2024-02-02_REVISION - M1982121 (4)

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KiLDUFF RMR Aggregates, Inc. U N D E R G R D U N D Revisions Table-Rock Failure Analyses and Stabilization Report E N G I N E E R I N G.I N C Mid Continent Limestone Quarry November 29, 2023 RMR Aggregates, Inc. 6200 S. Syracuse Way, Ste.450 Greenwood Village, CO 80111 Attention: Mr. Robert Wagner Re: Response to Revision Request Rock Failure Analyses and Stabilization Mid Continent Limestone Quarry Glenwood Springs, CO KUE Project No. P-23018SS Dear Mr. Wagner, The Kilduff Underground Engineering, Inc. (KUE) consultant report dated August 29, 2023 and titled Rock Failure Analysis and Stability following was issued by RMR Aggregates, Inc.to the Colorado Division of Reclamation, mining and Safety (DRMS) on September 1, 2023. A review of the report and requested revisions were prepared by CO DRMS Environmental Protection Specialist Zach Trujillo in a report dated September 29, 2023.The following table lists the requested revisions/comments/questions and the response or action taken by KUE. Sect. No. Requested Revision KUE Action or Response 1) In the Report, KUE references borehole logs The relevant borehole logs have conducted by Colorado Fuel &Iron in been attached to the report within comparison to so their site reconnaissance. The Appendix B. referenced borehole logs were not included within the Report and the Division has no records of the mentioned logs. Please have RMR r� or KUE provide the borehole logs conducted by CFI for the Division's review and record. 2) It is unclear to the Division which material KUE has clarified throughout the strength properties were used in the stability report that the models were run analyses between the empirical values or post- using the established empirical backanalysis values found under Table 2. Please values that were corroborated by have KUE provide the Division with clarification the backanalysis. on which material strength properties values w reported in Table 2 were used within the stability analyses found within Appendix D. 3) Similarly to the comment above, it is unclear to KUE has clarified throughout the the Division which material strength properties report that the models were run . were used in the stability analyses under KUE's using the established empirical recommendations. Please have KUE provide the values that were corroborated by Division with clarification on which material the backanalysis.Appendix G w strength properties values reported in Table 2 � o values for joint strength and other were used within the stability analyses found joint parameters that dictate within Appendix D and Appendix G stabilization are included in Appendix G.