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n <br /> <br />• <br />H1.0 Introduction <br />This report is an Addendum to the "1997/98 Landslide Corrective Measures Report", Barr Engineering <br />Company, September 1998. This addendum, entitled "Appendix H" presents updated information on the <br />present and future predicted stability of the landslide at the main facilities of the West Elk Mine as <br />committed to in Technical Revision No. 84. The current analysis is based upon monitoring of historic and <br />present conditions at the site, engineering analysis of slope stability, and engineering interpretation of this <br />data through June 1999. The report will present an updated characterization of the landslide, an overview <br />of the corrective measures implemented to date, the results of stability analyses evaluating the effectivness <br />of the in-place the corrective measures, and a summary of monitoring information. <br />Mountain Coal Company is using the "Observa/io/talApproach" to landslide stabilization, wherein [he <br />implementation of corrective measures is based upon monitoring information and the performance of <br />in-place corrective measures. Ongoing corrective measures are scheduled for the remainder of 1999. <br />Future corrective measure plans can also be implemented if monitoring data and field conditions alert that <br />additional stabilization is needed. These ongoing and possible additional corrective measures are also <br />discussed in this addendum. <br />Barr Engineering Company <br />PCDOC81208220/CAK <br />July 31, 1999 <br />Appendix H <br />7999 Adtlentlum to <br />1997198 Landslide Corrective Measures Report <br />