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COLORADO <br /> Division of Reclamation, <br /> Mining and Safety <br /> Department of natural Resources <br /> Date: February 6, 2024 <br /> To: Amy Yeldell <br /> CC: Russ Means <br /> Travis Marshall <br /> Amy Eschberger <br /> From: Zach Trujillo <br /> RE: Mid Continent Limestone Quarry, DRMS File No. M-1982-121 <br /> Rock Failure Analysis and Stability Report Review <br /> Amy, <br /> As requested I have reviewed the provided geotechnical report, 'Rock Failure Analysis and Stability" <br /> (Report),conducted by Kilduff Underground Engineering, Inc. (KUE)on behalf of RMR Aggregates,Inc. <br /> (RMR)regarding the rock failure event that occurred on January 18, 2023 at the Mid Continent <br /> Limestone Quarry(Mine). This memo specifically addresses the updates to the Report along with the <br /> response to the Division's memo dated September 29, 2023 (2023 Memo) as provided under Technical <br /> Revision No. 6(TR-6). For more information regarding the Division's initial review of the Report,please <br /> refer to the Division's 2023 Memo. Questions and comments regarding the Report to ensure all Rules and <br /> requirements are satisfied will be summarized at the end of this memo. <br /> Division's Comments and/or Questions—2023 Memo <br /> The following is a summary of the Division's comments/questions discussed and observed during the <br /> 2023 Memo along with KUE's response provided within TR-6: <br /> Reconnaissance Findings <br /> • Division:In the Report,KUE references borehole logs conducted by Colorado Fuel& Iron in <br /> comparison to so theirsite reconnaissance. The referenced borehole logs were not included <br /> within the Report and theDivision has no records of the mentioned logs.Please have RMR or <br /> KUEprovide the borehole logs conducted by CFI for the Division's review and record. <br /> KUE: The relevant borehole logs have been attached to the report within Appendix B. <br /> After reviewing proposed Appendix B provided in the Report under TR-6,the borehole logs conducted by <br /> CFI have been provided for the Division's review and record. After review,the borehole logs are <br /> consistent to the information discussed of the borehole logs in the Report.The Division has no additional <br /> comment and this Item has been satisfied. <br /> Mid Cortienent Limestone Quarry Geotechnical Review Memo February 6,2024 <br /> 4F COlO <br /> �F = <br /> I H <br /> 1313 Sherman Street,Room215,Denver,CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br /> Jared S. Polis, Governor I Dan Gibbs, Executive Director I Virginia Brannon,Director <br /> �1876� <br />