2024-03-25_REVISION - M1982121 - Laserfiche WebLink

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Division: It was observed that the resulting FOS from multiple scenarios discussed in the Report were not provided in the text of the Report.Additionally, it was also observed that some of the associated models were not provided in the Report for the Divisions review. The resulting FOS and associated models for all scenarios discussed within the Report need to be provided within the associated Section and/or appendices. Please have KUE provide an updated Report including all resulting FOS within the discussions along with all associated models results. The following scenarios were not provided: o FOS result for bench slope geometry of 1.67:1 with reduced limestone cohesion (1,500 psf} under static conditions within discussion of Section 6 of the Report. o FOS result for bench slope geometries of 1:1, 1.4:1, and 1.67:1 with reduced cohesion (1,500 psf} under seismic conditions within discussion of Section 6 of the Report. o Model result for bench slope geometries of 1:1, 1.4:1, and 1.67:1 with reduced cohesion (1,500 psf} under static conditions within Appendix D of the Report. o Model result for bench slope geometry of 1.67:1 with reduced cohesion (1,500 psf} under seismic conditions within Appendix D of the Report. KUE:FOS results added to Table 6. Model runs added to Appendix D. After reviewing the updated Table 6 and Appendix D,all requested modeling and resulting FOS have been provided in the Report. This item has been satisfied and the Division has no further comments. • Division:Per Section 30 of the Policies of the Mined Land Reclamation Board,for generalized, assumed, or single test measurements for critical structures, the minimum recommended FOS is 1.5 for static conditions and 1.3 for seismic conditions. No seismic conditions were provided or evaluated by KUE in the Report. In order to ensure all requirements of Section 30 are satisfied, please have KUE provide stability analyses for the Mine under seismic conditions for all active mining and post-mining scenarios under KUE recommendations. KUE:Long term steady state models for multiple bench geometries and active stabilization models have been run for both static and seismic and are included in Appendix D and G, respectively. Division:After reviewing the updated Report and associated appendices, all provided stability analyses have met or exceeded the minimum requirements of Section 30 under static and seismic conditions. However, as discussed earlier in this Memo, not all FOS for every scenario discussed in the Report were provided in the discussions as well as some models not provided under the associated appendix. Please refer to the `Division's Comments and/or Questions"Section found at the end this Memo for specific scenarios that were not included in either the discussion within the Report or associated appendices for the Division's review. As discussed in the earlier adequacy item,KUE has provided all requested modeling and resulting FOS within the Report under Table 6 and Appendix D. Per Section 30 of the Policies of the Mined Land Reclamation Board(Section 30), for generalized, assumed, or single test measurements for critical structures,the minimum recommended FOS is 1.5 for static conditions and 1.3 for seismic conditions. All slope stability scenarios requested by the Division and provided within the Report have met or exceeded the minimum requirements of Section 30. This item has been satisfied and the Division has no further comments. • Division: When reviewing the associated stability analysis with mechanical stabilization under Appendix G, it was observed that none of the scenarios provided met the minimum FOS of 1.5 as stated in the Report. Per Section 8.1 of the Report, `[p]otential slope heights... Mid Continent Limestone Quarry Geotechnical Review Memo March 25,2024