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Mountain Coal <br />West Elk Mine <br />1997/98 Landslide Corrective Measures <br />Table of Contents <br />1.0 Introduction ............................................................. 1 <br />2.0 Characterization of Landslide ................................................ 2 <br />3.0 Corrective Measures ....................................................... 3 <br />3.1 Existing In-Place Corrective Measures ....................................... 3 <br />3.2 Potential Corrective Measures ............................................. 5 <br />4.0 Analyses of Corrective Measures ........ ~ ...................................... 7 <br />4.1 Groundwater Analyses ................................................... 7 <br />4.2 Limit Equilibrium Slope Stability Analyses ................................... 7 <br />4.3 Pin (Micro-Pile Analyses) ................................................. 8 <br />4.4 RCC Buttress ......................................................... 9 <br />4.5 Summary ............................................................. 9 <br />5.0 Summary of Selected Monitoring Information ................................... 10 <br />5.1 Monitoring Points ..................................................... 10 <br />• 5.2 Piezometers .... ' ...................................................... 10 <br />5.3 Inclinometers ......................................................... 11 <br />5.4 Inclinometers in Pins (Micro-Piles) ........................................ ^1l <br />5.5 Stone Columns ........................................................ 11 <br />5.6 Piezometers Near Dewatering Wells ....................................... 12 <br />5.7 Load Cells on RCC Buttress ............................................. 12 <br />6.0 Discussion of Stability for Existing Conditions .................................. 13 <br />7.0 Discussion of Stability for Long-Term Conditions (Post-Reclamation) ................. 14 <br />~•. <br />~. <br />• <br />0626024\68991-LABM <br />