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WL D UFF RMR Aggregates, Inc. <br /> U N ❑ E R G R 0 U N C Rock Failure Analyses and Stabilization Report <br /> E NGIN E E R I N G,INC Mid Continent Limestone Quarry <br /> August 29, 2023 <br /> RMR Aggregates, Inc. <br /> 6200 S. Syracuse Way, Ste. 450 <br /> Greenwood Village, CO 80111 <br /> Attention: Mr. Robert Wagner <br /> Re: Rock Failure Analyses and Stabilization <br /> Mid Continent Limestone Quarry <br /> Glenwood Springs, CO <br /> KUE Project No. P-23018SS <br /> Dear Mr. Wagner, <br /> Kilduff Underground Engineering, Inc. (KUE) is pleased to submit this report on the 2023 ground <br /> event analyses and headwall stabilization at the Mid Continent Limestone Quarry in Glenwood <br /> Springs, Colorado. KUE's services were performed in accordance with our contract between KUE and <br /> Rocky Mountain Industrials dated March 24, 2023. <br /> This report consists of a summary of findings from three site reconnaissance, kinematic and steady <br /> state stability analyses of both the West and East face, and rockfall modeling.The scope of work was <br /> performed to evaluate the failure mode of the January 2023 ground event to assess the long-term <br /> stability of the overall headwall and determine the best path forward for long-term slope stability. <br /> Data and recommendations are subject to the provisions and requirements outlined in the <br /> Limitations section of this report. <br /> We trust that our findings and recommendations outlined in this report will be responsive to your <br /> needs at this time. We thank you for this opportunity to be of service to you and your team on this <br /> exciting and interesting project. Should you have any questions or require additional information, <br /> please do not hesitate to contact the undersigned. <br /> Sincerely, <br /> � Li <br /> KILDUFF UNDERGROUND ENGINEERING, INC. °M' <br /> 46611 <br /> N. <br /> Sean Sundermann, PG, CEG Todd Kilduff, PE <br /> Principal Engineering Geologist Principal Engineer <br /> Page i <br /> 535 16th STREET,SUITE 620 1 DENVER,CO 80202 1 (303)732-3692 1 WWW.KILDUFFUNDERGROUND.COM <br />