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Mr. Chris Oestreich <br /> May12,2023 <br /> Page 5 <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 mine limit. <br /> Please call with any questions or comments. <br /> Sincerely, <br /> Civil Resources,LLC <br /> J <br /> —eiv �Z <br /> Gary Linden, P.G. <br /> Senior Engineering Geologist <br /> Attachments: <br /> Attachment A Tetra Tech RMC Stability Analyses,March 21,2003 <br /> Attachment B U.S.G.S. Uniform Hazard Tool Earthquake Acceleration and Galena Model Outputs <br /> REFERENCES <br /> Colton, R.B., 1978,'Geologic Map of the Boulder-Fort Collins-Greeley Area,Colorado,"U.S.G.S.Map 1-855G. <br /> Smith, Schneider,and Petri,'Groundwater,South Platte River Basin,"U.S.G.S.Water Supply Paper 1658. <br /> Terracon,2000,'Geotechnical Engineering Report,Gravel Exploration East 18th Street,Greeley,Colorado,"Terracon <br /> Project No.21995159. <br /> J:1Besbvay-213hissenISfabiitylReporhStabk analysis-Nissen Charge of Operator.doc <br />