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Mr. Phillip Courtney <br /> February 15, 2023 <br /> Page 6 <br /> LIMITATIONS <br /> Our review is based on regional geologic mapping, present mining plans, and borehole data by others. Stability <br /> analyses were performed using typical strength parameters for the various strata in the critical sections. Should the <br /> mining plans change or subsurface conditions vary from those portrayed in this letter, we should be contacted in order to <br /> re-evaluate the potential affects on permanent man-made structures. Stability analyses were run at the structure in <br /> question and were not on failure surfaces closer to the highwall. Note also that surcharge loads due to temporary <br /> material stockpiles and overburden berms were not considered in the analysis. <br /> Please call with any questions or comments. <br /> Sincerely, <br /> Civil Resources, LLC <br /> Gary Linden, P.G. <br /> Senior Engineering Geologist <br /> Attachments: <br /> U.S.G.S. Uniform Hazard Tool Earthquake Acceleration <br /> Galena Model Outputs: Sections 1, 2 and 3 <br /> J:\Martin Marietta-310\310.004 Thunderbird Pueblo County\S tab ility Analysis\Report\Updated Stability analysis-Thu nderbird.doc <br />