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<br />u <br />`J <br />iii iiiiiiiiiiiiiiii <br />sss <br />APPENDIX H <br />Doc Date:12/11/2001 <br />1999 ADDENDUM TO <br />Mountain Coal Company, L.L.C., West Elk Mine <br />1997/98 Landslide Corrective Measures Report <br />Table of Contents <br />H 1.0 Introduction .........................................................................................................................................1 <br />H2.0 Characterization of Landslide ..............................................................................................................2 <br />H3.0 Corrective Measures ............................................................................................................................9 <br />H3.1 Update of Existing In-Place Corrective Measures ........................................................................ I 1 <br />H3.2 On Going and Potential Corrective Measures ..............................................................................12 <br />H4.0 Analyses of Corrective Measures ............................................................... ........................................14 <br />H4.1 Groundwater Analyses ......................................................................... ........................................14 <br />H4.2 Limit Equilibrium Slope Stability Analyses ......................................... ........................................14 <br />H4.3 Pin (Micro-Pile Analyses) .................................................................... ........................................15 <br />H4.4 RCC Buttress ........................................................................................ ........................................15 <br />H5.0 Summary of Selected Monitoring Information ......................................... .........................................16 <br />H5.1 Surface Monitoring Points ................................................................... .........................................16 <br />H5.2 Piezometers ......................................................................................... ......................................... l7 <br />H5.3 Inclinometers ....................................................................................... ......................................... l 8 <br />H5.4 Stone Columns .................................................................................... .........................................19 <br />H5.5 Load Cells on RCC Buttress ............................................................... .........................................20 <br />H6.0 Discussion of Stability for Existing Conditions ................................................................................21 <br />H7.0 Discussion of Stability for Long-Term Conditions Based on Current Conditions to June 30, 1999..22 <br />H7.1 Validity of Models .......................................................................................................................22 <br />H7.2 Risk Analysis and the Probability of future Landslide Outcomes ................................................23 <br />H7.3 Fu[ure Monitoring ........................................................................................................................28 <br />Barr Enpineerinp Company <br />PCDOCS1208220/CAK <br />July 31, 1999 <br />i Appendix H <br />1999 Addendum to <br />1997198 Landslide Corrective Measures Report <br />