04.7(3) Alternative Water Supply Information ..................... ............. 2.04-114 <br />2.04.8 Climatological Information ............................. ...........2.04-115 <br />Regional ........................................... ...........2.04-115 <br />111 Revised November 1004 PRIO <br />